INVESTMENT SECURITIES - AMORTIZED COST AND FV (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2008	May 17, 2016	Dec. 31, 2015
Securities available for Sale - Amortized Cost
Due in one year or less	$ 96,170,000		$ 96,170,000
Due from one year to five years	195,130,000		195,130,000
Due from five years to ten years	10,000,000		10,000,000
Due beyond ten years	3,438,000		3,438,000
Total securities	484,323,000		484,323,000
Securities available for Sale - Fair Value
Due in one year or less	96,479,000		96,479,000
Due from one year to five years	196,203,000		196,203,000
Due from five years to ten years	10,091,000		10,091,000
Due beyond ten years	3,100,000		3,100,000
Total securities	489,905,000		489,905,000
Securities held to maturity - Carrying Value
Due in one year or less	509,000		509,000
Due from one year to five years	5,075,000		5,075,000
Total securities	34,539,000		34,539,000				$ 38,727,000
Securities held to maturity - Fair Value
Due in one year or less	516,000		516,000
Due from one year to five years	4,990,000		4,990,000
Total securities	$ 34,651,000		$ 34,651,000				$ 39,196,000
Number of Securities Held	173		173				162
Securities available for sale	$ 489,905,000		$ 489,905,000				$ 517,058,000
Total unrealized gain	(788,000)	$ 488,000	1,920,000	$ 670,000
Private label mortgage backed security
Securities available for Sale - Amortized Cost
Securities not due at a single maturity date	3,864,000		3,864,000
Securities available for Sale - Fair Value
Securities not due at a single maturity date	$ 4,868,000		$ 4,868,000
Securities held to maturity - Fair Value
Number of Securities Held	1		1
Securities available for sale	$ 4,868,000		$ 4,868,000				5,132,000
Mortgage backed securities - residential
Securities available for Sale - Amortized Cost
Securities not due at a single maturity date	78,048,000		78,048,000
Securities available for Sale - Fair Value
Securities not due at a single maturity date	80,832,000		80,832,000
Securities held to maturity - Carrying Value
Securities not due at a single maturity date	160,000		160,000
Total securities	160,000		160,000				53,000
Securities held to maturity - Fair Value
Securities not due at a single maturity date	172,000		172,000
Total securities	172,000		172,000				59,000
Securities available for sale	80,832,000		80,832,000				92,268,000
Collateralized mortgage obligations
Securities available for Sale - Amortized Cost
Securities not due at a single maturity date	95,173,000		95,173,000
Securities available for Sale - Fair Value
Securities not due at a single maturity date	95,595,000		95,595,000
Securities held to maturity - Carrying Value
Securities not due at a single maturity date	28,795,000		28,795,000
Total securities	28,795,000		28,795,000				33,159,000
Securities held to maturity - Fair Value
Securities not due at a single maturity date	28,973,000		28,973,000
Total securities	28,973,000		28,973,000				33,623,000
Securities available for sale	95,595,000		95,595,000				113,668,000
Freddie Mac preferred stock
Securities available for Sale - Fair Value
Securities not due at a single maturity date	193,000		193,000
Securities held to maturity - Fair Value
Number of Securities Held					40,000
Other Than Temporary Impairment ("OTTI") charge					$ 2,100,000
Securities available for sale	193,000		193,000		$ 0		173,000
Total unrealized gain			193,000
Community Reinvestment Act mutual fund
Securities available for Sale - Amortized Cost
Securities not due at a single maturity date	2,500,000		2,500,000
Securities available for Sale - Fair Value
Securities not due at a single maturity date	2,544,000		2,544,000
Securities held to maturity - Fair Value
Securities available for sale	2,544,000		2,544,000				1,011,000
Corporate bonds
Securities held to maturity - Carrying Value
Total securities	5,075,000		5,075,000				5,000,000
Securities held to maturity - Fair Value
Total securities	4,990,000		4,990,000				4,998,000
Securities available for sale	$ 15,128,000		$ 15,128,000				$ 14,922,000
Corporate bonds as a percentage of bank's investment portfolio	4.00%		4.00%				4.00%
Corporate bonds | Cornerstone
Securities held to maturity - Fair Value
Portfolio of Corporate bonds						$ 75,000