Amount of the cumulative effect on retained earnings net of related income tax effect.

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Amount of increase (decrease) in the amortized amount from a decrease (increase) in the valuation allowance applied to the servicing asset for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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Mortgage Servicing - Summary of Activity in Carrying Value of Amortization Method Servicing Assets (Footnote) (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2018	Dec. 31, 2017
Fair Value Agency Mortgage Servicing Rights \| Retained Earnings (Accumulated Deficit)
Servicing Asset at Amortized Cost [Line Items]
Cumulative effect of fair value election	$ 82,000	$ 82,043
Mortgage Servicing Rights - Amortized Costs
Servicing Asset at Amortized Cost [Line Items]
Valuation allowance of MSRs		$ 24,788	$ 3,366
Mortgage Servicing Rights - Amortized Costs \| Retained Earnings (Accumulated Deficit)
Servicing Asset at Amortized Cost [Line Items]
Tax effect of adjustment on retained earnings	$ 6,800
Impaired Government Insured Stratum
Servicing Asset at Amortized Cost [Line Items]
Valuation allowance of MSRs			$ 24,800