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Investment Securities - Information Related to Sales of Securities Available-for-Sale (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Securities available-for-sale:      
Proceeds from sales $ 26,494 $ 1,010 $ 7,069
Gross realized gains on sales 78 10 74
Gross realized losses on sales 24 0 26
Tax expense related to net realized gains on sales $ 11 $ 2 $ 17