INVESTMENT SECURITIES - INVESTMENT CATEGORY (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Available-for-sale debt securities
Less than 12 months Fair Value	$ 33,770	$ 140,863
Less than 12 months Unrealized Losses	(427)	(2,497)
12 months or more Fair Value	184,043	169,210
12 months or more Unrealized Losses	(1,893)	(2,503)
Total Fair Value	217,813	310,073
Total Unrealized Losses	$ (2,320)	$ (5,000)
Number of securities held	172	182
Number of securities held in an unrealized loss position	47	65
Maximum percentage of holdings of securities of any one issuer, other than the U.S. Government and its agencies	10.00%	10.00%
Held-to-maturity debt securities
Less than 12 months Fair Value	$ 4,892	$ 39,604
Less than 12 months Unrealized Losses	(50)	(515)
12 months or more Fair Value	5,850	5,886
12 months or more Unrealized Losses	(26)	(56)
Total Fair Value	10,742	45,490
Total Unrealized Losses	(76)	(571)
U.S. Treasury securities and U.S. Government agencies
Available-for-sale debt securities
Less than 12 months Fair Value	19,740	71,627
Less than 12 months Unrealized Losses	(116)	(598)
12 months or more Fair Value	98,962	106,136
12 months or more Unrealized Losses	(688)	(1,056)
Total Fair Value	118,702	177,763
Total Unrealized Losses	(804)	(1,654)
Mortgage backed securities - residential
Available-for-sale debt securities
Less than 12 months Fair Value		43,691
Less than 12 months Unrealized Losses		(484)
12 months or more Fair Value	51,604	32,003
12 months or more Unrealized Losses	(533)	(769)
Total Fair Value	51,604	75,694
Total Unrealized Losses	(533)	(1,253)
Collateralized mortgage obligations
Available-for-sale debt securities
Less than 12 months Fair Value	4,336	16,487
Less than 12 months Unrealized Losses	(5)	(473)
12 months or more Fair Value	33,477	31,071
12 months or more Unrealized Losses	(672)	(678)
Total Fair Value	37,813	47,558
Total Unrealized Losses	(677)	(1,151)
Held-to-maturity debt securities
12 months or more Fair Value	5,393	5,539
12 months or more Unrealized Losses	(20)	(46)
Total Fair Value	5,393	5,539
Total Unrealized Losses	(20)	(46)
Corporate bonds
Available-for-sale debt securities
Less than 12 months Fair Value	9,694	9,058
Less than 12 months Unrealized Losses	(306)	(942)
Total Fair Value	9,694	9,058
Total Unrealized Losses	(306)	(942)
Held-to-maturity debt securities
Less than 12 months Fair Value	4,892	39,499
Less than 12 months Unrealized Losses	(50)	(514)
Total Fair Value	4,892	39,499
Total Unrealized Losses	(50)	(514)
Obligations of state and political subdivisions
Held-to-maturity debt securities
Less than 12 months Fair Value		105
Less than 12 months Unrealized Losses		(1)
12 months or more Fair Value	457	347
12 months or more Unrealized Losses	(6)	(10)
Total Fair Value	457	452
Total Unrealized Losses	$ (6)	$ (11)