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LOANS - Summary of Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Total loans	$ 2,641,092	$ 2,490,227
Business Activities Loans
Financing Receivable, Past Due [Line Items]
Total Past Due	15,551	14,439
Current	1,819,679	1,616,458
Total loans	1,835,230	1,630,897
Past Due 90 days and Accruing	50	50
Business Activities Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	8,685	5,260
Business Activities Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,969	707
Business Activities Loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	3,897	8,472
Business Activities Loans | Commercial real estate:
Financing Receivable, Past Due [Line Items]
Total Past Due	3,642	7,871
Current	693,796	571,863
Total loans	697,438	579,734
Past Due 90 days and Accruing	0	0
Business Activities Loans | Commercial real estate: | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	258	0
Current	31,129	23,754
Total loans	31,387	23,754
Past Due 90 days and Accruing	0	0
Business Activities Loans | Commercial real estate: | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	3,384	7,871
Current	662,667	548,109
Total loans	666,051	555,980
Past Due 90 days and Accruing	0	0
Business Activities Loans | Commercial real estate: | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	245	1,146
Business Activities Loans | Commercial real estate: | 30-59 Days Past Due | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	205	0
Business Activities Loans | Commercial real estate: | 30-59 Days Past Due | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	40	1,146
Business Activities Loans | Commercial real estate: | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,587	0
Business Activities Loans | Commercial real estate: | 60-89 Days Past Due | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	53	0
Business Activities Loans | Commercial real estate: | 60-89 Days Past Due | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	1,534	0
Business Activities Loans | Commercial real estate: | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,810	6,725
Business Activities Loans | Commercial real estate: | 90 Days or Greater Past Due | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Commercial real estate: | 90 Days or Greater Past Due | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	1,810	6,725
Business Activities Loans | Commercial and industrial:
Financing Receivable, Past Due [Line Items]
Total Past Due	1,588	953
Current	324,982	312,709
Total loans	326,570	313,662
Past Due 90 days and Accruing	0	50
Business Activities Loans | Commercial and industrial: | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	1,396	857
Current	238,296	233,900
Total loans	239,692	234,757
Past Due 90 days and Accruing	0	50
Business Activities Loans | Commercial and industrial: | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	192	96
Current	19,826	22,221
Total loans	20,018	22,317
Past Due 90 days and Accruing	0	0
Business Activities Loans | Commercial and industrial: | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Current	66,860	56,588
Total loans	66,860	56,588
Past Due 90 days and Accruing	0	0
Business Activities Loans | Commercial and industrial: | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	514	460
Business Activities Loans | Commercial and industrial: | 30-59 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	452	395
Business Activities Loans | Commercial and industrial: | 30-59 Days Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	62	65
Business Activities Loans | Commercial and industrial: | 30-59 Days Past Due | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Commercial and industrial: | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	84	66
Business Activities Loans | Commercial and industrial: | 60-89 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	50	60
Business Activities Loans | Commercial and industrial: | 60-89 Days Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	34	6
Business Activities Loans | Commercial and industrial: | 60-89 Days Past Due | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Commercial and industrial: | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	990	427
Business Activities Loans | Commercial and industrial: | 90 Days or Greater Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	894	402
Business Activities Loans | Commercial and industrial: | 90 Days or Greater Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	96	25
Business Activities Loans | Commercial and industrial: | 90 Days or Greater Past Due | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total Past Due	5,230	8,824
Current	1,018,778	884,572
Total loans	1,024,008	893,396
Past Due 90 days and Accruing	0	50
Business Activities Loans | Total commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	759	1,606
Business Activities Loans | Total commercial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,671	66
Business Activities Loans | Total commercial loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,800	7,152
Business Activities Loans | Residential real estate:
Financing Receivable, Past Due [Line Items]
Total Past Due	9,204	5,515
Current	731,483	664,674
Total loans	740,687	670,189
Past Due 90 days and Accruing	0	0
Business Activities Loans | Residential real estate: | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	9,204	5,515
Current	731,483	664,674
Total loans	740,687	670,189
Past Due 90 days and Accruing	0	0
Business Activities Loans | Residential real estate: | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	7,293	3,565
Business Activities Loans | Residential real estate: | 30-59 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	7,293	3,565
Business Activities Loans | Residential real estate: | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,243	641
Business Activities Loans | Residential real estate: | 60-89 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	1,243	641
Business Activities Loans | Residential real estate: | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	668	1,309
Business Activities Loans | Residential real estate: | 90 Days or Greater Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	668	1,309
Business Activities Loans | Consumer:
Financing Receivable, Past Due [Line Items]
Total Past Due	1,117	100
Current	69,418	67,212
Total loans	70,535	67,312
Past Due 90 days and Accruing	50	0
Business Activities Loans | Consumer: | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	1,069	72
Current	58,299	57,826
Total loans	59,368	57,898
Past Due 90 days and Accruing	50	0
Business Activities Loans | Consumer: | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	48	28
Current	11,119	9,386
Total loans	11,167	9,414
Past Due 90 days and Accruing	0	0
Business Activities Loans | Consumer: | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	633	89
Business Activities Loans | Consumer: | 30-59 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	597	72
Business Activities Loans | Consumer: | 30-59 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	36	17
Business Activities Loans | Consumer: | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	55	0
Business Activities Loans | Consumer: | 60-89 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	43	0
Business Activities Loans | Consumer: | 60-89 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	12	0
Business Activities Loans | Consumer: | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	429	11
Business Activities Loans | Consumer: | 90 Days or Greater Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	429	0
Business Activities Loans | Consumer: | 90 Days or Greater Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	0	11
Acquired Loans
Financing Receivable, Past Due [Line Items]
Total Past Due	9,480	7,356
Acquired Credit Impaired	18,553	10,106
Total loans	805,862	859,330
Past Due 90 days and Accruing	217	196
Acquired Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	5,864	4,414
Acquired Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,013	379
Acquired Loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,603	2,563
Acquired Loans | Commercial real estate:
Financing Receivable, Past Due [Line Items]
Total Past Due	2,517	941
Acquired Credit Impaired	8,673	6,307
Total loans	233,223	246,965
Past Due 90 days and Accruing	0	0
Acquired Loans | Commercial real estate: | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	12	0
Acquired Credit Impaired	384	164
Total loans	2,903	2,890
Past Due 90 days and Accruing	0	0
Acquired Loans | Commercial real estate: | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	2,505	941
Acquired Credit Impaired	8,289	6,143
Total loans	230,320	244,075
Past Due 90 days and Accruing	0	0
Acquired Loans | Commercial real estate: | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,029	631
Acquired Loans | Commercial real estate: | 30-59 Days Past Due | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Commercial real estate: | 30-59 Days Past Due | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	2,029	631
Acquired Loans | Commercial real estate: | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	257	99
Acquired Loans | Commercial real estate: | 60-89 Days Past Due | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	12	0
Acquired Loans | Commercial real estate: | 60-89 Days Past Due | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	245	99
Acquired Loans | Commercial real estate: | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	231	211
Acquired Loans | Commercial real estate: | 90 Days or Greater Past Due | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Commercial real estate: | 90 Days or Greater Past Due | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	231	211
Acquired Loans | Commercial and industrial:
Financing Receivable, Past Due [Line Items]
Total Past Due	915	669
Acquired Credit Impaired	2,932	679
Total loans	96,721	91,208
Past Due 90 days and Accruing	0	0
Acquired Loans | Commercial and industrial: | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	915	669
Acquired Credit Impaired	2,723	679
Total loans	59,072	52,470
Past Due 90 days and Accruing	0	0
Acquired Loans | Commercial and industrial: | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Credit Impaired	173	0
Total loans	206	0
Past Due 90 days and Accruing	0	0
Acquired Loans | Commercial and industrial: | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Credit Impaired	36	0
Total loans	37,443	38,738
Past Due 90 days and Accruing	0	0
Acquired Loans | Commercial and industrial: | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	440	149
Acquired Loans | Commercial and industrial: | 30-59 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	440	149
Acquired Loans | Commercial and industrial: | 30-59 Days Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Commercial and industrial: | 30-59 Days Past Due | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Commercial and industrial: | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	335	26
Acquired Loans | Commercial and industrial: | 60-89 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	335	26
Acquired Loans | Commercial and industrial: | 60-89 Days Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Commercial and industrial: | 60-89 Days Past Due | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Commercial and industrial: | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	140	494
Acquired Loans | Commercial and industrial: | 90 Days or Greater Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	140	494
Acquired Loans | Commercial and industrial: | 90 Days or Greater Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Commercial and industrial: | 90 Days or Greater Past Due | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total Past Due	3,432	1,610
Acquired Credit Impaired	11,605	6,986
Total loans	329,944	338,173
Past Due 90 days and Accruing	0	0
Acquired Loans | Total commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,469	780
Acquired Loans | Total commercial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	592	125
Acquired Loans | Total commercial loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	371	705
Acquired Loans | Residential real estate:
Financing Receivable, Past Due [Line Items]
Total Past Due	5,064	5,465
Acquired Credit Impaired	5,591	3,095
Total loans	411,170	474,509
Past Due 90 days and Accruing	0	189
Acquired Loans | Residential real estate: | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	5,064	5,465
Acquired Credit Impaired	5,591	3,095
Total loans	411,170	474,509
Past Due 90 days and Accruing	0	189
Acquired Loans | Residential real estate: | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	3,185	3,419
Acquired Loans | Residential real estate: | 30-59 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	3,185	3,419
Acquired Loans | Residential real estate: | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	864	254
Acquired Loans | Residential real estate: | 60-89 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	864	254
Acquired Loans | Residential real estate: | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,015	1,792
Acquired Loans | Residential real estate: | 90 Days or Greater Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	1,015	1,792
Acquired Loans | Consumer:
Financing Receivable, Past Due [Line Items]
Total Past Due	984	281
Acquired Credit Impaired	1,357	25
Total loans	64,748	46,648
Past Due 90 days and Accruing	217	7
Acquired Loans | Consumer: | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	973	264
Acquired Credit Impaired	1,291	22
Total loans	63,033	45,291
Past Due 90 days and Accruing	217	7
Acquired Loans | Consumer: | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	11	17
Acquired Credit Impaired	66	3
Total loans	1,715	1,357
Past Due 90 days and Accruing	0	0
Acquired Loans | Consumer: | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	210	215
Acquired Loans | Consumer: | 30-59 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	208	198
Acquired Loans | Consumer: | 30-59 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	2	17
Acquired Loans | Consumer: | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	557	0
Acquired Loans | Consumer: | 60-89 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	548	0
Acquired Loans | Consumer: | 60-89 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	9	0
Acquired Loans | Consumer: | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	217	66
Acquired Loans | Consumer: | 90 Days or Greater Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	217	66
Acquired Loans | Consumer: | 90 Days or Greater Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 0	$ 0

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