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Mortgage Servicing Rights - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Mortgage Servicing Rights [Abstract]          
Mortgage servicing rights portfolio $ 382,200   $ 382,200   $ 378,700
Mortgage Servicing Right, Key Economic Assumptions [Abstract]          
Prepayment speed (Public Securities Association PSA model)     196.00%   123.00%
Weighted-average life     6 years 16 days   7 years 7 months 30 days
Discount rate     12.50%   12.50%
Mortgage servicing income 259 $ 282 $ 756 $ 828  
Federal National Mortgage Association          
Mortgage Servicing Rights [Abstract]          
Loans serviced for others 366,700   366,700   $ 376,500
Other Financial Institutions          
Mortgage Servicing Rights [Abstract]          
Loans serviced for others $ 15,600   $ 15,600   $ 2,200