INVESTMENT SECURITIES - AFS (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2008
Securities available for sale:
Amortized Cost	$ 526,612	$ 479,825
Gross Unrealized Gains	4,063	4,310
Gross Unrealized Losses	(3,444)	(2,860)
Fair Value	527,231	481,275
U.S. Treasury securities and U.S. Government agencies
Securities available for sale:
Amortized Cost	309,042	295,425
Gross Unrealized Gains	1	226
Gross Unrealized Losses	(1,451)	(1,107)
Fair Value	307,592	294,544
Private label mortgage backed security
Securities available for sale:
Amortized Cost	3,065	3,691
Gross Unrealized Gains	1,384	1,086
Fair Value	4,449	4,777
Mortgage backed securities - residential
Securities available for sale:
Amortized Cost	105,644	71,197
Gross Unrealized Gains	1,603	2,027
Gross Unrealized Losses	(873)	(220)
Fair Value	106,374	73,004
Collateralized mortgage obligations
Securities available for sale:
Amortized Cost	87,867	88,559
Gross Unrealized Gains	371	334
Gross Unrealized Losses	(1,075)	(1,239)
Fair Value	87,163	87,654
Freddie Mac preferred stock
Securities available for sale:
Gross Unrealized Gains	473	483
Fair Value	473	483	$ 0
Community Reinvestment Act mutual fund
Securities available for sale:
Amortized Cost	2,500	2,500
Gross Unrealized Losses	(45)	(45)
Fair Value	2,455	2,455
Corporate bonds
Securities available for sale:
Amortized Cost	15,001	15,004
Gross Unrealized Gains	124	154
Fair Value	15,125	15,158
Trust preferred security
Securities available for sale:
Amortized Cost	3,493	3,449
Gross Unrealized Gains	107
Gross Unrealized Losses		(249)
Fair Value	$ 3,600	$ 3,200

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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