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Fair Value Measurements Financial Instruments Classified Within Level 3 (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Interest rate lock commitments to originate residential mortgage loans held for sale    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning Balance $ 9,624 $ 2,527
New production 16,629 72,659
Closed loans / settlements (14,186) (76,001)
Other (5,151) 10,439
Mortgage derivative gain (loss) (2,708) 7,097
Ending Balance 6,917 9,624
Forward commitments to sell residential mortgage loans    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning Balance 2,046 710
New production (1,203) (3,505)
Closed loans / settlements 2,501 (12,587)
Other (7,598) 17,427
Mortgage derivative gain (loss) (6,300) 1,335
Ending Balance (4,255) 2,046
Total derivatives    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning Balance 7,579 1,817
New production 17,832 76,164
Closed loans / settlements (16,687) (63,414)
Other 2,447 (6,988)
Mortgage derivative gain (loss) 3,593 5,762
Ending Balance $ 11,171 $ 7,579