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LOANS - Summary of Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Total loans	$ 2,577,306	$ 2,490,227
Business Activities Loans
Financing Receivable, Past Due [Line Items]
Total Past Due	12,221	14,439
Current	1,815,915	1,616,458
Total loans	1,828,136	1,630,897
Past Due More Than 90 days and Accruing	144	50
Business Activities Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,410	5,260
Business Activities Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	609	707
Business Activities Loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	9,202	8,472
Business Activities Loans | Total commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	7,887	7,871
Current	693,800	571,863
Total loans	701,687	579,734
Past Due More Than 90 days and Accruing	73	0
Business Activities Loans | Total commercial real estate | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	73	0
Current	28,729	23,754
Total loans	28,802	23,754
Past Due More Than 90 days and Accruing	73	0
Business Activities Loans | Total commercial real estate | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	7,814	7,871
Current	665,071	548,109
Total loans	672,885	555,980
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	985	1,146
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	0
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	985	1,146
Business Activities Loans | Total commercial real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	56	0
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	0
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	56	0
Business Activities Loans | Total commercial real estate | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	6,846	6,725
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	73	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	6,773	6,725
Business Activities Loans | Total commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	2,199	953
Current	324,944	312,709
Total loans	327,143	313,662
Past Due More Than 90 days and Accruing	0	50
Business Activities Loans | Total commercial and industrial | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	1,981	857
Current	237,913	233,900
Total loans	239,894	234,757
Past Due More Than 90 days and Accruing	0	50
Business Activities Loans | Total commercial and industrial | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	218	96
Current	20,988	22,221
Total loans	21,206	22,317
Past Due More Than 90 days and Accruing	0	0
Business Activities Loans | Total commercial and industrial | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Current	66,043	56,588
Total loans	66,043	56,588
Past Due More Than 90 days and Accruing	0	0
Business Activities Loans | Total commercial and industrial | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	893	460
Business Activities Loans | Total commercial and industrial | 30-59 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	772	395
Business Activities Loans | Total commercial and industrial | 30-59 Days Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	121	65
Business Activities Loans | Total commercial and industrial | 30-59 Days Past Due | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Total commercial and industrial | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	136	66
Business Activities Loans | Total commercial and industrial | 60-89 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	64	60
Business Activities Loans | Total commercial and industrial | 60-89 Days Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	72	6
Business Activities Loans | Total commercial and industrial | 60-89 Days Past Due | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Total commercial and industrial | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,170	427
Business Activities Loans | Total commercial and industrial | 90 Days or Greater Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	1,145	402
Business Activities Loans | Total commercial and industrial | 90 Days or Greater Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	25	25
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	0
Business Activities Loans | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total Past Due	10,086	8,824
Current	1,018,744	884,572
Total loans	1,028,830	893,396
Past Due More Than 90 days and Accruing	73	50
Business Activities Loans | Total commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,878	1,606
Business Activities Loans | Total commercial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	192	66
Business Activities Loans | Total commercial loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	8,016	7,152
Business Activities Loans | Total residential real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	1,615	5,515
Current	728,901	664,674
Total loans	730,516	670,189
Past Due More Than 90 days and Accruing	71	0
Business Activities Loans | Total residential real estate | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	1,615	5,515
Current	728,901	664,674
Total loans	730,516	670,189
Past Due More Than 90 days and Accruing	71	0
Business Activities Loans | Total residential real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	399	3,565
Business Activities Loans | Total residential real estate | 30-59 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	399	3,565
Business Activities Loans | Total residential real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	345	641
Business Activities Loans | Total residential real estate | 60-89 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	345	641
Business Activities Loans | Total residential real estate | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	871	1,309
Business Activities Loans | Total residential real estate | 90 Days or Greater Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	871	1,309
Business Activities Loans | Total consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	520	100
Current	68,270	67,212
Total loans	68,790	67,312
Past Due More Than 90 days and Accruing	0	0
Business Activities Loans | Total consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	511	72
Current	58,045	57,826
Total loans	58,556	57,898
Past Due More Than 90 days and Accruing	0	0
Business Activities Loans | Total consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	9	28
Current	10,225	9,386
Total loans	10,234	9,414
Past Due More Than 90 days and Accruing	0	0
Business Activities Loans | Total consumer | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	133	89
Business Activities Loans | Total consumer | 30-59 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	131	72
Business Activities Loans | Total consumer | 30-59 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	2	17
Business Activities Loans | Total consumer | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	72	0
Business Activities Loans | Total consumer | 60-89 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	65	0
Business Activities Loans | Total consumer | 60-89 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	7	0
Business Activities Loans | Total consumer | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	315	11
Business Activities Loans | Total consumer | 90 Days or Greater Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	315	0
Business Activities Loans | Total 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	3,784	7,356
Current	8,410
Acquired Credit Impaired		10,106
Total loans	749,170	859,330
Past Due More Than 90 days and Accruing	543	196
Acquired Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,047	4,414
Acquired Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	693	379
Acquired Loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,044	2,563
Acquired Loans | Total commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	686	941
Current	5,049
Acquired Credit Impaired		6,307
Total loans	222,086	246,965
Past Due More Than 90 days and Accruing	72	0
Acquired Loans | Total commercial real estate | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	12	0
Current	190
Acquired Credit Impaired		164
Total loans	2,064	2,890
Past Due More Than 90 days and Accruing	0	0
Acquired Loans | Total commercial real estate | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	674	941
Current	4,859
Acquired Credit Impaired		6,143
Total loans	220,022	244,075
Past Due More Than 90 days and Accruing	72	0
Acquired Loans | Total commercial real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	446	631
Acquired Loans | Total commercial real estate | 30-59 Days Past Due | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	12	0
Acquired Loans | Total commercial real estate | 30-59 Days Past Due | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	434	631
Acquired Loans | Total commercial real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	99
Acquired Loans | Total commercial real estate | 60-89 Days Past Due | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Total commercial real estate | 60-89 Days Past Due | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	0	99
Acquired Loans | Total commercial real estate | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	240	211
Acquired Loans | Total 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 | Total commercial real estate | 90 Days or Greater Past Due | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	240	211
Acquired Loans | Total commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	791	669
Current	249
Acquired Credit Impaired		679
Total loans	75,563	91,208
Past Due More Than 90 days and Accruing	387	0
Acquired Loans | Total commercial and industrial | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	791	669
Current	249
Acquired Credit Impaired		679
Total loans	40,490	52,470
Past Due More Than 90 days and Accruing	387	0
Acquired Loans | Total commercial and industrial | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Current	0
Acquired Credit Impaired		0
Total loans	0	0
Past Due More Than 90 days and Accruing	0	0
Acquired Loans | Total commercial and industrial | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Current	0
Acquired Credit Impaired		0
Total loans	35,073	38,738
Past Due More Than 90 days and Accruing	0	0
Acquired Loans | Total commercial and industrial | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	149
Acquired Loans | Total commercial and industrial | 30-59 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	0	149
Acquired Loans | Total commercial and industrial | 30-59 Days Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Total commercial and industrial | 30-59 Days Past Due | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Total commercial and industrial | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	41	26
Acquired Loans | Total commercial and industrial | 60-89 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	41	26
Acquired Loans | Total commercial and industrial | 60-89 Days Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Total commercial and industrial | 60-89 Days Past Due | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Total commercial and industrial | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	750	494
Acquired Loans | Total commercial and industrial | 90 Days or Greater Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	750	494
Acquired Loans | Total commercial and industrial | 90 Days or Greater Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Total 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	1,477	1,610
Current	5,298
Acquired Credit Impaired		6,986
Total loans	297,649	338,173
Past Due More Than 90 days and Accruing	459	0
Acquired Loans | Total commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	446	780
Acquired Loans | Total commercial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	41	125
Acquired Loans | Total commercial loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	990	705
Acquired Loans | Total residential real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	1,638	5,465
Current	3,093
Acquired Credit Impaired		3,095
Total loans	412,936	474,509
Past Due More Than 90 days and Accruing	47	0
Acquired Loans | Total residential real estate | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	1,638	5,465
Current	3,093
Acquired Credit Impaired		3,095
Total loans	412,936	474,509
Past Due More Than 90 days and Accruing	47	0
Acquired Loans | Total residential real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	245	3,419
Acquired Loans | Total residential real estate | 30-59 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	245	3,419
Acquired Loans | Total residential real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	519	254
Acquired Loans | Total residential real estate | 60-89 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	519	254
Acquired Loans | Total residential real estate | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	874	1,792
Acquired Loans | Total residential real estate | 90 Days or Greater Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	874	1,792
Acquired Loans | Total consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	669	281
Current	19
Acquired Credit Impaired		25
Total loans	38,585	46,648
Past Due More Than 90 days and Accruing	37	196
Acquired Loans | Total consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	669	264
Current	19
Acquired Credit Impaired		22
Total loans	37,600	45,291
Past Due More Than 90 days and Accruing	37	7
Acquired Loans | Total consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	0	17
Current	0
Acquired Credit Impaired		3
Total loans	985	1,357
Past Due More Than 90 days and Accruing	0	189
Acquired Loans | Total consumer | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	356	215
Acquired Loans | Total consumer | 30-59 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	356	198
Acquired Loans | Total consumer | 30-59 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	0	17
Acquired Loans | Total consumer | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	133	0
Acquired Loans | Total consumer | 60-89 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	133	0
Acquired Loans | Total consumer | 60-89 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Total consumer | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	180	66
Acquired Loans | Total consumer | 90 Days or Greater Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	180	66
Acquired Loans | Total consumer | 90 Days or Greater Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 0	$ 0

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Amount of financing receivable not past due.

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