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LOANS - Summary of Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Total loans	$ 2,729,417	$ 2,641,092
Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	1,521,512	1,353,952
Total commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans	982,070	930,661
Total commercial real estate | Construction and land development
Financing Receivable, Past Due [Line Items]
Total loans	62,473	34,290
Total commercial real estate | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans	919,597	896,371
Total commercial and industrial
Financing Receivable, Past Due [Line Items]
Total loans	539,442	423,291
Total commercial and industrial | Commercial
Financing Receivable, Past Due [Line Items]
Total loans	454,339	298,764
Total commercial and industrial | Agricultural
Financing Receivable, Past Due [Line Items]
Total loans	18,185	20,224
Total commercial and industrial | Tax exempt
Financing Receivable, Past Due [Line Items]
Total loans	66,918	104,303
Total residential real estate
Financing Receivable, Past Due [Line Items]
Total loans	1,083,708	1,151,857
Total residential real estate | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total loans	1,083,708	1,151,857
Total consumer
Financing Receivable, Past Due [Line Items]
Total loans	124,197	135,283
Total consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total loans	114,099	122,401
Total consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total loans	10,098	12,882
Business Activities Loans
Financing Receivable, Past Due [Line Items]
Total Past Due	8,405	15,551
Current	2,011,197	1,819,679
Total loans	2,019,602	1,835,230
Past Due More Than 90 days and Accruing	335	50
Business Activities Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,987	8,685
Business Activities Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,291	2,969
Business Activities Loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	4,127	3,897
Business Activities Loans | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total Past Due	3,731	5,230
Current	1,222,323	1,018,778
Total loans	1,226,054	1,024,008
Past Due More Than 90 days and Accruing	65
Business Activities Loans | Total commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,622	759
Business Activities Loans | Total commercial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	318	1,671
Business Activities Loans | Total commercial loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,791	2,800
Business Activities Loans | Total commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	2,460	3,642
Current	780,585	693,796
Total loans	783,045	697,438
Past Due More Than 90 days and Accruing	0
Business Activities Loans | Total commercial real estate | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	267	258
Current	59,829	31,129
Total loans	60,096	31,387
Past Due More Than 90 days and Accruing	0
Business Activities Loans | Total commercial real estate | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	2,193	3,384
Current	720,756	662,667
Total loans	722,949	666,051
Past Due More Than 90 days and Accruing	0
Business Activities Loans | Total commercial real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,450	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	0	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	1,450	40
Business Activities Loans | Total commercial real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	23	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	23	1,534
Business Activities Loans | Total commercial real estate | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	987	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	267
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	720	1,810
Business Activities Loans | Total commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	1,271	1,588
Current	441,738	324,982
Total loans	443,009	326,570
Past Due More Than 90 days and Accruing	65
Business Activities Loans | Total commercial and industrial | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	1,093	1,396
Current	383,297	238,296
Total loans	384,390	239,692
Past Due More Than 90 days and Accruing	49
Business Activities Loans | Total commercial and industrial | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	178	192
Current	17,848	19,826
Total loans	18,026	20,018
Past Due More Than 90 days and Accruing	16
Business Activities Loans | Total commercial and industrial | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0
Current	40,593	66,860
Total loans	40,593	66,860
Past Due More Than 90 days and Accruing	0
Business Activities Loans | Total commercial and industrial | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	172	514
Business Activities Loans | Total commercial and industrial | 30-59 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	152	452
Business Activities Loans | Total commercial and industrial | 30-59 Days Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	20	62
Business Activities Loans | Total commercial and industrial | 30-59 Days Past Due | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0
Business Activities Loans | Total commercial and industrial | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	295	84
Business Activities Loans | Total commercial and industrial | 60-89 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	295	50
Business Activities Loans | Total commercial and industrial | 60-89 Days Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	0	34
Business Activities Loans | Total commercial and industrial | 60-89 Days Past Due | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0
Business Activities Loans | Total commercial and industrial | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	804	990
Business Activities Loans | Total commercial and industrial | 90 Days or Greater Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	646	894
Business Activities Loans | Total commercial and industrial | 90 Days or Greater Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	158	96
Business Activities Loans | Total commercial and industrial | 90 Days or Greater Past Due | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0
Business Activities Loans | Total residential real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	4,090	9,204
Current	721,360	731,483
Total loans	725,450	740,687
Past Due More Than 90 days and Accruing	270
Business Activities Loans | Total residential real estate | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	4,090	9,204
Current	721,360	731,483
Total loans	725,450	740,687
Past Due More Than 90 days and Accruing	270
Business Activities Loans | Total residential real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	320	7,293
Business Activities Loans | Total residential real estate | 30-59 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	320	7,293
Business Activities Loans | Total residential real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,820	1,243
Business Activities Loans | Total residential real estate | 60-89 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	1,820	1,243
Business Activities Loans | Total residential real estate | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,950	668
Business Activities Loans | Total residential real estate | 90 Days or Greater Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	1,950	668
Business Activities Loans | Total consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	584	1,117
Current	67,514	69,418
Total loans	68,098	70,535
Past Due More Than 90 days and Accruing	0	50
Business Activities Loans | Total consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	577	1,069
Current	58,836	58,299
Total loans	59,413	59,368
Past Due More Than 90 days and Accruing	0	50
Business Activities Loans | Total consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	7	48
Current	8,678	11,119
Total loans	8,685	11,167
Past Due More Than 90 days and Accruing	0
Business Activities Loans | Total consumer | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	45	633
Business Activities Loans | Total consumer | 30-59 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	40	597
Business Activities Loans | Total consumer | 30-59 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	5	36
Business Activities Loans | Total consumer | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	153	55
Business Activities Loans | Total consumer | 60-89 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	153	43
Business Activities Loans | Total consumer | 60-89 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	0	12
Business Activities Loans | Total consumer | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	386	429
Business Activities Loans | Total consumer | 90 Days or Greater Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	384	429
Business Activities Loans | Total consumer | 90 Days or Greater Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	2
Acquired Loans
Financing Receivable, Past Due [Line Items]
Total Past Due	6,045	9,480
Acquired Credit Impaired	14,770	18,553
Total loans	709,815	805,862
Past Due More Than 90 days and Accruing	770	217
Acquired Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	867	5,864
Acquired Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,491	2,013
Acquired Loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,687	1,603
Acquired Loans | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total Past Due	3,122	3,432
Acquired Credit Impaired	9,242	11,605
Total loans	295,458	329,944
Past Due More Than 90 days and Accruing	685
Acquired Loans | Total commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	161	2,469
Acquired Loans | Total commercial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,592	592
Acquired Loans | Total commercial loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,369	371
Acquired Loans | Total commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	2,568	2,517
Acquired Credit Impaired	7,262	8,673
Total loans	199,025	233,223
Past Due More Than 90 days and Accruing	298
Acquired Loans | Total commercial real estate | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due		12
Acquired Credit Impaired	269	384
Total loans	2,377	2,903
Acquired Loans | Total commercial real estate | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	2,568	2,505
Acquired Credit Impaired	6,993	8,289
Total loans	196,648	230,320
Past Due More Than 90 days and Accruing	298
Acquired Loans | Total commercial real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	113	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	113	2,029
Acquired Loans | Total commercial real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,495	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	1,495	245
Acquired Loans | Total commercial real estate | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	960	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	960	231
Acquired Loans | Total commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	554	915
Acquired Credit Impaired	1,980	2,932
Total loans	96,433	96,721
Past Due More Than 90 days and Accruing	387
Acquired Loans | Total commercial and industrial | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	554	915
Acquired Credit Impaired	1,821	2,723
Total loans	69,949	59,072
Past Due More Than 90 days and Accruing	387
Acquired Loans | Total commercial and industrial | Agricultural
Financing Receivable, Past Due [Line Items]
Acquired Credit Impaired	159	173
Total loans	159	206
Acquired Loans | Total commercial and industrial | Tax exempt
Financing Receivable, Past Due [Line Items]
Acquired Credit Impaired		36
Total loans	26,325	37,443
Acquired Loans | Total commercial and industrial | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	48	440
Acquired Loans | Total commercial and industrial | 30-59 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	48	440
Acquired Loans | Total commercial and industrial | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	97	335
Acquired Loans | Total commercial and industrial | 60-89 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	97	335
Acquired Loans | Total commercial and industrial | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	409	140
Acquired Loans | Total commercial and industrial | 90 Days or Greater Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	409	140
Acquired Loans | Total residential real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	1,996	5,064
Acquired Credit Impaired	4,715	5,591
Total loans	358,258	411,170
Past Due More Than 90 days and Accruing	60
Acquired Loans | Total residential real estate | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	1,996	5,064
Acquired Credit Impaired	4,715	5,591
Total loans	358,258	411,170
Past Due More Than 90 days and Accruing	60
Acquired Loans | Total residential real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	433	3,185
Acquired Loans | Total residential real estate | 30-59 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	433	3,185
Acquired Loans | Total residential real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	530	864
Acquired Loans | Total residential real estate | 60-89 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	530	864
Acquired Loans | Total residential real estate | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,033	1,015
Acquired Loans | Total residential real estate | 90 Days or Greater Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	1,033	1,015
Acquired Loans | Total consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	927	984
Acquired Credit Impaired	813	1,357
Total loans	56,099	64,748
Past Due More Than 90 days and Accruing	25	217
Acquired Loans | Total consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	927	973
Acquired Credit Impaired	766	1,291
Total loans	54,686	63,033
Past Due More Than 90 days and Accruing	25	217
Acquired Loans | Total consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due		11
Acquired Credit Impaired	47	66
Total loans	1,413	1,715
Acquired Loans | Total consumer | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	273	210
Acquired Loans | Total consumer | 30-59 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	273	208
Acquired Loans | Total consumer | 30-59 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due		2
Acquired Loans | Total consumer | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	369	557
Acquired Loans | Total consumer | 60-89 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	369	548
Acquired Loans | Total consumer | 60-89 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due		9
Acquired Loans | Total consumer | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	285	217
Acquired Loans | Total consumer | 90 Days or Greater Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 285	$ 217

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