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Loan Sales and Servicing - Valuation Assumptions (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Servicing Assets at Fair Value [Line Items]    
Fair value of MSRs $ 28,731 $ 42,022
Composition of residential loans serviced for others, percentage 100.00% 100.00%
Weighted average life (in years) 3 years 5 months 13 days 4 years 7 months 10 days
Prepayment speed: 29.50% 16.90%
Effect on fair value of a 10% increase $ (1,478) $ (2,906)
Effect on fair value of a 20% increase $ (3,236) $ (5,043)
Weighted average option adjusted spread: 6.20% 6.40%
Effect on fair value of a 10% increase $ (670) $ (1,159)
Effect on fair value of a 20% increase $ (1,310) $ (1,812)
Fixed rate mortgage loans    
Servicing Assets at Fair Value [Line Items]    
Composition of residential loans serviced for others, percentage 98.40% 98.10%
Adjustable rate mortgage loans    
Servicing Assets at Fair Value [Line Items]    
Composition of residential loans serviced for others, percentage 1.60% 1.90%