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Fair Value Measurements Financial Instruments Classified Within Level 3 (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
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 $ 2,527 $ 2,208
New production 59,550 24,164
Closed loans / settlements (60,000) (29,375)
Other 5,703 5,530
Mortgage derivative gain (loss) 5,253 319
Ending Balance 7,780 2,527
Forward commitments to sell residential mortgage loans    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning Balance 710 2,072
New production (1,790) (2,367)
Closed loans / settlements (14,169) (5,968)
Other 15,140 6,973
Mortgage derivative gain (loss) (819) (1,362)
Ending Balance (108) 710
Total derivatives    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning Balance 1,817 140
New production 61,340 26,531
Closed loans / settlements (45,831) (23,407)
Other (9,437) (1,443)
Mortgage derivative gain (loss) 6,072 1,681
Ending Balance $ 7,888 $ 1,817