Annual report pursuant to Section 13 and 15(d)

LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Stated at Face Amount, Net of Unearned Income) (Details)

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Stated at Face Amount, Net of Unearned Income) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loans and Leases Receivable Disclosure [Abstract]      
Loans receivable, deferred fees and costs $ 1,800 $ 3,000  
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 6,307,060 5,671,462 $ 5,345,996
Construction and Land Development      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 751,131 749,720 656,380
Commercial Real Estate - Owner Occupied      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 857,805 860,086 869,200
Commercial Real Estate - Non-Owner Occupied      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 1,564,295 1,270,480 1,183,514
Multifamily Real Estate      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 334,276 322,528 297,366
Commercial and Industrial      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 551,526 435,365 374,096
Residential 1-4 Family      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 1,029,547 978,469 983,074
Auto      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 262,071 234,061 207,813
HELOC      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 526,884 516,726 523,341
Consumer and all other      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs $ 429,525 $ 304,027 $ 251,212