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LOANS - Summary of Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Total loans	$ 2,562,885	$ 2,634,593
Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	1,525,450	1,353,952
Total commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans	1,084,381	930,661
Total commercial real estate | Construction and land development
Financing Receivable, Past Due [Line Items]
Total loans	131,123	34,290
Total commercial real estate | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans	953,258	896,371
Total commercial and industrial
Financing Receivable, Past Due [Line Items]
Total loans	441,069	423,291
Total commercial and industrial | Commercial
Financing Receivable, Past Due [Line Items]
Total loans	360,688	298,764
Total commercial and industrial | Agricultural
Financing Receivable, Past Due [Line Items]
Total loans	16,950	20,224
Total commercial and industrial | Tax exempt
Financing Receivable, Past Due [Line Items]
Total loans	63,431	104,303
Total residential real estate
Financing Receivable, Past Due [Line Items]
Total loans	923,891	1,145,358
Total residential real estate | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total loans	923,891	1,145,358
Total consumer
Financing Receivable, Past Due [Line Items]
Total loans	113,544	135,283
Total consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total loans	102,464	122,401
Total consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total loans	11,080	12,882
Business Activities Loans
Financing Receivable, Past Due [Line Items]
Total Past Due	11,667	15,551
Current	1,953,087	1,813,180
Total loans	1,964,754	1,828,731
Past Due More Than 90 days and Accruing	3	50
Business Activities Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	6,800	8,685
Business Activities Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,678	2,969
Business Activities Loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,189	3,897
Business Activities Loans | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total Past Due	2,284	5,230
Current	1,264,064	1,018,778
Total loans	1,266,348	1,024,008
Business Activities Loans | Total commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	466	759
Business Activities Loans | Total commercial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	774	1,671
Business Activities Loans | Total commercial loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,044	2,800
Business Activities Loans | Total commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	1,769	3,642
Current	893,348	693,796
Total loans	895,117	697,438
Business Activities Loans | Total commercial real estate | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	1	258
Current	129,254	31,129
Total loans	129,255	31,387
Business Activities Loans | Total commercial real estate | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	1,768	3,384
Current	764,094	662,667
Total loans	765,862	666,051
Business Activities Loans | Total commercial real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	454	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		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	454	40
Business Activities Loans | Total commercial real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	464	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		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	464	1,534
Business Activities Loans | Total commercial real estate | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	851	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	1
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	850	1,810
Business Activities Loans | Total commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	515	1,588
Current	370,716	324,982
Total loans	371,231	326,570
Business Activities Loans | Total commercial and industrial | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	472	1,396
Current	314,533	238,296
Total loans	315,005	239,692
Business Activities Loans | Total commercial and industrial | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	43	192
Current	16,754	19,826
Total loans	16,797	20,018
Business Activities Loans | Total commercial and industrial | Tax exempt
Financing Receivable, Past Due [Line Items]
Current	39,429	66,860
Total loans	39,429	66,860
Business Activities Loans | Total commercial and industrial | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	12	514
Business Activities Loans | Total commercial and industrial | 30-59 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	5	452
Business Activities Loans | Total commercial and industrial | 30-59 Days Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	7	62
Business Activities Loans | Total commercial and industrial | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	310	84
Business Activities Loans | Total commercial and industrial | 60-89 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	310	50
Business Activities Loans | Total commercial and industrial | 60-89 Days Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due		34
Business Activities Loans | Total commercial and industrial | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	193	990
Business Activities Loans | Total commercial and industrial | 90 Days or Greater Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	157	894
Business Activities Loans | Total commercial and industrial | 90 Days or Greater Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	36	96
Business Activities Loans | Total residential real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	8,959	9,204
Current	624,431	724,984
Total loans	633,390	734,188
Business Activities Loans | Total residential real estate | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	8,959	9,204
Current	624,431	724,984
Total loans	633,390	734,188
Business Activities Loans | Total residential real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	6,219	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	6,219	7,293
Business Activities Loans | Total residential real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,767	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	1,767	1,243
Business Activities Loans | Total residential real estate | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	973	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	973	668
Business Activities Loans | Total consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	424	1,117
Current	64,592	69,418
Total loans	65,016	70,535
Past Due More Than 90 days and Accruing	3	50
Business Activities Loans | Total consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	402	1,069
Current	54,690	58,299
Total loans	55,092	59,368
Past Due More Than 90 days and Accruing	3	50
Business Activities Loans | Total consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	22	48
Current	9,902	11,119
Total loans	9,924	11,167
Business Activities Loans | Total consumer | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	115	633
Business Activities Loans | Total consumer | 30-59 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	95	597
Business Activities Loans | Total consumer | 30-59 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	20	36
Business Activities Loans | Total consumer | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	137	55
Business Activities Loans | Total consumer | 60-89 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	137	43
Business Activities Loans | Total consumer | 60-89 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due		12
Business Activities Loans | Total consumer | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	172	429
Business Activities Loans | Total consumer | 90 Days or Greater Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	170	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	7,552	9,480
Acquired Credit Impaired	12,686	18,553
Total loans	598,131	805,862
Past Due More Than 90 days and Accruing	121	217
Acquired Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	4,300	5,864
Acquired Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,170	2,013
Acquired Loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,082	1,603
Acquired Loans | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total Past Due	3,475	3,432
Acquired Credit Impaired	7,456	11,605
Total loans	259,102	329,944
Acquired Loans | Total commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,544	2,469
Acquired Loans | Total commercial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	105	592
Acquired Loans | Total commercial loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	826	371
Acquired Loans | Total commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	3,160	2,517
Acquired Credit Impaired	6,433	8,673
Total loans	189,264	233,223
Acquired Loans | Total commercial real estate | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due		12
Acquired Credit Impaired	74	384
Total loans	1,868	2,903
Acquired Loans | Total commercial real estate | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	3,160	2,505
Acquired Credit Impaired	6,359	8,289
Total loans	187,396	230,320
Acquired Loans | Total commercial real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,360	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	2,360	2,029
Acquired Loans | Total commercial real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	105	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	105	245
Acquired Loans | Total commercial real estate | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	695	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	695	231
Acquired Loans | Total commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	315	915
Acquired Credit Impaired	1,023	2,932
Total loans	69,838	96,721
Acquired Loans | Total commercial and industrial | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	315	915
Acquired Credit Impaired	870	2,723
Total loans	45,683	59,072
Acquired Loans | Total commercial and industrial | Agricultural
Financing Receivable, Past Due [Line Items]
Acquired Credit Impaired	153	173
Total loans	153	206
Acquired Loans | Total commercial and industrial | Tax exempt
Financing Receivable, Past Due [Line Items]
Acquired Credit Impaired		36
Total loans	24,002	37,443
Acquired Loans | Total commercial and industrial | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	184	440
Acquired Loans | Total commercial and industrial | 30-59 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	184	440
Acquired Loans | Total commercial and industrial | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due		335
Acquired Loans | Total commercial and industrial | 60-89 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due		335
Acquired Loans | Total commercial and industrial | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	131	140
Acquired Loans | Total commercial and industrial | 90 Days or Greater Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	131	140
Acquired Loans | Total residential real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	2,519	5,064
Acquired Credit Impaired	4,532	5,591
Total loans	290,501	411,170
Past Due More Than 90 days and Accruing	121
Acquired Loans | Total residential real estate | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	2,519	5,064
Acquired Credit Impaired	4,532	5,591
Total loans	290,501	411,170
Past Due More Than 90 days and Accruing	121
Acquired Loans | Total residential real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	785	3,185
Acquired Loans | Total residential real estate | 30-59 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	785	3,185
Acquired Loans | Total residential real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	579	864
Acquired Loans | Total residential real estate | 60-89 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	579	864
Acquired Loans | Total residential real estate | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,155	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	1,155	1,015
Acquired Loans | Total consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	1,558	984
Acquired Credit Impaired	698	1,357
Total loans	48,528	64,748
Past Due More Than 90 days and Accruing		217
Acquired Loans | Total consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	1,558	973
Acquired Credit Impaired	659	1,291
Total loans	47,372	63,033
Past Due More Than 90 days and Accruing		217
Acquired Loans | Total consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due		11
Acquired Credit Impaired	39	66
Total loans	1,156	1,715
Acquired Loans | Total consumer | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	971	210
Acquired Loans | Total consumer | 30-59 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	971	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	486	557
Acquired Loans | Total consumer | 60-89 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	486	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	101	217
Acquired Loans | Total consumer | 90 Days or Greater Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 101	$ 217

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