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Transactions with Executive Officers, Directors, and Principal Shareholders - Schedule of Activity Relating to Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loans and Leases Receivable, Related Parties [Roll Forward]      
Balance as of December 31, $ 0 $ 238 $ 220
Additions 27 99 1,160
Repayments (22) (337) (1,142)
Balance as of December 31, $ 5 $ 0 $ 238