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
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net $ 6,554,046 $ 6,307,060 $ 5,780,502
Loans receivable, deferred fees and costs 768 1,800  
Construction and Land Development      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 770,287 751,131 776,698
Commercial Real Estate - Owner Occupied      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 870,559 857,805 849,202
Commercial Real Estate - Non-Owner Occupied      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 1,631,767 1,564,295 1,296,251
Multifamily Real Estate      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 353,769 334,276 323,270
Commercial & Industrial      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 576,567 551,526 453,208
Residential 1-4 Family      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 1,057,439 1,029,547 978,478
Auto      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 271,466 262,071 241,737
HELOC      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net 527,863 526,884 517,122
Consumer and all other      
Loans and Leases Receivable Disclosure [Line Items]      
Total loans held for investment, net $ 494,329 $ 429,525 $ 344,536