INVESTMENT SECURITIES - AFS (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2008
Securities available for sale:
Amortized Cost	$ 484,323	$ 513,305
Gross Unrealized Gains	6,188	5,497
Gross Unrealized Losses	(606)	(1,744)
Fair Value	489,905	517,058
U.S. Treasury securities and U.S. Government agencies
Securities available for sale:
Amortized Cost	286,295	286,914
Gross Unrealized Gains	1,350	59
Gross Unrealized Losses		(494)
Fair Value	287,645	286,479
Private label mortgage backed security
Securities available for sale:
Amortized Cost	3,864	4,037
Gross Unrealized Gains	1,004	1,095
Fair Value	4,868	5,132
Mortgage backed securities - residential
Securities available for sale:
Amortized Cost	78,048	88,968
Gross Unrealized Gains	2,814	3,395
Gross Unrealized Losses	(30)	(95)
Fair Value	80,832	92,268
Collateralized mortgage obligations
Securities available for sale:
Amortized Cost	95,173	113,972
Gross Unrealized Gains	660	748
Gross Unrealized Losses	(238)	(1,052)
Fair Value	95,595	113,668
Freddie Mac preferred stock
Securities available for sale:
Gross Unrealized Gains	193	173
Fair Value	193	173	$ 0
Community Reinvestment Act mutual fund
Securities available for sale:
Amortized Cost	2,500	1,000
Gross Unrealized Gains	44	11
Fair Value	2,544	1,011
Corporate bonds
Securities available for sale:
Amortized Cost	15,005	15,009
Gross Unrealized Gains	123	16
Gross Unrealized Losses		(103)
Fair Value	15,128	14,922
Trust preferred security
Securities available for sale:
Amortized Cost	3,438	3,405
Gross Unrealized Losses	(338)
Fair Value	$ 3,100	$ 3,405

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
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