INVESTMENT SECURITIES - AFS (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2008
Securities available for sale:
Amortized Cost	$ 524,061	$ 479,825
Gross Unrealized Gains	4,465	4,310
Gross Unrealized Losses	(2,256)	(2,860)
Fair Value	526,270	481,275
U.S. Treasury securities and U.S. Government agencies
Securities available for sale:
Amortized Cost	320,381	295,425
Gross Unrealized Gains	92	226
Gross Unrealized Losses	(948)	(1,107)
Fair Value	319,525	294,544
Private label mortgage backed security
Securities available for sale:
Amortized Cost	3,543	3,691
Gross Unrealized Gains	1,139	1,086
Fair Value	4,682	4,777
Mortgage backed securities - residential
Securities available for sale:
Amortized Cost	95,857	71,197
Gross Unrealized Gains	2,191	2,027
Gross Unrealized Losses	(226)	(220)
Fair Value	97,822	73,004
Collateralized mortgage obligations
Securities available for sale:
Amortized Cost	83,317	88,559
Gross Unrealized Gains	394	334
Gross Unrealized Losses	(780)	(1,239)
Fair Value	82,931	87,654
Freddie Mac preferred stock
Securities available for sale:
Gross Unrealized Gains	394	483
Fair Value	394	483	$ 0
Community Reinvestment Act mutual fund
Securities available for sale:
Amortized Cost	2,500	2,500
Gross Unrealized Losses	(42)	(45)
Fair Value	2,458	2,455
Corporate bonds
Securities available for sale:
Amortized Cost	15,003	15,004
Gross Unrealized Gains	255	154
Fair Value	15,258	15,158
Trust preferred security
Securities available for sale:
Amortized Cost	3,460	3,449
Gross Unrealized Losses	(260)	(249)
Fair Value	$ 3,200	$ 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
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