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Mortgage Servicing Rights - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Mortgage Servicing Rights [Abstract]          
Mortgage servicing rights portfolio $ 397,200   $ 397,200   $ 377,300
Mortgage Servicing Right, Key Economic Assumptions [Abstract]          
Prepayment speed (Public Securities Association “PSA” model)     216.00%   187.00%
Weighted-average life     5 years 6 months 6 years 2 months 12 days  
Discount rate     10.10% 12.50%  
Mortgage servicing income 235 $ 256 $ 479 $ 498  
Federal National Mortgage Association          
Mortgage Servicing Rights [Abstract]          
Loans serviced for others 385,900   385,900   $ 363,300
Other Financial Institutions          
Mortgage Servicing Rights [Abstract]          
Loans serviced for others $ 11,300   $ 11,300   $ 14,000