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Mortgage Servicing - Schedule of Activity Related to MSRs - Amortization Method (Footnote) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 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  
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