Investment Securities (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 item	Dec. 31, 2013	Dec. 31, 2012
Investment securities available for sale:
Amortized Cost	$ 200,758,000	$ 261,318,000
Unrealized Gain	1,667,000	609,000
Unrealized Loss	(787,000)	(5,838,000)
Total	201,638,000	256,089,000
Equities held at cost, Amortized Cost
FHLB stock	8,019,000	7,483,000
Federal Reserve Bank/TIB	9,048,000	7,967,000
Total equities held at cost	17,067,000	15,450,000
Equities held at cost, Estimated Fair Value
FHLB stock	8,019,000	7,483,000
FRB stock	9,048,000	7,967,000
Total equities held at cost	17,067,000	15,450,000
Total securities
Amortized Cost	217,825,000	276,768,000
Estimated Fair Value	218,705,000	271,539,000
Additional disclosures
Excess FHLB stock with the entity repurchased by FHLB through their stock repurchase program	3,400,000	4,300,000	4,300,000
Number of inverse putable reverse repurchase of the Bank's secured by collateral	3
Value of inverse putable reverse repurchases secured by collateral	28,500,000
Securities with OTTI	0
OTTI losses	(29,000)	4,000	159,000
U.S. Treasury
Investment securities available for sale:
Amortized Cost		73,000
Unrealized Gain		8,000
Total		81,000
Municipal bonds
Investment securities available for sale:
Amortized Cost	88,599,000	95,388,000
Unrealized Gain	1,235,000	589,000
Unrealized Loss	(173,000)	(1,850,000)
Total	89,661,000	94,127,000
Mortgage-backed securities
Investment securities available for sale:
Amortized Cost	112,159,000	165,857,000
Unrealized Gain	432,000	12,000
Unrealized Loss	(614,000)	(3,988,000)
Total	111,977,000	161,881,000
Additional disclosures
Estimated par value of securities pledged as collateral for the Bank's inverse putable reverse repurchases	33,500,000
Fair value of securities pledged as collateral for the Bank's inverse putable reverse repurchases	$ 35,000,000