Annual report pursuant to Section 13 and 15(d)

LOANS AND ALLOWANCE FOR LOAN LOSSES (Summary of Aging of the Loan Portfolio by Class) (Details)

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Summary of Aging of the Loan Portfolio by Class) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Greater Than 90 Days and Still Accruing $ 3,005 $ 5,829  
Total Loans 6,307,060 5,671,462 $ 5,345,996
Nonaccrual 9,973 11,936 19,300
Current 6,209,924 5,542,840  
30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 20,245 27,787  
60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 4,621 9,333  
Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 59,292 73,737 105,788
Current 55,244 64,455  
Construction and Land Development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Greater Than 90 Days and Still Accruing 76 128  
Total Loans 751,131 749,720 656,380
Nonaccrual 2,037 2,113  
Current 744,702 737,958  
Construction and Land Development | 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,162 3,155  
Construction and Land Development | 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 232 380  
Construction and Land Development | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 2,922 5,986 11,890
Current 2,838 5,376  
Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Greater Than 90 Days and Still Accruing 35 103  
Total Loans 857,805 860,086 869,200
Nonaccrual 794 3,904  
Current 836,682 826,859  
Commercial Real Estate - Owner Occupied | 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,842 1,714  
Commercial Real Estate - Owner Occupied | 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 109 118  
Commercial Real Estate - Owner Occupied | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 18,343 27,388 31,167
Current 17,553 24,837  
Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Greater Than 90 Days and Still Accruing 0 723  
Total Loans 1,564,295 1,270,480 1,183,514
Nonaccrual 0 100  
Current 1,544,623 1,255,367  
Commercial Real Estate - Non-Owner Occupied | 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 2,369 771  
Commercial Real Estate - Non-Owner Occupied | 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 0 0  
Commercial Real Estate - Non-Owner Occupied | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 17,303 13,519 25,834
Current 16,768 12,562  
Multifamily Real Estate      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Greater Than 90 Days and Still Accruing 0 272  
Total Loans 334,276 322,528 297,366
Nonaccrual 0 0  
Current 332,063 320,701  
Multifamily Real Estate | 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 147 0  
Multifamily Real Estate | 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 0 0  
Multifamily Real Estate | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 2,066 1,555 2,994
Current 2,066 1,555  
Commercial and Industrial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Greater Than 90 Days and Still Accruing 9 124  
Total Loans 551,526 435,365 374,096
Nonaccrual 124 429  
Current 548,702 431,916  
Commercial and Industrial | 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 759 1,056  
Commercial and Industrial | 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 858 27  
Commercial and Industrial | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 1,074 1,813 3,440
Current 974 1,583  
Residential 1-4 Family      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Greater Than 90 Days and Still Accruing 2,048 3,638  
Total Loans 1,029,547 978,469 983,074
Nonaccrual 5,279 3,563  
Current 998,448 928,312  
Residential 1-4 Family | 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 7,038 15,023  
Residential 1-4 Family | 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 534 6,774  
Residential 1-4 Family | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 16,200 21,159 26,619
Current 13,957 17,093  
Auto      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Greater Than 90 Days and Still Accruing 111 60  
Total Loans 262,071 234,061 207,813
Nonaccrual 169 192  
Current 258,904 231,264  
Auto | 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 2,570 2,312  
Auto | 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 317 233  
Auto | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 0 0 0
HELOC      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Greater Than 90 Days and Still Accruing 635 762  
Total Loans 526,884 516,726 523,341
Nonaccrual 1,279 1,348  
Current 520,833 509,124  
HELOC | 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,836 2,589  
HELOC | 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,140 1,112  
HELOC | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 1,161 1,791 2,000
Current 865 923  
Consumer and all other      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Greater Than 90 Days and Still Accruing 91 19  
Total Loans 429,525 304,027 251,212
Nonaccrual 291 287  
Current 424,967 301,339  
Consumer and all other | 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 2,522 1,167  
Consumer and all other | 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,431 689  
Consumer and all other | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 223 526 $ 1,844
Current $ 223 $ 526