INVESTMENT SECURITIES, CONTINUOUS UNREALIZED LOSS POSITION (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Investment Securities Available-for-Sale:
Less Than 12 Months, Fair Value	$ 107,878	$ 234,467
Less Than 12 Months, Unrealized Losses	941	4,985
12 Months or More, Fair Value	112,405	4,696
12 Months or More, Unrealized Losses	3,133	147
Investment Securities Held-to-Maturity:
Less Than 12 Months, Fair Value	9,824	28,459
Less Than 12 Months, Unrealized Losses	133	468
12 Months or More, Fair Value	6,747	2,564
12 Months or More, Unrealized Losses	189	101
U.S. Treasury notes
Investment Securities Available-for-Sale:
Less Than 12 Months, Fair Value	2,259	16,076
Less Than 12 Months, Unrealized Losses	24	76
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
U.S. Agency notes
Investment Securities Available-for-Sale:
Less Than 12 Months, Fair Value	33,651	69,784
Less Than 12 Months, Unrealized Losses	344	1,848
12 Months or More, Fair Value	44,560	0
12 Months or More, Unrealized Losses	1,289	0
U.S. Agency mortgage-backed securities
Investment Securities Available-for-Sale:
Less Than 12 Months, Fair Value	24,433	64,564
Less Than 12 Months, Unrealized Losses	142	1,310
12 Months or More, Fair Value	41,080	3,518
12 Months or More, Unrealized Losses	1,085	134
Non-taxable Municipal Securities
Investment Securities Available-for-Sale:
Less Than 12 Months, Fair Value	36,348	72,867
Less Than 12 Months, Unrealized Losses	315	1,621
12 Months or More, Fair Value	24,197	451
12 Months or More, Unrealized Losses	703	2
Investment Securities Held-to-Maturity:
Less Than 12 Months, Fair Value	9,824	20,429
Less Than 12 Months, Unrealized Losses	133	251
12 Months or More, Fair Value	3,542	2,564
12 Months or More, Unrealized Losses	94	101
Taxable Municipal Securities
Investment Securities Available-for-Sale:
Less Than 12 Months, Fair Value	11,068	9,721
Less Than 12 Months, Unrealized Losses	114	82
12 Months or More, Fair Value	1,032	450
12 Months or More, Unrealized Losses	8	3
Investment Securities Held-to-Maturity:
Less Than 12 Months, Fair Value	0	8,030
Less Than 12 Months, Unrealized Losses	0	217
12 Months or More, Fair Value	3,205	0
12 Months or More, Unrealized Losses	95	0
Mutual funds
Investment Securities Available-for-Sale:
Less Than 12 Months, Fair Value	0	1,205
Less Than 12 Months, Unrealized Losses	0	37
12 Months or More, Fair Value	1,519	277
12 Months or More, Unrealized Losses	46	8
Trust preferred securities
Investment Securities Available-for-Sale:
Less Than 12 Months, Fair Value	0	49
Less Than 12 Months, Unrealized Losses	0	1
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Equity securities
Investment Securities Available-for-Sale:
Less Than 12 Months, Fair Value	119	201
Less Than 12 Months, Unrealized Losses	2	10
12 Months or More, Fair Value	17	0
12 Months or More, Unrealized Losses	$ 2	$ 0