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LOANS - Credit Risk Profile of Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Financing Receivable, Recorded Investment [Line Items]      
Purchased Credit Impaired $ 11,702 $ 15,965  
Total loans held for investment 3,136,336 3,190,485 $ 3,012,275
Grade 1 - 4 (Pass)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 2,721,672 2,767,798  
Grade 5 (Watch)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 168,109 146,999  
Grade 6 (Special Mention)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 102,686 130,126  
Grade 7 (Substandard-Accrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 67,304 72,259  
Grade 8 (Substandard-Nonaccrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 64,863 57,338  
Grade 9 (Doubtful)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Commercial & industrial      
Financing Receivable, Recorded Investment [Line Items]      
Total loans held for investment 1,038,715 1,066,266  
Mortgage warehouse      
Financing Receivable, Recorded Investment [Line Items]      
Total loans held for investment 185,849 220,230  
Owner occupied commercial real estate      
Financing Receivable, Recorded Investment [Line Items]      
Total loans held for investment 435,366 415,230  
Commercial real estate      
Financing Receivable, Recorded Investment [Line Items]      
Total loans held for investment 1,068,832 1,067,779  
Construction, land & land development      
Financing Receivable, Recorded Investment [Line Items]      
Total loans held for investment 148,732 164,952  
Residential mortgage      
Financing Receivable, Recorded Investment [Line Items]      
Total loans held for investment 242,529 238,580  
Consumer and other      
Financing Receivable, Recorded Investment [Line Items]      
Total loans held for investment 16,313 17,448  
Originated      
Financing Receivable, Recorded Investment [Line Items]      
Purchased Credit Impaired 0 0  
Total loans held for investment 2,684,727 2,676,491 2,282,211
Originated | Grade 1 - 4 (Pass)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 2,386,516 2,382,372  
Originated | Grade 5 (Watch)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 111,280 78,394  
Originated | Grade 6 (Special Mention)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 67,542 98,694  
Originated | Grade 7 (Substandard-Accrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 59,210 65,171  
Originated | Grade 8 (Substandard-Nonaccrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 60,179 51,860  
Originated | Grade 9 (Doubtful)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Originated | Commercial & industrial      
Financing Receivable, Recorded Investment [Line Items]      
Purchased Credit Impaired 0 0  
Total loans held for investment 991,125 1,002,797 889,848
Originated | Commercial & industrial | Grade 1 - 4 (Pass)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 854,869 889,709  
Originated | Commercial & industrial | Grade 5 (Watch)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 46,230 22,648  
Originated | Commercial & industrial | Grade 6 (Special Mention)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 20,733 5,605  
Originated | Commercial & industrial | Grade 7 (Substandard-Accrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 15,850 39,422  
Originated | Commercial & industrial | Grade 8 (Substandard-Nonaccrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 53,443 45,413  
Originated | Commercial & industrial | Grade 9 (Doubtful)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Originated | Mortgage warehouse      
Financing Receivable, Recorded Investment [Line Items]      
Purchased Credit Impaired 0 0  
Total loans held for investment 185,849 220,230  
Originated | Mortgage warehouse | Grade 1 - 4 (Pass)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 185,849 220,230  
Originated | Mortgage warehouse | Grade 5 (Watch)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Originated | Mortgage warehouse | Grade 6 (Special Mention)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Originated | Mortgage warehouse | Grade 7 (Substandard-Accrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Originated | Mortgage warehouse | Grade 8 (Substandard-Nonaccrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Originated | Mortgage warehouse | Grade 9 (Doubtful)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Originated | Owner occupied commercial real estate      
Financing Receivable, Recorded Investment [Line Items]      
Purchased Credit Impaired 0 0  
Total loans held for investment 352,138 327,906 292,413
Originated | Owner occupied commercial real estate | Grade 1 - 4 (Pass)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 335,487 314,497  
Originated | Owner occupied commercial real estate | Grade 5 (Watch)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 7,791 3,096  
Originated | Owner occupied commercial real estate | Grade 6 (Special Mention)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 4,492 7,658  
Originated | Owner occupied commercial real estate | Grade 7 (Substandard-Accrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 4,368 2,655  
Originated | Owner occupied commercial real estate | Grade 8 (Substandard-Nonaccrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Originated | Owner occupied commercial real estate | Grade 9 (Doubtful)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Originated | Commercial real estate      
Financing Receivable, Recorded Investment [Line Items]      
Purchased Credit Impaired 0 0  
Total loans held for investment 861,687 823,361 809,026
Originated | Commercial real estate | Grade 1 - 4 (Pass)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 735,733 681,691  
Originated | Commercial real estate | Grade 5 (Watch)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 56,233 45,149  
Originated | Commercial real estate | Grade 6 (Special Mention)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 40,960 85,431  
Originated | Commercial real estate | Grade 7 (Substandard-Accrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 28,576 11,090  
Originated | Commercial real estate | Grade 8 (Substandard-Nonaccrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 185 0  
Originated | Commercial real estate | Grade 9 (Doubtful)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Originated | Construction, land & land development      
Financing Receivable, Recorded Investment [Line Items]      
Purchased Credit Impaired 0 0  
Total loans held for investment 122,274 136,998 151,114
Originated | Construction, land & land development | Grade 1 - 4 (Pass)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 107,957 121,893  
Originated | Construction, land & land development | Grade 5 (Watch)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 970  
Originated | Construction, land & land development | Grade 6 (Special Mention)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 1,357 0  
Originated | Construction, land & land development | Grade 7 (Substandard-Accrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 9,545 10,848  
Originated | Construction, land & land development | Grade 8 (Substandard-Nonaccrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 3,415 3,287  
Originated | Construction, land & land development | Grade 9 (Doubtful)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Originated | Residential mortgage      
Financing Receivable, Recorded Investment [Line Items]      
Purchased Credit Impaired 0 0  
Total loans held for investment 156,255 149,021 130,799
Originated | Residential mortgage | Grade 1 - 4 (Pass)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 151,273 138,239  
Originated | Residential mortgage | Grade 5 (Watch)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 1,026 6,529  
Originated | Residential mortgage | Grade 6 (Special Mention)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Originated | Residential mortgage | Grade 7 (Substandard-Accrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 867 1,142  
Originated | Residential mortgage | Grade 8 (Substandard-Nonaccrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 3,089 3,111  
Originated | Residential mortgage | Grade 9 (Doubtful)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Originated | Consumer and other      
Financing Receivable, Recorded Investment [Line Items]      
Purchased Credit Impaired 0 0  
Total loans held for investment 15,399 16,178 9,011
Originated | Consumer and other | Grade 1 - 4 (Pass)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 15,348 16,113  
Originated | Consumer and other | Grade 5 (Watch)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 2  
Originated | Consumer and other | Grade 6 (Special Mention)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Originated | Consumer and other | Grade 7 (Substandard-Accrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 4 14  
Originated | Consumer and other | Grade 8 (Substandard-Nonaccrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 47 49  
Originated | Consumer and other | Grade 9 (Doubtful)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Acquired      
Financing Receivable, Recorded Investment [Line Items]      
Purchased Credit Impaired 11,702 15,965  
Total loans held for investment 451,609 513,994 730,064
Acquired | Grade 1 - 4 (Pass)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 335,156 385,426  
Acquired | Grade 5 (Watch)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 56,829 68,605  
Acquired | Grade 6 (Special Mention)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 35,144 31,432  
Acquired | Grade 7 (Substandard-Accrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 8,094 7,088  
Acquired | Grade 8 (Substandard-Nonaccrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 4,684 5,478  
Acquired | Grade 9 (Doubtful)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Acquired | Commercial & industrial      
Financing Receivable, Recorded Investment [Line Items]      
Purchased Credit Impaired 2,161 3,237  
Total loans held for investment 47,590 63,469 123,134
Acquired | Commercial & industrial | Grade 1 - 4 (Pass)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 22,725 38,000  
Acquired | Commercial & industrial | Grade 5 (Watch)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 6,371 3,172  
Acquired | Commercial & industrial | Grade 6 (Special Mention)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 7,960 11,101  
Acquired | Commercial & industrial | Grade 7 (Substandard-Accrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 6,520 6,058  
Acquired | Commercial & industrial | Grade 8 (Substandard-Nonaccrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 1,853 1,901  
Acquired | Commercial & industrial | Grade 9 (Doubtful)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Acquired | Mortgage warehouse      
Financing Receivable, Recorded Investment [Line Items]      
Total loans held for investment 0 0  
Acquired | Owner occupied commercial real estate      
Financing Receivable, Recorded Investment [Line Items]      
Purchased Credit Impaired 3,751 4,062  
Total loans held for investment 83,228 87,324 123,182
Acquired | Owner occupied commercial real estate | Grade 1 - 4 (Pass)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 70,015 72,592  
Acquired | Owner occupied commercial real estate | Grade 5 (Watch)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 7,401 8,499  
Acquired | Owner occupied commercial real estate | Grade 6 (Special Mention)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Acquired | Owner occupied commercial real estate | Grade 7 (Substandard-Accrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 282 285  
Acquired | Owner occupied commercial real estate | Grade 8 (Substandard-Nonaccrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 1,779 1,886  
Acquired | Owner occupied commercial real estate | Grade 9 (Doubtful)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Acquired | Commercial real estate      
Financing Receivable, Recorded Investment [Line Items]      
Purchased Credit Impaired 3,611 6,437  
Total loans held for investment 207,145 244,418 320,005
Acquired | Commercial real estate | Grade 1 - 4 (Pass)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 145,492 173,765  
Acquired | Commercial real estate | Grade 5 (Watch)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 30,676 43,775  
Acquired | Commercial real estate | Grade 6 (Special Mention)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 26,984 20,129  
Acquired | Commercial real estate | Grade 7 (Substandard-Accrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 270 0  
Acquired | Commercial real estate | Grade 8 (Substandard-Nonaccrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 112 312  
Acquired | Commercial real estate | Grade 9 (Doubtful)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Acquired | Construction, land & land development      
Financing Receivable, Recorded Investment [Line Items]      
Purchased Credit Impaired 0 0  
Total loans held for investment 26,458 27,954 50,832
Acquired | Construction, land & land development | Grade 1 - 4 (Pass)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 13,107 14,549  
Acquired | Construction, land & land development | Grade 5 (Watch)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 12,087 12,136  
Acquired | Construction, land & land development | Grade 6 (Special Mention)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Acquired | Construction, land & land development | Grade 7 (Substandard-Accrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 555 555  
Acquired | Construction, land & land development | Grade 8 (Substandard-Nonaccrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 709 714  
Acquired | Construction, land & land development | Grade 9 (Doubtful)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Acquired | Residential mortgage      
Financing Receivable, Recorded Investment [Line Items]      
Purchased Credit Impaired 2,179 2,229  
Total loans held for investment 86,274 89,559 111,040
Acquired | Residential mortgage | Grade 1 - 4 (Pass)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 83,118 85,461  
Acquired | Residential mortgage | Grade 5 (Watch)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 294 1,023  
Acquired | Residential mortgage | Grade 6 (Special Mention)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 200 202  
Acquired | Residential mortgage | Grade 7 (Substandard-Accrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 467 190  
Acquired | Residential mortgage | Grade 8 (Substandard-Nonaccrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 16 454  
Acquired | Residential mortgage | Grade 9 (Doubtful)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Acquired | Consumer and other      
Financing Receivable, Recorded Investment [Line Items]      
Purchased Credit Impaired 0 0  
Total loans held for investment 914 1,270 $ 1,871
Acquired | Consumer and other | Grade 1 - 4 (Pass)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 699 1,059  
Acquired | Consumer and other | Grade 5 (Watch)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Acquired | Consumer and other | Grade 6 (Special Mention)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Acquired | Consumer and other | Grade 7 (Substandard-Accrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 0 0  
Acquired | Consumer and other | Grade 8 (Substandard-Nonaccrual)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile 215 211  
Acquired | Consumer and other | Grade 9 (Doubtful)      
Financing Receivable, Recorded Investment [Line Items]      
Loans, credit risk profile $ 0 $ 0