Commitments, Credit Risk, and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Summary of the contractual amount of commitments
Contractual amount of commitments, Total	$ 162,473	$ 178,683
Commitments to Extend Credit [Member]
Summary of the contractual amount of commitments
Contractual amount of commitments, Total	78,859	92,128
Home Equity Lines of Credit [Member]
Summary of the contractual amount of commitments
Contractual amount of commitments, Total	75,279	78,410
Standby Letters of Credit [Member]
Summary of the contractual amount of commitments
Contractual amount of commitments, Total	$ 8,335	$ 8,145