LOANS - Summary Information Pertaining to Non-accrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Non-accrual loans
Total loans	$ 16,679	$ 18,235
Business Activities Loans
Non-accrual loans
Total loans	13,541	14,111
Acquired Loans
Non-accrual loans
Total loans	3,138	4,124
Total commercial real estate
Non-accrual loans
Total loans	8,519	8,156
Total commercial real estate \| Business Activities Loans
Non-accrual loans
Total loans	8,173	7,874
Total commercial real estate \| Acquired Loans
Non-accrual loans
Total loans	346	282
Total commercial real estate \| Construction and land development
Non-accrual loans
Total loans	1	1
Total commercial real estate \| Construction and land development \| Business Activities Loans
Non-accrual loans
Total loans	1	1
Total commercial real estate \| Construction and land development \| Acquired Loans
Non-accrual loans
Total loans	0	0
Total commercial real estate \| Other commercial real estate
Non-accrual loans
Total loans	8,518	8,155
Total commercial real estate \| Other commercial real estate \| Business Activities Loans
Non-accrual loans
Total loans	8,172	7,873
Total commercial real estate \| Other commercial real estate \| Acquired Loans
Non-accrual loans
Total loans	346	282
Total commercial and industrial
Non-accrual loans
Total loans	2,077	2,331
Total commercial and industrial \| Business Activities Loans
Non-accrual loans
Total loans	1,502	1,688
Total commercial and industrial \| Acquired Loans
Non-accrual loans
Total loans	575	643
Total commercial and industrial \| Commercial
Non-accrual loans
Total loans	1,843	2,066
Total commercial and industrial \| Commercial \| Business Activities Loans
Non-accrual loans
Total loans	1,268	1,423
Total commercial and industrial \| Commercial \| Acquired Loans
Non-accrual loans
Total loans	575	643
Total commercial and industrial \| Agricultural
Non-accrual loans
Total loans	234	265
Total commercial and industrial \| Agricultural \| Business Activities Loans
Non-accrual loans
Total loans	234	265
Total commercial and industrial \| Agricultural \| Acquired Loans
Non-accrual loans
Total loans	0	0
Total commercial and industrial \| Tax exempt
Non-accrual loans
Total loans	0	0
Total commercial and industrial \| Tax exempt \| Business Activities Loans
Non-accrual loans
Total loans	0	0
Total commercial and industrial \| Tax exempt \| Acquired Loans
Non-accrual loans
Total loans	0	0
Total commercial loans
Non-accrual loans
Total loans	10,596	10,487
Total commercial loans \| Business Activities Loans
Non-accrual loans
Total loans	9,675	9,562
Total commercial loans \| Acquired Loans
Non-accrual loans
Total loans	921	925
Total residential real estate
Non-accrual loans
Total loans	5,340	7,210
Total residential real estate \| Business Activities Loans
Non-accrual loans
Total loans	3,277	4,213
Total residential real estate \| Acquired Loans
Non-accrual loans
Total loans	2,063	2,997
Total residential real estate \| Residential mortgages
Non-accrual loans
Total loans	5,340	7,210
Total residential real estate \| Residential mortgages \| Business Activities Loans
Non-accrual loans
Total loans	3,277	4,213
Total residential real estate \| Residential mortgages \| Acquired Loans
Non-accrual loans
Total loans	2,063	2,997
Total consumer
Non-accrual loans
Total loans	743	538
Total consumer \| Business Activities Loans
Non-accrual loans
Total loans	589	336
Total consumer \| Acquired Loans
Non-accrual loans
Total loans	154	202
Total consumer \| Home equity
Non-accrual loans
Total loans	718	447
Total consumer \| Home equity \| Business Activities Loans
Non-accrual loans
Total loans	564	246
Total consumer \| Home equity \| Acquired Loans
Non-accrual loans
Total loans	154	201
Total consumer \| Other consumer
Non-accrual loans
Total loans	25	91
Total consumer \| Other consumer \| Business Activities Loans
Non-accrual loans
Total loans	25	90
Total consumer \| Other consumer \| Acquired Loans
Non-accrual loans
Total loans	$ 0	$ 1