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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
9 Months Ended
Sep. 30, 2021
Sep. 30, 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 12,664 (500)
Net realized and unrealized gains or losses included in OCI (178) (683)
Sales (11,382) (4,960)
Balance at September 30, 49,953 31,160
Changes in unrealized gains (losses) included in earnings related to assets still held at period end 2,298 (7,056)
Changes in unrealized gains (losses) included in OCI related to assets still held at period end (178) (683)
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 (83,976) (86,325)
Interest rate lock commitments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Origination of IRLCs 84,034 90,474
Purchases $ 15,336 $ 684