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Investment Securities - Information Related to Sales of Securities Available-for-Sale (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Securities available-for-sale:    
Proceeds from sales $ 62,276 $ 491
Gross realized gains on sales 709 1
Gross realized losses on sales 14 0
Tax expense related to net realized gains on sales $ 146 $ 0