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Mortgage Servicing - Schedule of Activity Related to MSRs - Amortization Method (Footnote) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2014
Servicing Asset at Amortized Cost [Line Items]          
Fair value measurement of non-agency MSRs, cumulative-effect on retained earnings     $ 0 $ 52,015  
Losses on claims filed $ 23,100        
Amortization of mortgage servicing rights (2,558) $ 18,108 $ 18,595 $ 88,188  
Non Agency Mortgage Servicing Rights [Member]          
Servicing Asset at Amortized Cost [Line Items]          
Fair value measurement of non-agency MSRs, cumulative-effect on retained earnings         $ 52,000
Deferred income taxes         9,200
Unpaid principal balance of MSRs         $ 195,300,000
Aged Delinquent Portfolio Loans [Member]          
Servicing Asset at Amortized Cost [Line Items]          
Amortization of mortgage servicing rights $ (18,100)