Annual report pursuant to Section 13 and 15(d)

LOANS AND ALLOWANCE FOR LOAN LOSSES (Purchased Impaired Commercial and Consumer Loan Portfolios by Class) (Details)

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Purchased Impaired Commercial and Consumer Loan Portfolios by Class) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current $ 6,209,924 $ 5,542,840  
Total Loans 6,307,060 5,671,462 $ 5,345,996
Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 55,244 64,455  
Total Loans 59,292 73,737 105,788
Construction and Land Development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 744,702 737,958  
Total Loans 751,131 749,720 656,380
Construction and Land Development | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 2,838 5,376  
Total Loans 2,922 5,986 11,890
Commercial Real Estate - Owner Occupied      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 836,682 826,859  
Total Loans 857,805 860,086 869,200
Commercial Real Estate - Owner Occupied | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 17,553 24,837  
Total Loans 18,343 27,388 31,167
Commercial Real Estate - Non-Owner Occupied      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 1,544,623 1,255,367  
Total Loans 1,564,295 1,270,480 1,183,514
Commercial Real Estate - Non-Owner Occupied | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 16,768 12,562  
Total Loans 17,303 13,519 25,834
Multifamily Real Estate      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 332,063 320,701  
Total Loans 334,276 322,528 297,366
Multifamily Real Estate | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 2,066 1,555  
Total Loans 2,066 1,555 2,994
Commercial and Industrial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 548,702 431,916  
Total Loans 551,526 435,365 374,096
Commercial and Industrial | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 974 1,583  
Total Loans 1,074 1,813 3,440
Residential 1-4 Family      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 998,448 928,312  
Total Loans 1,029,547 978,469 983,074
Residential 1-4 Family | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 13,957 17,093  
Total Loans 16,200 21,159 26,619
HELOC      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 520,833 509,124  
Total Loans 526,884 516,726 523,341
HELOC | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 865 923  
Total Loans 1,161 1,791 2,000
Consumer and all other      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 424,967 301,339  
Total Loans 429,525 304,027 251,212
Consumer and all other | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 223 526  
Total Loans 223 526 $ 1,844
30 To 89 Days Past Due | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 2,197 5,025  
30 To 89 Days Past Due | Construction and Land Development | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 0 369  
30 To 89 Days Past Due | Commercial Real Estate - Owner Occupied | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 271 1,139  
30 To 89 Days Past Due | Commercial Real Estate - Non-Owner Occupied | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 409 755  
30 To 89 Days Past Due | Multifamily Real Estate | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 0 0  
30 To 89 Days Past Due | Commercial and Industrial | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 44 209  
30 To 89 Days Past Due | Residential 1-4 Family | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,298 2,143  
30 To 89 Days Past Due | HELOC | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 175 410  
30 To 89 Days Past Due | Consumer and all other | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 0 0  
Greater Than 90 Days and still Accruing | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 1,851 4,257  
Greater Than 90 Days and still Accruing | Construction and Land Development | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 84 241  
Greater Than 90 Days and still Accruing | Commercial Real Estate - Owner Occupied | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 519 1,412  
Greater Than 90 Days and still Accruing | Commercial Real Estate - Non-Owner Occupied | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 126 202  
Greater Than 90 Days and still Accruing | Multifamily Real Estate | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 0 0  
Greater Than 90 Days and still Accruing | Commercial and Industrial | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 56 21  
Greater Than 90 Days and still Accruing | Residential 1-4 Family | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 945 1,923  
Greater Than 90 Days and still Accruing | HELOC | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due 121 458  
Greater Than 90 Days and still Accruing | Consumer and all other | Purchased Impaired      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due $ 0 $ 0