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LOANS AND ALLOWANCE FOR LOAN LOSSES - Loan Portfolio Summarized by Aging Categories of Performing Loans and Nonaccrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 2,018,526	$ 1,613,914
Past Due	3,445	19,759
90+ (still accruing) Days Past Due	521	2,232
Non-Accrual	7,899	10,657
Financing Receivable, before Allowance for Credit Loss	2,029,870	1,644,330
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,004,560	1,594,695
Past Due	2,585	14,773
90+ (still accruing) Days Past Due	0	219
Non-Accrual	7,899	10,657
Financing Receivable, before Allowance for Credit Loss	2,015,044	1,620,125
Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	13,966	19,219
Past Due	860	4,986
90+ (still accruing) Days Past Due	521	2,013
Non-Accrual	0	0
Financing Receivable, before Allowance for Credit Loss	14,826	24,205
30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,590	14,926
30 to 59 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,292	12,938
30 to 59 Days Past Due | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	298	1,988
60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	334	2,601
60 to 89 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	293	1,616
60 to 89 Days Past Due | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	41	985
Commercial real estate | Owner occupied | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	157,456	158,723
Past Due	1,270	144
90+ (still accruing) Days Past Due	0	0
Non-Accrual	3,313	5,842
Financing Receivable, before Allowance for Credit Loss	162,039	164,709
Commercial real estate | Owner occupied | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	4,584	6,015
Past Due	0	160
90+ (still accruing) Days Past Due	0	31
Non-Accrual	0	0
Financing Receivable, before Allowance for Credit Loss	4,584	6,175
Commercial real estate | Owner occupied | 30 to 59 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,090	144
Commercial real estate | Owner occupied | 30 to 59 Days Past Due | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Commercial real estate | Owner occupied | 60 to 89 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	180	0
Commercial real estate | Owner occupied | 60 to 89 Days Past Due | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	129
Commercial real estate | Non-owner occupied | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	402,805	359,425
Past Due	0	480
90+ (still accruing) Days Past Due	0	0
Non-Accrual	0	0
Financing Receivable, before Allowance for Credit Loss	402,805	359,905
Commercial real estate | Non-owner occupied | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	333	564
Past Due	0	581
90+ (still accruing) Days Past Due	0	581
Non-Accrual	0	0
Financing Receivable, before Allowance for Credit Loss	333	1,145
Commercial real estate | Non-owner occupied | 30 to 59 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	480
Commercial real estate | Non-owner occupied | 30 to 59 Days Past Due | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Commercial real estate | Non-owner occupied | 60 to 89 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Commercial real estate | Non-owner occupied | 60 to 89 Days Past Due | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Commercial real estate | Multi-family | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	110,079	105,865
Past Due	0	0
90+ (still accruing) Days Past Due	0	0
Non-Accrual	74	345
Financing Receivable, before Allowance for Credit Loss	110,153	106,210
Commercial real estate | Multi-family | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		683
Past Due		0
90+ (still accruing) Days Past Due		0
Non-Accrual		0
Financing Receivable, before Allowance for Credit Loss		683
Commercial real estate | Multi-family | 30 to 59 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Commercial real estate | Multi-family | 30 to 59 Days Past Due | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		0
Commercial real estate | Multi-family | 60 to 89 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Commercial real estate | Multi-family | 60 to 89 Days Past Due | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		0
Commercial real estate | Non-owner occupied residential | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	110,292	116,370
Past Due	0	976
90+ (still accruing) Days Past Due	0	69
Non-Accrual	275	235
Financing Receivable, before Allowance for Credit Loss	110,567	117,581
Commercial real estate | Non-owner occupied residential | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,234	1,710
Past Due	157	747
90+ (still accruing) Days Past Due	157	531
Non-Accrual	0	0
Financing Receivable, before Allowance for Credit Loss	1,391	2,457
Commercial real estate | Non-owner occupied residential | 30 to 59 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	841
Commercial real estate | Non-owner occupied residential | 30 to 59 Days Past Due | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	105
Commercial real estate | Non-owner occupied residential | 60 to 89 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	66
Commercial real estate | Non-owner occupied residential | 60 to 89 Days Past Due | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	111
Acquisition and development | 1-4 family residential construction | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	9,627	15,587
Past Due	0	278
90+ (still accruing) Days Past Due	0	0
Non-Accrual	0	0
Financing Receivable, before Allowance for Credit Loss	9,627	15,865
Acquisition and development | 1-4 family residential construction | 30 to 59 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	278
Acquisition and development | 1-4 family residential construction | 60 to 89 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Acquisition and development | Commercial and land development | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	36,940	40,403
Past Due	73	1,135
90+ (still accruing) Days Past Due	0	0
Non-Accrual	837	0
Financing Receivable, before Allowance for Credit Loss	37,850	41,538
Acquisition and development | Commercial and land development | 30 to 59 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	73	1,135
Acquisition and development | Commercial and land development | 60 to 89 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Commercial and industrial | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	686,537	208,668
Past Due	164	315
90+ (still accruing) Days Past Due	0	0
Non-Accrual	755	1,763
Financing Receivable, before Allowance for Credit Loss	687,456	210,746
Commercial and industrial | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,857	3,792
Past Due	17	16
90+ (still accruing) Days Past Due	17	16
Non-Accrual	0	0
Financing Receivable, before Allowance for Credit Loss	2,874	3,808
Commercial and industrial | 30 to 59 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	107	315
Commercial and industrial | 30 to 59 Days Past Due | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Commercial and industrial | 60 to 89 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	57	0
Commercial and industrial | 60 to 89 Days Past Due | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Municipal | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	28,867	47,057
Past Due	0	0
90+ (still accruing) Days Past Due	0	0
Non-Accrual	0	0
Financing Receivable, before Allowance for Credit Loss	28,867	47,057
Municipal | 30 to 59 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Municipal | 60 to 89 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Residential mortgage | First lien | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	264,989	314,473
Past Due	680	10,476
90+ (still accruing) Days Past Due	0	150
Non-Accrual	1,927	1,659
Financing Receivable, before Allowance for Credit Loss	267,596	326,608
Residential mortgage | First lien | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	4,868	6,308
Past Due	685	3,456
90+ (still accruing) Days Past Due	347	854
Non-Accrual	0	0
Financing Receivable, before Allowance for Credit Loss	5,553	9,764
Residential mortgage | First lien | 30 to 59 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	646	9,092
Residential mortgage | First lien | 30 to 59 Days Past Due | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	298	1,857
Residential mortgage | First lien | 60 to 89 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	34	1,234
Residential mortgage | First lien | 60 to 89 Days Past Due | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	40	745
Residential mortgage | Home equity - term | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	11,067	13,993
Past Due	12	4
90+ (still accruing) Days Past Due	0	0
Non-Accrual	11	13
Financing Receivable, before Allowance for Credit Loss	11,090	14,010
Residential mortgage | Home equity - term | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	18	16
Past Due	0	4
90+ (still accruing) Days Past Due	0	0
Non-Accrual	0	0
Financing Receivable, before Allowance for Credit Loss	18	20
Residential mortgage | Home equity - term | 30 to 59 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1	0
Residential mortgage | Home equity - term | 30 to 59 Days Past Due | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	4
Residential mortgage | Home equity - term | 60 to 89 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	11	4
Residential mortgage | Home equity - term | 60 to 89 Days Past Due | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Residential mortgage | Home equity - lines of credit | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	157,143	163,907
Past Due	276	692
90+ (still accruing) Days Past Due	0	0
Non-Accrual	687	715
Financing Receivable, before Allowance for Credit Loss	158,106	165,314
Residential mortgage | Home equity - lines of credit | 30 to 59 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	276	417
Residential mortgage | Home equity - lines of credit | 60 to 89 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	275
Installment and other loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	28,758	50,224
Past Due	110	273
90+ (still accruing) Days Past Due	0	0
Non-Accrual	20	85
Financing Receivable, before Allowance for Credit Loss	28,888	50,582
Installment and other loans | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	72	131
Past Due	1	22
90+ (still accruing) Days Past Due	0	0
Non-Accrual	0	0
Financing Receivable, before Allowance for Credit Loss	73	153
Installment and other loans | 30 to 59 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	99	236
Installment and other loans | 30 to 59 Days Past Due | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	22
Installment and other loans | 60 to 89 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	11	37
Installment and other loans | 60 to 89 Days Past Due | Loans Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 1	$ 0

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