Quarterly report pursuant to Section 13 or 15(d)

Selected Balance Sheet Data - Summary of Net Change in Carrying Value of MSRs (Detail)

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Selected Balance Sheet Data - Summary of Net Change in Carrying Value of MSRs (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Servicing Asset at Amortized Cost, Balance [Roll Forward]    
Beginning balance $ 2,209 $ 0
Additions from acquisition 0 2,121
Additions 243 391
Amortization (413) (303)
Ending balance $ 2,039 $ 2,209