Quarterly report pursuant to Section 13 or 15(d)

LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Stated at Face Amount, Net of Deferred Fees and Costs) (Details)

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Stated at Face Amount, Net of Deferred Fees and Costs) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net $ 6,898,729 $ 6,307,060 $ 6,148,918
Loans receivable, deferred fees and costs 335 1,800  
Construction and Land Development      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 841,738 751,131 776,430
Commercial Real Estate - Owner Occupied      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 903,523 857,805 857,142
Commercial Real Estate - Non-Owner Occupied      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 1,748,039 1,564,295 1,454,828
Multifamily Real Estate      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 368,686 334,276 339,313
Commercial & Industrial      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 554,522 551,526 509,857
Residential 1-4 Family      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 1,083,112 1,029,547 999,361
Auto      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 276,572 262,071 255,188
HELOC      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 535,446 526,884 524,097
Consumer and all other      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net $ 587,091 $ 429,525 $ 432,702