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Mortgage Servicing Rights (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Mortgage Servicing Rights (Textual)    
Unpaid principal balance of mortgage loans $ 528,100,000 $ 402,100,000
Contractually specified servicing fees, late fees and ancillary fees 1,100,000 900,000
Valuation allowance taken to adjust carrying value of the impaired MSRs to the fair value for indicated tranches $ 309,000 $ (1,119,000)