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LOANS - Summary of Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 2,526,959	$ 2,490,227
Business Activities Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	11,457	14,439
Current	1,684,412	1,616,458
Total loans	1,695,869	1,630,897
Past Due 90 days and Accruing	14	50
Business Activities Loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,183	5,260
Business Activities Loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	804	707
Business Activities Loans | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,470	8,472
Business Activities Loans | Total commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,594	7,871
Current	572,339	571,863
Total loans	579,933	579,734
Past Due 90 days and Accruing	0	0
Business Activities Loans | Total commercial real estate | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	74	0
Current	34,708	23,754
Total loans	34,782	23,754
Past Due 90 days and Accruing	0	0
Business Activities Loans | Total commercial real estate | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,520	7,871
Current	537,631	548,109
Total loans	545,151	555,980
Past Due 90 days and Accruing	0	0
Business Activities Loans | Total commercial real estate | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,636	1,146
Business Activities Loans | Total commercial real estate | 30-59 Days Past Due | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1	0
Business Activities Loans | Total commercial real estate | 30-59 Days Past Due | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,635	1,146
Business Activities Loans | Total commercial real estate | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	576	0
Business Activities Loans | Total commercial real estate | 60-89 Days Past Due | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	73	0
Business Activities Loans | Total commercial real estate | 60-89 Days Past Due | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	503	0
Business Activities Loans | Total commercial real estate | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,382	6,725
Business Activities Loans | Total commercial real estate | 90 Days or Greater Past Due | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Total commercial real estate | 90 Days or Greater Past Due | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,382	6,725
Business Activities Loans | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	952	953
Current	324,051	312,709
Total loans	325,003	313,662
Past Due 90 days and Accruing	14	50
Business Activities Loans | Commercial and industrial | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	813	857
Current	235,255	233,900
Total loans	236,068	234,757
Past Due 90 days and Accruing	14	50
Business Activities Loans | Commercial and industrial | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	139	96
Current	22,069	22,221
Total loans	22,208	22,317
Past Due 90 days and Accruing	0	0
Business Activities Loans | Commercial and industrial | Tax exempt
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Current	66,727	56,588
Total loans	66,727	56,588
Past Due 90 days and Accruing	0	0
Business Activities Loans | Commercial and industrial | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	264	460
Business Activities Loans | Commercial and industrial | 30-59 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	182	395
Business Activities Loans | Commercial and industrial | 30-59 Days Past Due | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	82	65
Business Activities Loans | Commercial and industrial | 30-59 Days Past Due | Tax exempt
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Commercial and industrial | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	32	66
Business Activities Loans | Commercial and industrial | 60-89 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	32	60
Business Activities Loans | Commercial and industrial | 60-89 Days Past Due | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	6
Business Activities Loans | Commercial and industrial | 60-89 Days Past Due | Tax exempt
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Commercial and industrial | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	656	427
Business Activities Loans | Commercial and industrial | 90 Days or Greater Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	599	402
Business Activities Loans | Commercial and industrial | 90 Days or Greater Past Due | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	57	25
Business Activities Loans | Commercial and industrial | 90 Days or Greater Past Due | Tax exempt
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Total commercial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,546	8,824
Current	896,390	884,572
Total loans	904,936	893,396
Past Due 90 days and Accruing	14	50
Business Activities Loans | Total commercial loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,900	1,606
Business Activities Loans | Total commercial loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	608	66
Business Activities Loans | Total commercial loans | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,038	7,152
Business Activities Loans | Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,758	5,515
Current	720,667	664,674
Total loans	723,425	670,189
Past Due 90 days and Accruing	0	0
Business Activities Loans | Residential Real Estate | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,758	5,515
Current	720,667	664,674
Total loans	723,425	670,189
Past Due 90 days and Accruing	0	0
Business Activities Loans | Residential Real Estate | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,234	3,565
Business Activities Loans | Residential Real Estate | 30-59 Days Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,234	3,565
Business Activities Loans | Residential Real Estate | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	167	641
Business Activities Loans | Residential Real Estate | 60-89 Days Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	167	641
Business Activities Loans | Residential Real Estate | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,357	1,309
Business Activities Loans | Residential Real Estate | 90 Days or Greater Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,357	1,309
Business Activities Loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	153	100
Current	67,355	67,212
Total loans	67,508	67,312
Past Due 90 days and Accruing	0	0
Business Activities Loans | Consumer | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	127	72
Current	58,569	57,826
Total loans	58,696	57,898
Past Due 90 days and Accruing	0	0
Business Activities Loans | Consumer | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	26	28
Current	8,786	9,386
Total loans	8,812	9,414
Past Due 90 days and Accruing	0	0
Business Activities Loans | Consumer | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	49	89
Business Activities Loans | Consumer | 30-59 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	40	72
Business Activities Loans | Consumer | 30-59 Days Past Due | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	9	17
Business Activities Loans | Consumer | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	29	0
Business Activities Loans | Consumer | 60-89 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	23	0
Business Activities Loans | Consumer | 60-89 Days Past Due | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6	0
Business Activities Loans | Consumer | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	75	11
Business Activities Loans | Consumer | 90 Days or Greater Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	64	0
Business Activities Loans | Consumer | 90 Days or Greater Past Due | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	11	11
Acquired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,332	7,356
Acquired Credit Impaired	9,975	10,106
Total loans	831,090	859,330
Past Due 90 days and Accruing	0	196
Acquired Loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,241	4,414
Acquired Loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	344	379
Acquired Loans | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,747	2,563
Acquired Loans | Total commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	271	941
Acquired Credit Impaired	6,375	6,307
Total loans	241,634	246,965
Past Due 90 days and Accruing	0	0
Acquired Loans | Total commercial real estate | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	13	0
Acquired Credit Impaired	173	164
Total loans	2,851	2,890
Past Due 90 days and Accruing	0	0
Acquired Loans | Total commercial real estate | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	258	941
Acquired Credit Impaired	6,202	6,143
Total loans	238,783	244,075
Past Due 90 days and Accruing	0	0
Acquired Loans | Total commercial real estate | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	70	631
Acquired Loans | Total commercial real estate | 30-59 Days Past Due | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Total commercial real estate | 30-59 Days Past Due | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	70	631
Acquired Loans | Total commercial real estate | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	13	99
Acquired Loans | Total commercial real estate | 60-89 Days Past Due | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	13	0
Acquired Loans | Total commercial real estate | 60-89 Days Past Due | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	99
Acquired Loans | Total commercial real estate | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	188	211
Acquired Loans | Total commercial real estate | 90 Days or Greater Past Due | Construction and land development
Financing Receivable, Recorded Investment, 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, Recorded Investment, Past Due [Line Items]
Total Past Due	188	211
Acquired Loans | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	664	669
Acquired Credit Impaired	466	679
Total loans	84,934	91,208
Past Due 90 days and Accruing	0	0
Acquired Loans | Commercial and industrial | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	664	669
Acquired Credit Impaired	466	679
Total loans	46,909	52,470
Past Due 90 days and Accruing	0	0
Acquired Loans | Commercial and industrial | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Acquired Credit Impaired	0	0
Total loans	0	0
Past Due 90 days and Accruing	0	0
Acquired Loans | Commercial and industrial | Tax exempt
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Acquired Credit Impaired	0	0
Total loans	38,025	38,738
Past Due 90 days and Accruing	0	0
Acquired Loans | Commercial and industrial | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	68	149
Acquired Loans | Commercial and industrial | 30-59 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	68	149
Acquired Loans | Commercial and industrial | 30-59 Days Past Due | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Commercial and industrial | 30-59 Days Past Due | Tax exempt
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Commercial and industrial | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	209	26
Acquired Loans | Commercial and industrial | 60-89 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	209	26
Acquired Loans | Commercial and industrial | 60-89 Days Past Due | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Commercial and industrial | 60-89 Days Past Due | Tax exempt
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Commercial and industrial | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	387	494
Acquired Loans | Commercial and industrial | 90 Days or Greater Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	387	494
Acquired Loans | Commercial and industrial | 90 Days or Greater Past Due | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Commercial and industrial | 90 Days or Greater Past Due | Tax exempt
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Total commercial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	935	1,610
Acquired Credit Impaired	6,841	6,986
Total loans	326,568	338,173
Past Due 90 days and Accruing	0	0
Acquired Loans | Total commercial loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	138	780
Acquired Loans | Total commercial loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	222	125
Acquired Loans | Total commercial loans | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	575	705
Acquired Loans | Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,052	5,465
Acquired Credit Impaired	3,112	3,095
Total loans	460,628	474,509
Past Due 90 days and Accruing	0	0
Acquired Loans | Residential Real Estate | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,052	5,465
Acquired Credit Impaired	3,112	3,095
Total loans	460,628	474,509
Past Due 90 days and Accruing	0	0
Acquired Loans | Residential Real Estate | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,777	3,419
Acquired Loans | Residential Real Estate | 30-59 Days Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,777	3,419
Acquired Loans | Residential Real Estate | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	119	254
Acquired Loans | Residential Real Estate | 60-89 Days Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	119	254
Acquired Loans | Residential Real Estate | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,156	1,792
Acquired Loans | Residential Real Estate | 90 Days or Greater Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,156	1,792
Acquired Loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	345	281
Acquired Credit Impaired	22	25
Total loans	43,894	46,648
Past Due 90 days and Accruing	0	196
Acquired Loans | Consumer | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	343	264
Acquired Credit Impaired	21	22
Total loans	42,683	45,291
Past Due 90 days and Accruing	0	7
Acquired Loans | Consumer | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2	17
Acquired Credit Impaired	1	3
Total loans	1,211	1,357
Past Due 90 days and Accruing	0	189
Acquired Loans | Consumer | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	326	215
Acquired Loans | Consumer | 30-59 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	324	198
Acquired Loans | Consumer | 30-59 Days Past Due | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2	17
Acquired Loans | Consumer | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3	0
Acquired Loans | Consumer | 60-89 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3	0
Acquired Loans | Consumer | 60-89 Days Past Due | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Consumer | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	16	66
Acquired Loans | Consumer | 90 Days or Greater Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	16	66
Acquired Loans | Consumer | 90 Days or Greater Past Due | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 0	$ 0

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- Definition

The carrying amount as of the balance sheet date of loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer, for which it was deemed probable at acquisition that the investor would be unable to collect all contractually required payments, and to which the income recognition total model was not applied.

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Financing receivables that are current.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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