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Investment Securities - Information Related to Sales of Securities Available-for-Sale (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Securities available-for-sale:    
Proceeds from sales $ 3,115 $ 63,565
Gross realized gains on sales 119 774
Gross realized losses on sales 0 14
Tax expense related to net realized gains on sales $ 25 $ 160