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Investment Securities - Information Related to Sales of Securities Available-for-Sale (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Securities available-for-sale:      
Proceeds from sales $ 66,421 $ 26,494 $ 1,010
Gross realized gains on sales 885 78 10
Gross realized losses on sales 14 24 0
Tax expense related to net realized gains on sales $ 183 $ 11 $ 2