Commitments and Contingencies (Details) (USD $)	3 Months Ended			6 Months Ended				6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 CSL [Member]	Jun. 30, 2012 RTL [Member]	Jun. 30, 2012 Open-end lines of credit [Member]	Dec. 31, 2011 Open-end lines of credit [Member]	Jun. 30, 2012 Commitments to Extend Credit [Member]	Dec. 31, 2011 Commitments to Extend Credit [Member]	Jun. 30, 2012 Standby letters of credit and financial guarantees written [Member]	Dec. 31, 2011 Standby letters of credit and financial guarantees written [Member]
Contracts of financial instruments represent credit risk [Abstract]
Financial instruments whose contract amounts represent credit risk								$ 15,831,000	$ 13,600,000	$ 3,652,000	$ 7,073,000	$ 1,566,000	$ 2,594,000
Schedule of Equity Method Investments [Line Items]
Percentage of equity interest hold (in hundredths)						60.00%	60.00%
Loss contingency accrual	400,000	1,600,000	0	2,000,000	0
Percentage of entity's share in loss contingency (in hundredths)				60.00%
Loss contingency, entity's share amount	$ 1,200,000			$ 1,200,000