Servicing Assets (Fair Value Assumptions) (Details)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
SBA Servicing Assets:
Weighted-average discount rate	9.19%	11.23%
Constant prepayment rate	14.17%	11.09%
Mortgage Servicing Assets:
Weighted-average discount rate	9.25%	10.25%
Constant prepayment rate	9.57%	7.13%

Mortgage Servicing Assets And Servicing Liabilities [Abstract]

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Mortgage Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate

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Mortgage Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed

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SBA Servicing Assets And Servicing Liabilities [Abstract]

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SBA Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate

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SBA Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed

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