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Fair Value of Assets and Liabilities - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Mortgage Servicing Rights Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Fair Value, Mortgage Servicing Rights, Beginning Balance $ 1,126 $ 1,290
Fair Value, Mortgage Servicing Rights, Realized and Unrealized Net Gains (Losses) Included in Net Income (168) (164)
Fair Value, Mortgage Servicing Rights, Ending Balance 958 1,126
Fair Value, Mortgage Service Rights, Total Unrealized Net Gains (Losses) Included in Net Income Related to Assets Still Held 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Fair Value, Net Derivative Assets and Liabilities, Beginning Balance 22,573 4,416
Fair Value, Net Derivative Assets and Liabilities, Realized and Unrealized Net Gains (Losses) Included in Net Income 22,219 12,138
Fair Value, Net Derivative Assets and Liabilities, Transfers to Loans Held for Sale (18,681) (11,776)
Variation margin payments for swap liabilities 51,769 17,795
Fair Value, Net Derivative Assets and Liabilities, Ending Balance 77,880 22,573
Fair Value, Net Derivative Assets and Liabilities,Total Unrealized Net Gains (Losses) Included in Net Income Related to Assets Still Held $ 77,880 $ 22,573