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LOANS - Summary of Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Total loans	$ 2,634,983	$ 2,641,092
Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	1,374,535	1,353,952
Total commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans	948,178	930,661
Total commercial real estate | Construction and land development
Financing Receivable, Past Due [Line Items]
Total loans	51,579	34,290
Total commercial real estate | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans	896,599	896,371
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total loans	426,357	423,291
Commercial and industrial | Commercial
Financing Receivable, Past Due [Line Items]
Total loans	340,795	298,764
Commercial and industrial | Agricultural
Financing Receivable, Past Due [Line Items]
Total loans	18,797	20,224
Commercial and industrial | Tax exempt
Financing Receivable, Past Due [Line Items]
Total loans	66,765	104,303
Residential real estate
Financing Receivable, Past Due [Line Items]
Total loans	1,132,328	1,151,857
Residential real estate | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total loans	1,132,328	1,151,857
Consumer
Financing Receivable, Past Due [Line Items]
Total loans	128,120	135,283
Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total loans	117,544	122,401
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total loans	10,576	12,882
Business Activities Loans
Financing Receivable, Past Due [Line Items]
Total Past Due	18,592	15,551
Current	1,889,966	1,819,679
Total loans	1,908,558	1,835,230
Past Due More Than 90 days and Accruing	946	50
Business Activities Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	12,123	8,685
Business Activities Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,142	2,969
Business Activities Loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	4,327	3,897
Business Activities Loans | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total Past Due	7,563	5,230
Current	1,084,545	1,018,778
Total loans	1,092,108	1,024,008
Past Due More Than 90 days and Accruing	432	0
Business Activities Loans | Total commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,809	759
Business Activities Loans | Total commercial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,048	1,671
Business Activities Loans | Total commercial loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,706	2,800
Business Activities Loans | Total commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	3,482	3,642
Current	726,253	693,796
Total loans	729,735	697,438
Past Due More Than 90 days and Accruing	0	0
Business Activities Loans | Total commercial real estate | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	418	258
Current	48,739	31,129
Total loans	49,157	31,387
Past Due More Than 90 days and Accruing	0	0
Business Activities Loans | Total commercial real estate | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	3,064	3,384
Current	677,514	662,667
Total loans	680,578	666,051
Past Due More Than 90 days and Accruing	0	0
Business Activities Loans | Total commercial real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,663	245
Business Activities Loans | Total commercial real estate | 30-59 Days Past Due | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	142	205
Business Activities Loans | Total commercial real estate | 30-59 Days Past Due | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	1,521	40
Business Activities Loans | Total commercial real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	533	1,587
Business Activities Loans | Total commercial real estate | 60-89 Days Past Due | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	0	53
Business Activities Loans | Total commercial real estate | 60-89 Days Past Due | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	533	1,534
Business Activities Loans | Total commercial real estate | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,286	1,810
Business Activities Loans | Total commercial real estate | 90 Days or Greater Past Due | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	276	0
Business Activities Loans | Total commercial real estate | 90 Days or Greater Past Due | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	1,010	1,810
Business Activities Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	4,081	1,588
Current	358,292	324,982
Total loans	362,373	326,570
Past Due More Than 90 days and Accruing	432	0
Business Activities Loans | Commercial and industrial | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	3,874	1,396
Current	284,208	238,296
Total loans	288,082	239,692
Past Due More Than 90 days and Accruing	381	0
Business Activities Loans | Commercial and industrial | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	207	192
Current	18,390	19,826
Total loans	18,597	20,018
Past Due More Than 90 days and Accruing	51	0
Business Activities Loans | Commercial and industrial | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Current	55,694	66,860
Total loans	55,694	66,860
Past Due More Than 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	1,146	514
Business Activities Loans | Commercial and industrial | 30-59 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	1,108	452
Business Activities Loans | Commercial and industrial | 30-59 Days Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	38	62
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	1,515	84
Business Activities Loans | Commercial and industrial | 60-89 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	1,515	50
Business Activities Loans | Commercial and industrial | 60-89 Days Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	0	34
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	1,420	990
Business Activities Loans | Commercial and industrial | 90 Days or Greater Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	1,251	894
Business Activities Loans | Commercial and industrial | 90 Days or Greater Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	169	96
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 | Residential real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	10,100	9,204
Current	732,610	731,483
Total loans	742,710	740,687
Past Due More Than 90 days and Accruing	293	0
Business Activities Loans | Residential real estate | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	10,100	9,204
Current	732,610	731,483
Total loans	742,710	740,687
Past Due More Than 90 days and Accruing	293	0
Business Activities Loans | Residential real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	8,824	7,293
Business Activities Loans | Residential real estate | 30-59 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	8,824	7,293
Business Activities Loans | Residential real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	69	1,243
Business Activities Loans | Residential real estate | 60-89 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	69	1,243
Business Activities Loans | Residential real estate | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,207	668
Business Activities Loans | Residential real estate | 90 Days or Greater Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	1,207	668
Business Activities Loans | Consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	929	1,117
Current	72,811	69,418
Total loans	73,740	70,535
Past Due More Than 90 days and Accruing	221	50
Business Activities Loans | Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	903	1,069
Current	63,611	58,299
Total loans	64,514	59,368
Past Due More Than 90 days and Accruing	221	50
Business Activities Loans | Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	26	48
Current	9,200	11,119
Total loans	9,226	11,167
Past Due More Than 90 days and Accruing	0	0
Business Activities Loans | Consumer | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	490	633
Business Activities Loans | Consumer | 30-59 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	471	597
Business Activities Loans | Consumer | 30-59 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	19	36
Business Activities Loans | Consumer | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	25	55
Business Activities Loans | Consumer | 60-89 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	20	43
Business Activities Loans | Consumer | 60-89 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	5	12
Business Activities Loans | Consumer | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	414	429
Business Activities Loans | Consumer | 90 Days or Greater Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	412	429
Business Activities Loans | Consumer | 90 Days or Greater Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	2	0
Acquired Loans
Financing Receivable, Past Due [Line Items]
Total Past Due	10,022	9,480
Acquired Credit Impaired	15,175	18,553
Total loans	726,425	805,862
Past Due More Than 90 days and Accruing	1,181	217
Acquired Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	7,610	5,864
Acquired Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	355	2,013
Acquired Loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,057	1,603
Acquired Loans | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total Past Due	3,220	3,432
Acquired Credit Impaired	9,472	11,605
Total loans	282,427	329,944
Past Due More Than 90 days and Accruing	737
Acquired Loans | Total commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,940	2,469
Acquired Loans | Total commercial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	256	592
Acquired Loans | Total commercial loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,024	371
Acquired Loans | Total commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	3,123	2,517
Acquired Credit Impaired	7,520	8,673
Total loans	218,443	233,223
Past Due More Than 90 days and Accruing	737
Acquired Loans | Total commercial real estate | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due		12
Acquired Credit Impaired	245	384
Total loans	2,422	2,903
Acquired Loans | Total commercial real estate | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	3,123	2,505
Acquired Credit Impaired	7,275	8,289
Total loans	216,021	230,320
Past Due More Than 90 days and Accruing	737
Acquired Loans | Total commercial real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,843	2,029
Acquired Loans | Total commercial real estate | 30-59 Days Past Due | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	1,843	2,029
Acquired Loans | Total commercial real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	256	257
Acquired Loans | Total commercial real estate | 60-89 Days Past Due | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due		12
Acquired Loans | Total commercial real estate | 60-89 Days Past Due | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	256	245
Acquired Loans | Total commercial real estate | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,024	231
Acquired Loans | Total commercial real estate | 90 Days or Greater Past Due | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	1,024	231
Acquired Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	97	915
Acquired Credit Impaired	1,952	2,932
Total loans	63,984	96,721
Acquired Loans | Commercial and industrial | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	97	915
Acquired Credit Impaired	1,752	2,723
Total loans	52,713	59,072
Acquired Loans | Commercial and industrial | Agricultural
Financing Receivable, Past Due [Line Items]
Acquired Credit Impaired	200	173
Total loans	200	206
Acquired Loans | Commercial and industrial | Tax exempt
Financing Receivable, Past Due [Line Items]
Acquired Credit Impaired		36
Total loans	11,071	37,443
Acquired Loans | Commercial and industrial | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	97	440
Acquired Loans | Commercial and industrial | 30-59 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	97	440
Acquired Loans | Commercial and industrial | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due		335
Acquired Loans | Commercial and industrial | 60-89 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due		335
Acquired Loans | Commercial and industrial | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due		140
Acquired Loans | Commercial and industrial | 90 Days or Greater Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due		140
Acquired Loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	5,976	5,064
Acquired Credit Impaired	4,856	5,591
Total loans	389,618	411,170
Past Due More Than 90 days and Accruing	401
Acquired Loans | Residential real estate | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	5,976	5,064
Acquired Credit Impaired	4,856	5,591
Total loans	389,618	411,170
Past Due More Than 90 days and Accruing	401
Acquired Loans | Residential real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	5,043	3,185
Acquired Loans | Residential real estate | 30-59 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	5,043	3,185
Acquired Loans | Residential real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	99	864
Acquired Loans | Residential real estate | 60-89 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	99	864
Acquired Loans | Residential real estate | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	834	1,015
Acquired Loans | Residential real estate | 90 Days or Greater Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	834	1,015
Acquired Loans | Consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	826	984
Acquired Credit Impaired	847	1,357
Total loans	54,380	64,748
Past Due More Than 90 days and Accruing	43	217
Acquired Loans | Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	825	973
Acquired Credit Impaired	789	1,291
Total loans	53,030	63,033
Past Due More Than 90 days and Accruing	43	217
Acquired Loans | Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	1	11
Acquired Credit Impaired	58	66
Total loans	1,350	1,715
Acquired Loans | Consumer | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	627	210
Acquired Loans | Consumer | 30-59 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	626	208
Acquired Loans | Consumer | 30-59 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	1	2
Acquired Loans | Consumer | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due		557
Acquired Loans | Consumer | 60-89 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due		548
Acquired Loans | Consumer | 60-89 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due		9
Acquired Loans | Consumer | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	199	217
Acquired Loans | Consumer | 90 Days or Greater Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 199	$ 217

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