Investment Securities - Unrealized Loss on Investments (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 10,682	$ 9,006
Less than 12 Months, Unrealized Losses	(65)	(144)
12 Months or More Fair Value	1,197	1,863
12 Months or More Unrealized Losses	(522)	(675)
Total Fair Value	11,879	10,869
Total Unrealized Losses	(587)	(819)
Federal agencies
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	3,979	4,991
Less than 12 Months, Unrealized Losses	(21)	(34)
12 Months or More Fair Value
12 Months or More Unrealized Losses
Total Fair Value	3,979	4,991
Total Unrealized Losses	(21)	(34)
State and municipal
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	3,856	733
Less than 12 Months, Unrealized Losses	(34)	(20)
12 Months or More Fair Value		773
12 Months or More Unrealized Losses		(4)
Total Fair Value	3,856	1,506
Total Unrealized Losses	(34)	(24)
Government-sponsored enterprise (GSE) residential mortgage-backed and other asset-backed agency securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	2,847	1,012
Less than 12 Months, Unrealized Losses	(10)	(6)
12 Months or More Fair Value
12 Months or More Unrealized Losses
Total Fair Value	2,847	1,012
Total Unrealized Losses	(10)	(6)
Corporate
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value		2,270
Less than 12 Months, Unrealized Losses		(84)
12 Months or More Fair Value	1,197	1,090
12 Months or More Unrealized Losses	(522)	(671)
Total Fair Value	1,197	3,360
Total Unrealized Losses	$ (522)	$ (755)