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
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net $ 6,771,490 $ 6,307,060 $ 5,941,098
Loans receivable, deferred fees and costs 898 1,800  
Construction and Land Development      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 799,938 751,131 765,997
Commercial Real Estate - Owner Occupied      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 888,285 857,805 831,880
Commercial Real Estate - Non-Owner Occupied      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 1,698,329 1,564,295 1,370,745
Multifamily Real Estate      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 367,257 334,276 337,723
Commercial & Industrial      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 568,602 551,526 469,054
Residential 1-4 Family      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 1,066,519 1,029,547 992,457
Auto      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 274,162 262,071 244,575
HELOC      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 535,088 526,884 519,196
Consumer and all other      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net $ 573,310 $ 429,525 $ 409,471