Quarterly report pursuant to Section 13 or 15(d)

LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Receivables Related Risk Rating Excluding Purchased Impaired Loans) (Details)

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Receivables Related Risk Rating Excluding Purchased Impaired Loans) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating $ 5,510,385 $ 5,345,996 $ 5,233,069
Commercial Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 378,204 341,280  
Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 874,582 875,443  
Commercial Real Estate - Non-Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 1,569,306 1,509,159  
Raw Land and Lots [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 201,630 211,225  
Single Family Investment Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 435,068 412,494  
Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 450,682 393,776  
Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 90,556 81,106  
Excluding Purchased Impaired [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 3,922,509 3,730,248  
Excluding Purchased Impaired [Member] | Commercial Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 375,283 337,498  
Excluding Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 844,744 844,276  
Excluding Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 1,549,290 1,480,290  
Excluding Purchased Impaired [Member] | Raw Land and Lots [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 196,527 203,798  
Excluding Purchased Impaired [Member] | Single Family Investment Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 419,564 395,615  
Excluding Purchased Impaired [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 447,657 389,921  
Excluding Purchased Impaired [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 89,444 78,850  
Excluding Purchased Impaired [Member] | 1-3 [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 944,887 805,908  
Excluding Purchased Impaired [Member] | 1-3 [Member] | Commercial Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 34,756 22,512  
Excluding Purchased Impaired [Member] | 1-3 [Member] | Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 183,155 185,789  
Excluding Purchased Impaired [Member] | 1-3 [Member] | Commercial Real Estate - Non-Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 407,562 356,263  
Excluding Purchased Impaired [Member] | 1-3 [Member] | Raw Land and Lots [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 11,696 11,162  
Excluding Purchased Impaired [Member] | 1-3 [Member] | Single Family Investment Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 66,052 59,638  
Excluding Purchased Impaired [Member] | 1-3 [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 195,917 138,973  
Excluding Purchased Impaired [Member] | 1-3 [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 45,749 31,571  
Excluding Purchased Impaired [Member] | 4 [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 2,757,857 2,662,344  
Excluding Purchased Impaired [Member] | 4 [Member] | Commercial Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 310,970 289,064  
Excluding Purchased Impaired [Member] | 4 [Member] | Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 629,284 620,587  
Excluding Purchased Impaired [Member] | 4 [Member] | Commercial Real Estate - Non-Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 1,081,215 1,041,515  
Excluding Purchased Impaired [Member] | 4 [Member] | Raw Land and Lots [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 132,386 128,281  
Excluding Purchased Impaired [Member] | 4 [Member] | Single Family Investment Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 333,533 311,900  
Excluding Purchased Impaired [Member] | 4 [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 231,994 230,084  
Excluding Purchased Impaired [Member] | 4 [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 38,475 40,913  
Excluding Purchased Impaired [Member] | 5 [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 86,878 89,056  
Excluding Purchased Impaired [Member] | 5 [Member] | Commercial Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 17,583 11,932  
Excluding Purchased Impaired [Member] | 5 [Member] | Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 14,460 15,003  
Excluding Purchased Impaired [Member] | 5 [Member] | Commercial Real Estate - Non-Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 22,487 22,358  
Excluding Purchased Impaired [Member] | 5 [Member] | Raw Land and Lots [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 9,814 16,803  
Excluding Purchased Impaired [Member] | 5 [Member] | Single Family Investment Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 8,794 9,750  
Excluding Purchased Impaired [Member] | 5 [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 10,823 9,392  
Excluding Purchased Impaired [Member] | 5 [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 2,917 3,818  
Excluding Purchased Impaired [Member] | 6 [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 68,116 63,672  
Excluding Purchased Impaired [Member] | 6 [Member] | Commercial Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 9,343 10,906  
Excluding Purchased Impaired [Member] | 6 [Member] | Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 6,471 7,688  
Excluding Purchased Impaired [Member] | 6 [Member] | Commercial Real Estate - Non-Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 24,523 28,388  
Excluding Purchased Impaired [Member] | 6 [Member] | Raw Land and Lots [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 16,359 4,783  
Excluding Purchased Impaired [Member] | 6 [Member] | Single Family Investment Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 6,190 6,680  
Excluding Purchased Impaired [Member] | 6 [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 4,319 4,383  
Excluding Purchased Impaired [Member] | 6 [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 911 844  
Excluding Purchased Impaired [Member] | 7 [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 63,189 109,268  
Excluding Purchased Impaired [Member] | 7 [Member] | Commercial Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 2,631 3,084  
Excluding Purchased Impaired [Member] | 7 [Member] | Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 9,792 15,209  
Excluding Purchased Impaired [Member] | 7 [Member] | Commercial Real Estate - Non-Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 13,503 31,766  
Excluding Purchased Impaired [Member] | 7 [Member] | Raw Land and Lots [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 26,272 42,769  
Excluding Purchased Impaired [Member] | 7 [Member] | Single Family Investment Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 4,995 7,647  
Excluding Purchased Impaired [Member] | 7 [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 4,604 7,089  
Excluding Purchased Impaired [Member] | 7 [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating 1,392 $ 1,704  
Excluding Purchased Impaired [Member] | 8 [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating $ 1,582    
Excluding Purchased Impaired [Member] | 8 [Member] | Commercial Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating      
Excluding Purchased Impaired [Member] | 8 [Member] | Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating $ 1,582    
Excluding Purchased Impaired [Member] | 8 [Member] | Commercial Real Estate - Non-Owner Occupied [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating      
Excluding Purchased Impaired [Member] | 8 [Member] | Raw Land and Lots [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating      
Excluding Purchased Impaired [Member] | 8 [Member] | Single Family Investment Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating      
Excluding Purchased Impaired [Member] | 8 [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating      
Excluding Purchased Impaired [Member] | 8 [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivables related risk rating