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, 2017
Dec. 31, 2016
Dec. 31, 2015
Loans and Leases Receivable Disclosure [Abstract]      
Loans receivable, deferred fees and costs $ 1,300 $ 1,800  
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 7,141,552 6,307,060 $ 5,671,462
Construction and Land Development      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 948,791 751,131 749,720
Commercial Real Estate - Owner Occupied      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 943,933 857,805 860,086
Commercial Real Estate - Non-Owner Occupied      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 1,713,659 1,564,295 1,270,480
Multifamily Real Estate      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 357,079 334,276 322,528
Commercial and Industrial      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 612,023 551,526 435,365
Residential 1-4 Family - Commercial      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 612,395 551,636 517,063
Residential 1-4 Family - Mortgage      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 485,690 477,911 461,406
Auto      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 282,474 262,071 234,061
HELOC      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs 537,521 526,884 516,726
Consumer and all other      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment, net of deferred fees and costs $ 647,987 $ 429,525 $ 304,027