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Investment Securities (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2013
Securities (Assets) [Member]
Dec. 31, 2012
Securities (Assets) [Member]
Investment [Line Items]                
Available For Sale Equity Securites, Weighted Average Maturity               29 years 7 months 6 days
Available-for-sale Securities, Amortized Cost Basis             $ 10,000 $ 41,747
Available-for-sale Securities, Gross Unrealized Gain             0 223
Available-for-sale Securities, Gross Unrealized Loss             (520) (316)
Investment securities, at fair value 9,480   9,480   41,654 0 9,480 41,654
Gain on sale of investment securities $ 0 $ 0 $ 451 $ 0        
Available For Sale Equity Securites, Weighted Average Interest Rate               5.70%