Commitments and Contingencies (Details) (USD $)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Transaction	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2005
Schedule of Equity Method Investments [Line Items]
Loss contingency accrual	$ 0	$ 1,650,000	$ 0	$ 1,650,000	$ 0	$ 2,000,000
Percentage of entity's share in loss contingency (in hundredths)		60.00%				60.00%
Loss contingency, entity's share amount		990,000				1,200,000
Payments to acquire collateralized debt obligation offered by Lehman Brothers, Inc.							25,000,000
Number of separate CDO transactions improperly paid to note holders				47
CSL [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of equity interest hold (in hundredths)	60.00%			60.00%
RTL [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of equity interest hold (in hundredths)	60.00%			60.00%
Open-end lines of credit [Member]
Contracts of financial instruments represent credit risk [Abstract]
Financial instruments whose contract amounts represent credit risk				28,402,000		20,515,000
Commitments to Extend Credit [Member]
Contracts of financial instruments represent credit risk [Abstract]
Financial instruments whose contract amounts represent credit risk				14,092,000		24,030,000
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				$ 2,829,000		$ 1,199,000