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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
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Fair Value, Mortgage Servicing Rights Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Fair Value, Mortgage Servicing Rights, Beginning Balance $ 958 $ 1,126
Fair Value, Mortgage Servicing Rights, Realized and Unrealized Net Gains (Losses) Included in Net Income (39) (25)
Fair Value, Mortgage Servicing Rights, Ending Balance 919 1,101
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 77,880 22,573
Fair Value, Net Derivative Assets and Liabilities, Realized and Unrealized Net Gains (Losses) Included in Net Income 874 6,172
Fair Value, Net Derivative Assets and Liabilities, Transfers to Loans Held for Sale (3,016) (3,653)
Variation margin payments for swap liabilities (60,256) 55,588
Fair Value, Net Derivative Assets and Liabilities, Ending Balance 15,482 80,680
Fair Value, Net Derivative Assets and Liabilities,Total Unrealized Net Gains (Losses) Included in Net Income Related to Assets Still Held $ 15,482 $ 80,680