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Mortgage Servicing - Schedule of Activity Related to MSRs - Amortization Method (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Servicing Asset at Amortized Cost, Balance [Roll Forward]        
Estimated fair value at end of period $ 651,987 $ 732,174 $ 679,256 $ 761,190
Mortgage Servicing Rights - Amortized Costs [Member]        
Servicing Asset at Amortized Cost, Balance [Roll Forward]        
Beginning balance 363,722 377,379    
Additions recognized in connection with asset acquisitions 1,229 4,263    
Additions recognized on the sale of mortgage loans 8,126 7,156    
Sales (430) 0    
Servicing asset at amortized value, gross 372,647 388,798    
Amortization (12,715) (12,806)    
Increase in impairment valuation allowance [1] (1,401) (29,953)    
Ending balance 358,531 346,039    
Estimated fair value at end of period $ 462,289 $ 390,970    
[1] Impairment of MSRs is recognized in Servicing and origination expense in the unaudited consolidated statements of operations. See Note 3 – Fair Value for additional information regarding impairment and the valuation allowance.