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
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Servicing Asset at Amortized Cost, Balance [Roll Forward]    
Beginning balance $ 0 $ 0
Additions from acquisition 2,121 0
Additions 41 0
Amortization (41) 0
Ending balance $ 2,121 $ 0