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Securities Sold Under Agreements to Repurchase - Schedule of Securities Sold Under Agreements to Repurchase (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]      
Outstanding balance at year end $ 22,199 $ 21,755 $ 28,925
Average balance during the year $ 18,456 $ 18,234 $ 21,767
Average interest rate during the year 0.10% 0.10% 0.10%
Maximum month-end balance during the year $ 22,199 $ 23,889 $ 28,925
Weighted average interest rate at year end 0.10% 0.10% 0.10%