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LOANS - Summary of Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 2,490,227	$ 2,485,613
Business Activities Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	14,439	15,498
Current	1,616,458	1,437,132
Total loans	1,630,897	1,452,630
Past Due 90 days and Accruing	50	494
Business Activities Loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,260	4,840
Business Activities Loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	707	2,882
Business Activities Loans | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,472	7,776
Business Activities Loans | Commercial real estate:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,871	8,326
Current	571,863	525,685
Total loans	579,734	534,011
Past Due 90 days and Accruing	0	119
Business Activities Loans | Commercial real estate: | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	637
Current	23,754	28,255
Total loans	23,754	28,892
Past Due 90 days and Accruing	0	0
Business Activities Loans | Commercial real estate: | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,871	7,689
Current	548,109	497,430
Total loans	555,980	505,119
Past Due 90 days and Accruing	0	119
Business Activities Loans | Commercial real estate: | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,146	965
Business Activities Loans | 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
Business Activities Loans | Commercial real estate: | 30-59 Days Past Due | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,146	965
Business Activities Loans | Commercial real estate: | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	1,659
Business Activities Loans | Commercial real estate: | 60-89 Days Past Due | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Commercial real estate: | 60-89 Days Past Due | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	1,659
Business Activities Loans | Commercial real estate: | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,725	5,702
Business Activities Loans | 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	637
Business Activities Loans | Commercial real estate: | 90 Days or Greater Past Due | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,725	5,065
Business Activities Loans | Commercial and industrial:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	953	1,616
Current	312,709	266,388
Total loans	313,662	268,004
Past Due 90 days and Accruing	50	176
Business Activities Loans | Commercial and industrial: | Other Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	857	1,217
Current	233,900	196,834
Total loans	234,757	198,051
Past Due 90 days and Accruing	50	21
Business Activities Loans | Commercial and industrial: | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	96	399
Current	22,221	27,189
Total loans	22,317	27,588
Past Due 90 days and Accruing	0	155
Business Activities Loans | Commercial and industrial: | Tax exempt
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Current	56,588	42,365
Total loans	56,588	42,365
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	460	228
Business Activities Loans | Commercial and industrial: | 30-59 Days Past Due | Other Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	395	186
Business Activities Loans | Commercial and industrial: | 30-59 Days Past Due | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	65	42
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	66	488
Business Activities Loans | Commercial and industrial: | 60-89 Days Past Due | Other Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	60	329
Business Activities Loans | Commercial and industrial: | 60-89 Days Past Due | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6	159
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	427	900
Business Activities Loans | Commercial and industrial: | 90 Days or Greater Past Due | Other Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	402	702
Business Activities Loans | Commercial and industrial: | 90 Days or Greater Past Due | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	25	198
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	8,824	9,942
Current	884,572	792,073
Total loans	893,396	802,015
Past Due 90 days and Accruing	50	295
Business Activities Loans | Total commercial loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,606	1,193
Business Activities Loans | Total commercial loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	66	2,147
Business Activities Loans | Total commercial loans | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,152	6,602
Business Activities Loans | Residential real estate:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,515	4,782
Current	664,674	586,629
Total loans	670,189	591,411
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	5,515	4,782
Current	664,674	586,629
Total loans	670,189	591,411
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	3,565	3,096
Business Activities Loans | Residential real estate: | 30-59 Days Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,565	3,096
Business Activities Loans | Residential real estate: | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	641	711
Business Activities Loans | Residential real estate: | 60-89 Days Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	641	711
Business Activities Loans | Residential real estate: | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,309	975
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	1,309	975
Business Activities Loans | Consumer:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	100	774
Current	67,212	58,430
Total loans	67,312	59,204
Past Due 90 days and Accruing	0	199
Business Activities Loans | Consumer: | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	72	714
Current	57,826	50,662
Total loans	57,898	51,376
Past Due 90 days and Accruing	0	199
Business Activities Loans | Consumer: | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	28	60
Current	9,386	7,768
Total loans	9,414	7,828
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	89	551
Business Activities Loans | Consumer: | 30-59 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	72	515
Business Activities Loans | Consumer: | 30-59 Days Past Due | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	17	36
Business Activities Loans | Consumer: | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	24
Business Activities Loans | Consumer: | 60-89 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Consumer: | 60-89 Days Past Due | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	24
Business Activities Loans | Consumer: | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	11	199
Business Activities Loans | Consumer: | 90 Days or Greater Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	199
Business Activities Loans | Consumer: | 90 Days or Greater Past Due | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	11	0
Acquired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,356	3,088
Current	10,106	12,587
Total loans	859,330	1,032,983
Past Due 90 days and Accruing	196	16
Acquired Loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,414	1,406
Acquired Loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	379	528
Acquired Loans | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,563	1,154
Acquired Loans | Commercial real estate:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	941	822
Current	6,307	8,655
Total loans	246,965	292,735
Past Due 90 days and Accruing	0	0
Acquired Loans | Commercial real estate: | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	133
Current	164	258
Total loans	2,890	16,781
Past Due 90 days and Accruing	0	0
Acquired Loans | Commercial real estate: | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	941	689
Current	6,143	8,397
Total loans	244,075	275,954
Past Due 90 days and Accruing	0	0
Acquired Loans | Commercial real estate: | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	631	402
Acquired Loans | Commercial real estate: | 30-59 Days Past Due | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	124
Acquired Loans | Commercial real estate: | 30-59 Days Past Due | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	631	278
Acquired Loans | Commercial real estate: | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	99	9
Acquired Loans | Commercial real estate: | 60-89 Days Past Due | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	9
Acquired Loans | Commercial real estate: | 60-89 Days Past Due | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	99	0
Acquired Loans | Commercial real estate: | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	211	411
Acquired Loans | 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 | Commercial real estate: | 90 Days or Greater Past Due | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	211	411
Acquired Loans | Commercial and industrial:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	669	188
Current	679	632
Total loans	91,208	111,419
Past Due 90 days and Accruing	0	0
Acquired Loans | Commercial and industrial: | Other Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	669	188
Current	679	632
Total loans	52,470	68,069
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
Current	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
Current	0	0
Total loans	38,738	43,350
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	149	125
Acquired Loans | Commercial and industrial: | 30-59 Days Past Due | Other Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	149	125
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	26	14
Acquired Loans | Commercial and industrial: | 60-89 Days Past Due | Other Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	26	14
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	494	49
Acquired Loans | Commercial and industrial: | 90 Days or Greater Past Due | Other Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	494	49
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	1,610	1,010
Current	6,986	9,287
Total loans	338,173	404,154
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	780	527
Acquired Loans | Total commercial loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	125	23
Acquired Loans | Total commercial loans | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	705	460
Acquired Loans | Residential real estate:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,465	1,754
Current	3,095	3,259
Total loans	474,509	564,271
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	5,465	1,754
Current	3,095	3,259
Total loans	474,509	564,271
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	3,419	752
Acquired Loans | Residential real estate: | 30-59 Days Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,419	752
Acquired Loans | Residential real estate: | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	254	388
Acquired Loans | Residential real estate: | 60-89 Days Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	254	388
Acquired Loans | Residential real estate: | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,792	614
Acquired Loans | Residential real estate: | 90 Days or Greater Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,792	614
Acquired Loans | Consumer:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	281	324
Current	25	41
Total loans	46,648	64,558
Past Due 90 days and Accruing	196	16
Acquired Loans | Consumer: | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	264	322
Current	22	38
Total loans	45,291	62,217
Past Due 90 days and Accruing	7	16
Acquired Loans | Consumer: | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	17	2
Current	3	3
Total loans	1,357	2,341
Past Due 90 days and Accruing	189	0
Acquired Loans | Consumer: | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	215	127
Acquired Loans | Consumer: | 30-59 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	198	125
Acquired Loans | Consumer: | 30-59 Days Past Due | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	17	2
Acquired Loans | Consumer: | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	117
Acquired Loans | Consumer: | 60-89 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	117
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	66	80
Acquired Loans | Consumer: | 90 Days or Greater Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	66	80
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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Recorded investment in financing receivables that are 90 days or more past due and still accruing.

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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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