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Loan Sales and Servicing - Valuation Assumptions (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Servicing Assets at Fair Value [Line Items]    
Fair value of MSRs $ 29,035 $ 42,022
Composition of residential loans serviced for others, percentage 100.00% 100.00%
Weighted average life (in years) 3 years 4 months 7 days 4 years 7 months 10 days
Prepayment speed: 21.10% 16.90%
Effect on fair value of a 10% increase $ (2,058) $ (2,906)
Effect on fair value of a 20% increase $ (3,891) $ (5,043)
Weighted average option adjusted spread: 6.20% 6.40%
Effect on fair value of a 10% increase $ (560) $ (1,159)
Effect on fair value of a 20% increase $ (1,098) $ (1,812)
Fixed rate mortgage loans    
Servicing Assets at Fair Value [Line Items]    
Composition of residential loans serviced for others, percentage 98.30% 98.10%
Adjustable rate mortgage loans    
Servicing Assets at Fair Value [Line Items]    
Composition of residential loans serviced for others, percentage 1.70% 1.90%