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Significant Accounting Policies - Schedule of Loan Servicing Rights Recognized (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Servicing Asset At Fair Value Amount Roll Forward    
Beginning balance, mortgage servicing rights $ 424,470 $ 373,131
Mortgage servicing rights recognized 182,443 173,737
Amortization expense (123,008) (115,743)
Other (413) (6,655)
Ending balance, mortgage servicing rights $ 483,492 $ 424,470