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Mortgage Servicing - Schedule of Activity Related to MSRs - Amortization Method (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Servicing Asset at Amortized Cost, Balance [Roll Forward]        
Estimated fair value at end of period $ 625,650 $ 700,668 $ 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 1,657 12,432    
Additions recognized on the sale of mortgage loans 15,032 16,668    
Sales (1,066) 178    
Servicing transfers and adjustments 252 0    
Servicing asset at amortized value, gross 379,597 406,657    
Amortization (25,412) (21,153)    
Increase in impairment valuation allowance (4,650) (39,030)    
Ending balance 349,535 346,474    
Estimated fair value at end of period $ 440,311 $ 367,951