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Selected Balance Sheet Data - Summary of Net Change in Carrying Value of MSRs (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Servicing Asset at Amortized Cost, Balance [Roll Forward]    
Beginning balance $ 1,897 $ 2,002
Additions 303 77
Amortization (138) (129)
Ending balance $ 2,062 $ 1,950