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Fair Value Measurements Notional Amount of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Notional Disclosures [Abstract]    
Whole loan contracts and related committed IRLCs $ 5,294 $ 2,354
Uncommitted IRLCs 273,470 208,500
FMBSs related to uncommitted IRLCs 258,000 183,000
Whole loan contracts and related mortgage loans held for sale 6,813 78,142
FMBSs related to mortgage loans held for sale 192,000 131,000
Mortgage loans held for sale covered by FMBSs $ 192,672 $ 148,331