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LOANS - Summary of Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Total loans	$ 2,578,238	$ 2,490,227
Business Activities Loans
Financing Receivable, Past Due [Line Items]
Total Past Due	12,310	14,439
Current	1,772,937	1,616,458
Total loans	1,785,247	1,630,897
Past Due More Than 90 days and Accruing	124	50
Business Activities Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,808	5,260
Business Activities Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,528	707
Business Activities Loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	7,974	8,472
Business Activities Loans | Total commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	7,118	7,871
Current	642,149	571,863
Total loans	649,267	579,734
Past Due More Than 90 days and Accruing	0	0
Business Activities Loans | Total commercial real estate | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	73	0
Current	33,451	23,754
Total loans	33,524	23,754
Past Due More Than 90 days and Accruing	0	0
Business Activities Loans | Total commercial real estate | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	7,045	7,871
Current	608,698	548,109
Total loans	615,743	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	1,031	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	73	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	958	1,146
Business Activities Loans | Total commercial real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	831	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	831	0
Business Activities Loans | Total commercial real estate | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	5,256	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	0	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	5,256	6,725
Business Activities Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	1,321	953
Current	332,215	312,709
Total loans	333,536	313,662
Past Due More Than 90 days and Accruing	0	50
Business Activities Loans | Commercial and industrial | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	1,129	857
Current	243,386	233,900
Total loans	244,515	234,757
Past Due More Than 90 days and Accruing	0	50
Business Activities Loans | Commercial and industrial | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	192	96
Current	21,455	22,221
Total loans	21,647	22,317
Past Due More Than 90 days and Accruing	0	0
Business Activities Loans | Commercial and industrial | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Current	67,374	56,588
Total loans	67,374	56,588
Past Due More Than 90 days and Accruing	0	0
Business Activities Loans | Commercial and industrial | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	311	460
Business Activities Loans | Commercial and industrial | 30-59 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	144	395
Business Activities Loans | Commercial and industrial | 30-59 Days Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	167	65
Business Activities Loans | Commercial and industrial | 30-59 Days Past Due | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Commercial and industrial | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	385	66
Business Activities Loans | Commercial and industrial | 60-89 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	385	60
Business Activities Loans | Commercial and industrial | 60-89 Days Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	0	6
Business Activities Loans | Commercial and industrial | 60-89 Days Past Due | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Commercial and industrial | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	625	427
Business Activities Loans | Commercial and industrial | 90 Days or Greater Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	600	402
Business Activities Loans | Commercial and industrial | 90 Days or Greater Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	25	25
Business Activities Loans | 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	8,439	8,824
Current	974,364	884,572
Total loans	982,803	893,396
Past Due More Than 90 days and Accruing	0	50
Business Activities Loans | Total commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,342	1,606
Business Activities Loans | Total commercial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,216	66
Business Activities Loans | Total commercial loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	5,881	7,152
Business Activities Loans | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	3,171	5,515
Current	728,272	664,674
Total loans	731,443	670,189
Past Due More Than 90 days and Accruing	124	0
Business Activities Loans | Residential mortgages | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	3,171	5,515
Current	728,272	664,674
Total loans	731,443	670,189
Past Due More Than 90 days and Accruing	124	0
Business Activities Loans | Residential mortgages | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,194	3,565
Business Activities Loans | Residential mortgages | 30-59 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	1,194	3,565
Business Activities Loans | Residential mortgages | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	233	641
Business Activities Loans | Residential mortgages | 60-89 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	233	641
Business Activities Loans | Residential mortgages | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,744	1,309
Business Activities Loans | Residential mortgages | 90 Days or Greater Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	1,744	1,309
Business Activities Loans | Consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	700	100
Current	70,301	67,212
Total loans	71,001	67,312
Past Due More Than 90 days and Accruing	0	0
Business Activities Loans | Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	674	72
Current	59,649	57,826
Total loans	60,323	57,898
Past Due More Than 90 days and Accruing	0	0
Business Activities Loans | Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	26	28
Current	10,652	9,386
Total loans	10,678	9,414
Past Due More Than 90 days and Accruing	0	0
Business Activities Loans | Consumer | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	272	89
Business Activities Loans | Consumer | 30-59 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	253	72
Business Activities Loans | Consumer | 30-59 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	19	17
Business Activities Loans | Consumer | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	79	0
Business Activities Loans | Consumer | 60-89 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	72	0
Business Activities Loans | Consumer | 60-89 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	7	0
Business Activities Loans | Consumer | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	349	11
Business Activities Loans | Consumer | 90 Days or Greater Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	349	0
Business Activities Loans | 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	4,402	7,356
Current	10,071
Acquired Credit Impaired		10,106
Total loans	792,991	859,330
Past Due More Than 90 days and Accruing	0	196
Acquired Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,234	4,414
Acquired Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	877	379
Acquired Loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,291	2,563
Acquired Loans | Total commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	1,131	941
Current	6,390
Acquired Credit Impaired		6,307
Total loans	232,212	246,965
Past Due More Than 90 days and Accruing	0	0
Acquired Loans | Total commercial real estate | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Current	181
Acquired Credit Impaired		164
Total loans	2,858	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	1,131	941
Current	6,209
Acquired Credit Impaired		6,143
Total loans	229,354	244,075
Past Due More Than 90 days and Accruing	0	0
Acquired Loans | Total commercial real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	810	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	0	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	810	631
Acquired Loans | Total commercial real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	63	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	63	99
Acquired Loans | Total commercial real estate | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	258	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	258	211
Acquired Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	589	669
Current	509
Acquired Credit Impaired		679
Total loans	83,189	91,208
Past Due More Than 90 days and Accruing	0	0
Acquired Loans | Commercial and industrial | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	589	669
Current	509
Acquired Credit Impaired		679
Total loans	45,867	52,470
Past Due More Than 90 days and Accruing	0	0
Acquired Loans | 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 | Commercial and industrial | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Current	0
Acquired Credit Impaired		0
Total loans	37,322	38,738
Past Due More Than 90 days and Accruing	0	0
Acquired Loans | Commercial and industrial | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	98	149
Acquired Loans | Commercial and industrial | 30-59 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	98	149
Acquired Loans | Commercial and industrial | 30-59 Days Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Commercial and industrial | 30-59 Days Past Due | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Commercial and industrial | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	36	26
Acquired Loans | Commercial and industrial | 60-89 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	36	26
Acquired Loans | Commercial and industrial | 60-89 Days Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Commercial and industrial | 60-89 Days Past Due | Tax exempt
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Commercial and industrial | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	455	494
Acquired Loans | Commercial and industrial | 90 Days or Greater Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	455	494
Acquired Loans | Commercial and industrial | 90 Days or Greater Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | 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	1,720	1,610
Current	6,899
Acquired Credit Impaired		6,986
Total loans	315,401	338,173
Past Due More Than 90 days and Accruing	0	0
Acquired Loans | Total commercial loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	908	780
Acquired Loans | Total commercial loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	99	125
Acquired Loans | Total commercial loans | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	713	705
Acquired Loans | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	2,311	5,465
Current	3,152
Acquired Credit Impaired		3,095
Total loans	436,316	474,509
Past Due More Than 90 days and Accruing	0	0
Acquired Loans | Residential mortgages | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	2,311	5,465
Current	3,152
Acquired Credit Impaired		3,095
Total loans	436,316	474,509
Past Due More Than 90 days and Accruing	0	0
Acquired Loans | Residential mortgages | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,014	3,419
Acquired Loans | Residential mortgages | 30-59 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	1,014	3,419
Acquired Loans | Residential mortgages | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	735	254
Acquired Loans | Residential mortgages | 60-89 Days Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	735	254
Acquired Loans | Residential mortgages | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	562	1,792
Acquired Loans | Residential mortgages | 90 Days or Greater Past Due | Residential mortgages
Financing Receivable, Past Due [Line Items]
Total Past Due	562	1,792
Acquired Loans | Consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	371	281
Current	20
Acquired Credit Impaired		25
Total loans	41,274	46,648
Past Due More Than 90 days and Accruing	0	196
Acquired Loans | Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	371	264
Current	20
Acquired Credit Impaired		22
Total loans	40,135	45,291
Past Due More Than 90 days and Accruing	0	7
Acquired Loans | Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	0	17
Current	0
Acquired Credit Impaired		3
Total loans	1,139	1,357
Past Due More Than 90 days and Accruing	0	189
Acquired Loans | Consumer | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	312	215
Acquired Loans | Consumer | 30-59 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	312	198
Acquired Loans | Consumer | 30-59 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	0	17
Acquired Loans | Consumer | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	43	0
Acquired Loans | Consumer | 60-89 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	43	0
Acquired Loans | Consumer | 60-89 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | Consumer | 90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	16	66
Acquired Loans | Consumer | 90 Days or Greater Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	16	66
Acquired Loans | Consumer | 90 Days or Greater Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 0	$ 0

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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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Amount of financing receivable not past due.

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