LOANS - Credit Quality (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Purchased credit impaired	$ 15,965	$ 25,188
Total loans held for investment	3,190,485	3,098,220
Grade 1 - 4 (Pass)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	2,767,798	2,657,301
Grade 5 (Watch)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	146,999	115,258
Grade 6 (Special Mention)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	130,126	150,593
Grade 7 (Substandard-Accrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	72,259	73,074
Grade 8 (Substandard-Nonaccrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	57,338	74,995
Grade 9 (Doubtful)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	0	1,811
Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	1,286,496	1,053,925
Owner occupied commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	415,230	394,210
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	1,067,779	1,143,751
Construction, land & land development
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	164,952	249,704
Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	238,580	245,191
Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	17,448	11,439
Originated
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	2,676,491	2,301,928
Originated | Grade 1 - 4 (Pass)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	2,382,372	2,081,325
Originated | Grade 5 (Watch)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	78,394	72,082
Originated | Grade 6 (Special Mention)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	98,694	82,438
Originated | Grade 7 (Substandard-Accrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	65,171	26,320
Originated | Grade 8 (Substandard-Nonaccrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	51,860	37,952
Originated | Grade 9 (Doubtful)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	0	1,811
Originated | Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	1,223,027	904,331
Originated | Commercial & industrial | Grade 1 - 4 (Pass)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,109,939	818,352
Originated | Commercial & industrial | Grade 5 (Watch)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	22,648	11,427
Originated | Commercial & industrial | Grade 6 (Special Mention)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	5,605	24,133
Originated | Commercial & industrial | Grade 7 (Substandard-Accrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	39,422	14,088
Originated | Commercial & industrial | Grade 8 (Substandard-Nonaccrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	45,413	34,520
Originated | Commercial & industrial | Grade 9 (Doubtful)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	0	1,811
Originated | Owner occupied commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	327,906	264,876
Originated | Owner occupied commercial real estate | Grade 1 - 4 (Pass)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	314,497	247,868
Originated | Owner occupied commercial real estate | Grade 5 (Watch)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	3,096	13,169
Originated | Owner occupied commercial real estate | Grade 6 (Special Mention)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	7,658	513
Originated | Owner occupied commercial real estate | Grade 7 (Substandard-Accrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	2,655	3,326
Originated | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	823,361	816,029
Originated | Commercial real estate | Grade 1 - 4 (Pass)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	681,691	716,744
Originated | Commercial real estate | Grade 5 (Watch)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	45,149	35,812
Originated | Commercial real estate | Grade 6 (Special Mention)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	85,431	55,230
Originated | Commercial real estate | Grade 7 (Substandard-Accrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	11,090	6,184
Originated | Commercial real estate | Grade 8 (Substandard-Nonaccrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile		2,059
Originated | Construction, land & land development
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	136,998	179,999
Originated | Construction, land & land development | Grade 1 - 4 (Pass)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	121,893	171,287
Originated | Construction, land & land development | Grade 5 (Watch)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	970	5,590
Originated | Construction, land & land development | Grade 6 (Special Mention)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile		1,931
Originated | Construction, land & land development | Grade 7 (Substandard-Accrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	10,848	1,191
Originated | Construction, land & land development | Grade 8 (Substandard-Nonaccrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	3,287
Originated | Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	149,021	127,445
Originated | Residential mortgage | Grade 1 - 4 (Pass)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	138,239	118,042
Originated | Residential mortgage | Grade 5 (Watch)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	6,529	6,079
Originated | Residential mortgage | Grade 6 (Special Mention)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile		573
Originated | Residential mortgage | Grade 7 (Substandard-Accrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,142	1,497
Originated | Residential mortgage | Grade 8 (Substandard-Nonaccrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	3,111	1,254
Originated | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	16,178	9,248
Originated | Consumer and other | Grade 1 - 4 (Pass)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	16,113	9,032
Originated | Consumer and other | Grade 5 (Watch)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	2	5
Originated | Consumer and other | Grade 6 (Special Mention)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile		58
Originated | Consumer and other | Grade 7 (Substandard-Accrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	14	34
Originated | Consumer and other | Grade 8 (Substandard-Nonaccrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	49	119
Acquired
Financing Receivable, Recorded Investment [Line Items]
Purchased credit impaired	15,965	25,188
Total loans held for investment	513,994	796,292
Acquired | Grade 1 - 4 (Pass)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	385,426	575,976
Acquired | Grade 5 (Watch)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	68,605	43,176
Acquired | Grade 6 (Special Mention)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	31,432	68,155
Acquired | Grade 7 (Substandard-Accrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	7,088	46,754
Acquired | Grade 8 (Substandard-Nonaccrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	5,478	37,043
Acquired | Commercial & industrial
Financing Receivable, Recorded Investment [Line Items]
Purchased credit impaired	3,237	4,506
Total loans held for investment	63,469	149,594
Acquired | Commercial & industrial | Grade 1 - 4 (Pass)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	38,000	69,304
Acquired | Commercial & industrial | Grade 5 (Watch)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	3,172	2,982
Acquired | Commercial & industrial | Grade 6 (Special Mention)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	11,101	15,528
Acquired | Commercial & industrial | Grade 7 (Substandard-Accrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	6,058	33,850
Acquired | Commercial & industrial | Grade 8 (Substandard-Nonaccrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,901	23,424
Acquired | Owner occupied commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Purchased credit impaired	4,062	5,339
Total loans held for investment	87,324	129,334
Acquired | Owner occupied commercial real estate | Grade 1 - 4 (Pass)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	72,592	94,450
Acquired | Owner occupied commercial real estate | Grade 5 (Watch)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	8,499	2,533
Acquired | Owner occupied commercial real estate | Grade 6 (Special Mention)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile		9,788
Acquired | Owner occupied commercial real estate | Grade 7 (Substandard-Accrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	285	8,282
Acquired | Owner occupied commercial real estate | Grade 8 (Substandard-Nonaccrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,886	8,942
Acquired | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Purchased credit impaired	6,437	10,807
Total loans held for investment	244,418	327,722
Acquired | Commercial real estate | Grade 1 - 4 (Pass)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	173,765	248,583
Acquired | Commercial real estate | Grade 5 (Watch)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	43,775	23,854
Acquired | Commercial real estate | Grade 6 (Special Mention)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	20,129	39,833
Acquired | Commercial real estate | Grade 7 (Substandard-Accrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile		2,643
Acquired | Commercial real estate | Grade 8 (Substandard-Nonaccrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	312	2,002
Acquired | Construction, land & land development
Financing Receivable, Recorded Investment [Line Items]
Purchased credit impaired		1,819
Total loans held for investment	27,954	69,705
Acquired | Construction, land & land development | Grade 1 - 4 (Pass)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	14,549	49,849
Acquired | Construction, land & land development | Grade 5 (Watch)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	12,136	12,859
Acquired | Construction, land & land development | Grade 6 (Special Mention)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile		2,577
Acquired | Construction, land & land development | Grade 7 (Substandard-Accrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	555	1,623
Acquired | Construction, land & land development | Grade 8 (Substandard-Nonaccrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	714	978
Acquired | Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Purchased credit impaired	2,229	2,717
Total loans held for investment	89,559	117,746
Acquired | Residential mortgage | Grade 1 - 4 (Pass)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	85,461	111,818
Acquired | Residential mortgage | Grade 5 (Watch)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,023	948
Acquired | Residential mortgage | Grade 6 (Special Mention)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	202	215
Acquired | Residential mortgage | Grade 7 (Substandard-Accrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	190	356
Acquired | Residential mortgage | Grade 8 (Substandard-Nonaccrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	454	1,692
Acquired | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	1,270	2,191
Acquired | Consumer and other | Grade 1 - 4 (Pass)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,059	1,972
Acquired | Consumer and other | Grade 6 (Special Mention)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile		214
Acquired | Consumer and other | Grade 8 (Substandard-Nonaccrual)
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	$ 211	$ 5