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Fair Value of Financial Instruments - Schedule of Level 3 Rollforward, Assets Measured on Recurring Basis Utilizing Level 3 Inputs (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at January 1, $ 33,455 $ 32,470
Net realized and unrealized gains or losses included in earnings 7,015 (4,332)
Net realized and unrealized gains or losses included in OCI 20 (649)
Sales (1,743) (1,753)
Balance at March 31, 38,392 29,500
Changes in unrealized gains (losses) included in earnings related to assets still held at period end 2,390 (6,519)
Changes in unrealized gains (losses) included in OCI related to assets still held at period end 20 (649)
Conversion to mortgage held for sale    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Conversions to mortgage loans held for sale (27,270) (24,116)
Interest rate lock commitments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Issuances 26,347 27,880
Purchases $ 568 $ 0