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Mortage Servicing Rights - Additional Information (Detail)
$ in Thousands
2 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Servicing Assets at Fair Value [Line Items]      
Temporary impairment charge of mortgage servicing rights $ (710) $ (710) $ (710)
Mortgage servicing rights     20,123
Mortgage Servicing Rights [Member]      
Servicing Assets at Fair Value [Line Items]      
Loans serviced for others unpaid principal balance $ 3,552,292 $ 3,552,292 $ 3,552,292
Net servicing fee percentage 0.26% 0.26% 0.26%
Temporary impairment charge of mortgage servicing rights     $ (710)
Mortgage servicing rights   $ 20,123 $ 20,123
Mortgage Servicing Rights [Member] | Minimum [Member]      
Servicing Assets at Fair Value [Line Items]      
Discount rate used in estimating the fair value of servicing rights     10.50%
Weighted average prepayment rates used in estimating the fair value of servicing rights     10.63%
Deliquency rate used in determning fair value of servicing rights     7.08%
Mortgage Servicing Rights [Member] | Maximum [Member]      
Servicing Assets at Fair Value [Line Items]      
Discount rate used in estimating the fair value of servicing rights     12.91%
Weighted average prepayment rates used in estimating the fair value of servicing rights     14.40%
Deliquency rate used in determning fair value of servicing rights     15.66%
Mortgage Servicing Rights [Member] | Weighted Average [Member]      
Servicing Assets at Fair Value [Line Items]      
Deliquency rate used in determning fair value of servicing rights     3.78%
Mortgage Servicing Rights [Member] | Loan Origination Commitments [Member] | Median [Member]      
Servicing Assets at Fair Value [Line Items]      
Estimated fair value of mortgage servicing rights $ 20,200 $ 20,200 $ 20,200