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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
Jan. 01, 2018
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Servicing Asset at Amortized Cost [Line Items]        
Cumulative effect of fair value election   $ 0 $ 82,043  
Tax effect of adjustment on retained earnings $ 6,800      
Mortgage Servicing Rights - Amortized Costs [Member]        
Servicing Asset at Amortized Cost [Line Items]        
Decrease in impairment valuation allowance 24,800     $ 24,788
Retained Earnings [Member]        
Servicing Asset at Amortized Cost [Line Items]        
Cumulative effect of fair value election     $ 82,043  
Retained Earnings [Member] | Fair Value Agency Mortgage Servicing Rights [Member]        
Servicing Asset at Amortized Cost [Line Items]        
Cumulative effect of fair value election $ 82,043 $ 0