INVESTMENT SECURITIES, CONTINUOUS UNREALIZED LOSS POSITION (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Available-for-Sale:
Less Than 12 Months, Fair Value	$ 19,389	$ 107,759
Less Than 12 Months, Unrealized Losses	56	939
12 Months or More, Fair Value	203,421	110,869
12 Months or More, Unrealized Losses	5,992	3,085
Held-to-Maturity:
Less Than 12 Months, Fair Value	766	9,824
Less Than 12 Months, Unrealized Losses	2	133
12 Months or More, Fair Value	21,742	6,747
12 Months or More, Unrealized Losses	779	189
U.S. Treasury notes
Available-for-Sale:
Less Than 12 Months, Fair Value	0	2,259
Less Than 12 Months, Unrealized Losses	0	24
12 Months or More, Fair Value	2,235	0
12 Months or More, Unrealized Losses	43	0
U.S. Agency notes
Available-for-Sale:
Less Than 12 Months, Fair Value	4,988	33,651
Less Than 12 Months, Unrealized Losses	7	344
12 Months or More, Fair Value	73,351	44,560
12 Months or More, Unrealized Losses	2,361	1,289
U.S. Agency mortgage-backed securities
Available-for-Sale:
Less Than 12 Months, Fair Value	137	24,433
Less Than 12 Months, Unrealized Losses	0	142
12 Months or More, Fair Value	55,217	41,080
12 Months or More, Unrealized Losses	1,981	1,085
Non-taxable Municipal Securities
Available-for-Sale:
Less Than 12 Months, Fair Value	14,264	36,348
Less Than 12 Months, Unrealized Losses	49	315
12 Months or More, Fair Value	58,211	24,197
12 Months or More, Unrealized Losses	1,373	703
Held-to-Maturity:
Less Than 12 Months, Fair Value	366	9,824
Less Than 12 Months, Unrealized Losses	1	133
12 Months or More, Fair Value	18,588	3,542
12 Months or More, Unrealized Losses	634	94
Taxable Municipal Securities
Available-for-Sale:
Less Than 12 Months, Fair Value	0	11,068
Less Than 12 Months, Unrealized Losses	0	114
12 Months or More, Fair Value	14,407	1,032
12 Months or More, Unrealized Losses	234	8
Held-to-Maturity:
Less Than 12 Months, Fair Value	400	0
Less Than 12 Months, Unrealized Losses	1	0
12 Months or More, Fair Value	3,154	3,205
12 Months or More, Unrealized Losses	$ 145	$ 95