Annual report pursuant to Section 13 and 15(d)

Fair Value, Quantitative Information about Level 3 Fair Value Measurements (Details)

v3.6.0.2
Fair Value, Quantitative Information about Level 3 Fair Value Measurements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Mortgage servicing rights, at fair value $ 693,815 $ 493,688 $ 452,006 $ 514,402
Fair Value Measurements, Valuation Processes, Description Discounted cash flow Discounted cash flow    
Fair Value Inputs, Prepayment Rate 9.20% 11.80%    
Fair Value Inputs, Probability of Default 1.90% 4.00%    
Fair Value Inputs, Discount Rate 9.40% 10.10%    
Minimum [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Fair Value Inputs, Prepayment Rate 8.00% 9.60%    
Fair Value Inputs, Probability of Default 1.80% 3.70%    
Fair Value Inputs, Discount Rate 8.40% 8.70%    
Maximum [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Fair Value Inputs, Prepayment Rate 10.30% 13.50%    
Fair Value Inputs, Probability of Default 2.10% 4.20%    
Fair Value Inputs, Discount Rate 10.20% 11.20%