Investment Securities - Amortized cost and approximate fair values of securities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 118,827	$ 122,730
Gross Unrealized Gains	1,224	1,148
Gross Unrealized Losses	(2,718)	(3,991)
Fair Value	117,333	119,887
Federal agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	33,976	38,075
Gross Unrealized Gains	189	224
Gross Unrealized Losses	(827)	(1,086)
Fair Value	33,338	37,213
State and municipal
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	34,716	37,709
Gross Unrealized Gains	868	748
Gross Unrealized Losses	(570)	(1,335)
Fair Value	35,014	37,122
Government-sponsored enterprise (GSE) residential mortgage-backed and other asset-backed agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	46,477	42,782
Gross Unrealized Gains	164	176
Gross Unrealized Losses	(1,012)	(1,157)
Fair Value	45,629	41,801
Corporate
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,658	4,164
Gross Unrealized Gains	3
Gross Unrealized Losses	(309)	(413)
Fair Value	$ 3,352	$ 3,751