Investment Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Gross Unrealized Losses and the Fair Value of the Associated Securities by Type and Maturity for Securities Available for Sale
Estimated fair value, less than 12 months	$ 8,863	$ 16,044
Unrealized losses, less than 12 months	25	56
Estimated fair value, 12 months or more	1,595	1,854
Unrealized losses, 12 months or more	68	82
Estimated fair value, Total	10,458	17,898
Unrealized losses, Total	93	138
U.S. Government agency [Member]
Gross Unrealized Losses and the Fair Value of the Associated Securities by Type and Maturity for Securities Available for Sale
Estimated fair value, less than 12 months	4,987	16,044
Unrealized losses, less than 12 months	13	56
Estimated fair value, 12 months or more	0	0
Unrealized losses, 12 months or more	0	0
Estimated fair value, Total	4,987	16,044
Unrealized losses, Total	13	56
Residential mortgage-backed securities [Member]
Gross Unrealized Losses and the Fair Value of the Associated Securities by Type and Maturity for Securities Available for Sale
Estimated fair value, less than 12 months	3,876	0
Unrealized losses, less than 12 months	12	0
Estimated fair value, 12 months or more	1,595	1,854
Unrealized losses, 12 months or more	68	82
Estimated fair value, Total	5,471	1,854
Unrealized losses, Total	$ 80	$ 82