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Securities Sold Under Agreements to Repurchase - Schedule of Securities Sold Under Agreements to Repurchase (Detail) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]      
Outstanding balance at year end $ 28,914,000 $ 18,674,000 $ 22,199,000
Average balance during the year $ 24,390,000 $ 18,321,000 $ 18,456,000
Average interest rate during the year 0.10% 0.10% 0.10%
Maximum month-end balance during the year $ 31,885,000 $ 21,970,000 $ 22,199,000
Weighted average interest rate at year end 0.10% 0.10% 0.10%