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Loan Sales and Servicing - Valuation Assumptions (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Servicing Assets at Fair Value [Line Items]    
Fair value of MSRs $ 31,232 $ 42,022
Composition of residential loans serviced for others, percentage 100.00% 100.00%
Weighted average life (in years) 3 years 8 months 1 day 4 years 7 months 10 days
Prepayment speed: 16.60% 16.90%
Effect on fair value of a 10% increase $ (1,888) $ (2,906)
Effect on fair value of a 20% increase $ (3,578) $ (5,043)
Weighted average option adjusted spread: 6.20% 6.40%
Effect on fair value of a 10% increase $ (633) $ (1,159)
Effect on fair value of a 20% increase $ (1,241) $ (1,812)
Fixed rate mortgage loans    
Servicing Assets at Fair Value [Line Items]    
Composition of residential loans serviced for others, percentage 98.20% 98.10%
Adjustable rate mortgage loans    
Servicing Assets at Fair Value [Line Items]    
Composition of residential loans serviced for others, percentage 1.80% 1.90%