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Mortgage Servicing Rights and Mortgage Servicing Activity (Details Textual) (USD $)
12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2013
Residential Mortgage
Dec. 31, 2012
Residential Mortgage
Dec. 31, 2011
Residential Mortgage
Servicing Assets at Fair Value [Line Items]              
Principal Amount Outstanding of Loans Held-in-portfolio $ 562,300,000 $ 745,400,000          
Mortgage Servicing rights Valuation Allowance (282,000) (2,564,000) (3,539,000) 0      
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale, Gain (Loss) on Sale 12,100,000 12,100,000          
Qualitative and Quantitative Information, Transferor's Continuing Involvement, Principal Amount Outstanding, Continued Recognition, Amount 514,600,000 710,600,000          
Servicing Asset         2,700,000,000 2,400,000,000  
Contractually Specified Servicing Fees, Amount         $ 6,400,000 $ 5,800,000 $ 5,400,000
Minimum percentage adverse change in prepayment speed 10.00%            
Maximum percentage adverse change in prepayment speed 25.00%            
Percentage of variation in prepayment speed 10.00%