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
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 6,554,046 $ 6,307,060 $ 5,780,502
Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 770,287 751,131 776,698
Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 870,559 857,805 849,202
Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,631,767 1,564,295 1,296,251
Multifamily Real Estate      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 353,769 334,276 323,270
Commercial & Industrial      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 576,567 551,526 453,208
Residential 1-4 Family      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,057,439 1,029,547 978,478
Auto      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 271,466 262,071 241,737
HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 527,863 526,884 517,122
Consumer and all other      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 494,329 429,525 $ 344,536
Excluding Purchased Impaired      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 6,496,276 6,247,768  
Excluding Purchased Impaired | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 6,259,544 6,017,055  
Excluding Purchased Impaired | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 191,595 198,078  
Excluding Purchased Impaired | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 41,255 28,617  
Excluding Purchased Impaired | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 3,882 4,018  
Excluding Purchased Impaired | Construction and Land Development      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 767,511 748,209  
Excluding Purchased Impaired | Construction and Land Development | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 684,967 667,018  
Excluding Purchased Impaired | Construction and Land Development | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 68,650 69,311  
Excluding Purchased Impaired | Construction and Land Development | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 13,803 11,857  
Excluding Purchased Impaired | Construction and Land Development | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 91 23  
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 852,360 839,462  
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 816,462 801,565  
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 30,379 32,364  
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 5,519 5,533  
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 0  
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,615,042 1,546,992  
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,571,645 1,505,153  
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 32,064 37,631  
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 11,333 4,208  
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 0  
Excluding Purchased Impaired | Multifamily Real Estate      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 351,711 332,210  
Excluding Purchased Impaired | Multifamily Real Estate | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 330,970 312,711  
Excluding Purchased Impaired | Multifamily Real Estate | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 20,741 19,499  
Excluding Purchased Impaired | Multifamily Real Estate | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 0  
Excluding Purchased Impaired | Multifamily Real Estate | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 0  
Excluding Purchased Impaired | Commercial & Industrial      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 575,834 550,452  
Excluding Purchased Impaired | Commercial & Industrial | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 560,889 539,999  
Excluding Purchased Impaired | Commercial & Industrial | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 10,158 9,391  
Excluding Purchased Impaired | Commercial & Industrial | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 4,787 1,062  
Excluding Purchased Impaired | Commercial & Industrial | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 0 0  
Excluding Purchased Impaired | Residential 1-4 Family      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,041,529 1,013,347  
Excluding Purchased Impaired | Residential 1-4 Family | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,012,281 986,973  
Excluding Purchased Impaired | Residential 1-4 Family | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 22,382 18,518  
Excluding Purchased Impaired | Residential 1-4 Family | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 4,323 4,813  
Excluding Purchased Impaired | Residential 1-4 Family | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 2,543 3,043  
Excluding Purchased Impaired | Auto      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 271,466 262,071  
Excluding Purchased Impaired | Auto | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 269,081 258,188  
Excluding Purchased Impaired | Auto | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 2,016 3,648  
Excluding Purchased Impaired | Auto | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 217 135  
Excluding Purchased Impaired | Auto | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 152 100  
Excluding Purchased Impaired | HELOC      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 526,707 525,723  
Excluding Purchased Impaired | HELOC | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 521,624 519,928  
Excluding Purchased Impaired | HELOC | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 2,996 4,225  
Excluding Purchased Impaired | HELOC | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 1,257 969  
Excluding Purchased Impaired | HELOC | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 830 601  
Excluding Purchased Impaired | Consumer and all other      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 494,116 429,302  
Excluding Purchased Impaired | Consumer and all other | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 491,625 425,520  
Excluding Purchased Impaired | Consumer and all other | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 2,209 3,491  
Excluding Purchased Impaired | Consumer and all other | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans 16 40  
Excluding Purchased Impaired | Consumer and all other | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Total Loans $ 266 $ 251