LOANS - Summary Information Pertaining to Non-accrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Non-accrual loans
Non-accrual loans	$ 15,955	$ 18,235
Business Activities Loans
Non-accrual loans
Non-accrual loans	12,886	14,111
Acquired Loans
Non-accrual loans
Non-accrual loans	3,069	4,124
Total commercial real estate
Non-accrual loans
Non-accrual loans	7,048	8,156
Total commercial real estate \| Business Activities Loans
Non-accrual loans
Non-accrual loans	6,699	7,874
Total commercial real estate \| Acquired Loans
Non-accrual loans
Non-accrual loans	349	282
Total commercial real estate \| Construction and land development
Non-accrual loans
Non-accrual loans	1	1
Total commercial real estate \| Construction and land development \| Business Activities Loans
Non-accrual loans
Non-accrual loans	1	1
Total commercial real estate \| Construction and land development \| Acquired Loans
Non-accrual loans
Non-accrual loans	0	0
Total commercial real estate \| Other commercial real estate
Non-accrual loans
Non-accrual loans	7,047	8,155
Total commercial real estate \| Other commercial real estate \| Business Activities Loans
Non-accrual loans
Non-accrual loans	6,698	7,873
Total commercial real estate \| Other commercial real estate \| Acquired Loans
Non-accrual loans
Non-accrual loans	349	282
Commercial and industrial
Non-accrual loans
Non-accrual loans	2,081	2,331
Commercial and industrial \| Business Activities Loans
Non-accrual loans
Non-accrual loans	1,497	1,688
Commercial and industrial \| Acquired Loans
Non-accrual loans
Non-accrual loans	584	643
Commercial and industrial \| Commercial
Non-accrual loans
Non-accrual loans	1,838	2,066
Commercial and industrial \| Commercial \| Business Activities Loans
Non-accrual loans
Non-accrual loans	1,254	1,423
Commercial and industrial \| Commercial \| Acquired Loans
Non-accrual loans
Non-accrual loans	584	643
Commercial and industrial \| Agricultural
Non-accrual loans
Non-accrual loans	243	265
Commercial and industrial \| Agricultural \| Business Activities Loans
Non-accrual loans
Non-accrual loans	243	265
Commercial and industrial \| Agricultural \| Acquired Loans
Non-accrual loans
Non-accrual loans	0	0
Commercial and industrial \| Tax exempt
Non-accrual loans
Non-accrual loans	0	0
Commercial and industrial \| Tax exempt \| Business Activities Loans
Non-accrual loans
Non-accrual loans	0	0
Commercial and industrial \| Tax exempt \| Acquired Loans
Non-accrual loans
Non-accrual loans	0	0
Total commercial loans
Non-accrual loans
Non-accrual loans	9,129	10,487
Total commercial loans \| Business Activities Loans
Non-accrual loans
Non-accrual loans	8,196	9,562
Total commercial loans \| Acquired Loans
Non-accrual loans
Non-accrual loans	933	925
Residential mortgages
Non-accrual loans
Non-accrual loans	5,965	7,210
Residential mortgages \| Business Activities Loans
Non-accrual loans
Non-accrual loans	4,023	4,213
Residential mortgages \| Acquired Loans
Non-accrual loans
Non-accrual loans	1,942	2,997
Residential mortgages \| Residential mortgages
Non-accrual loans
Non-accrual loans	5,965	7,210
Residential mortgages \| Residential mortgages \| Business Activities Loans
Non-accrual loans
Non-accrual loans	4,023	4,213
Residential mortgages \| Residential mortgages \| Acquired Loans
Non-accrual loans
Non-accrual loans	1,942	2,997
Consumer
Non-accrual loans
Non-accrual loans	861	538
Consumer \| Business Activities Loans
Non-accrual loans
Non-accrual loans	667	336
Consumer \| Acquired Loans
Non-accrual loans
Non-accrual loans	194	202
Consumer \| Home equity
Non-accrual loans
Non-accrual loans	779	447
Consumer \| Home equity \| Business Activities Loans
Non-accrual loans
Non-accrual loans	585	246
Consumer \| Home equity \| Acquired Loans
Non-accrual loans
Non-accrual loans	194	201
Consumer \| Other consumer
Non-accrual loans
Non-accrual loans	82	91
Consumer \| Other consumer \| Business Activities Loans
Non-accrual loans
Non-accrual loans	82	90
Consumer \| Other consumer \| Acquired Loans
Non-accrual loans
Non-accrual loans	$ 0	$ 1