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Investment Securities - Information Related to Sales of Securities Available-for-Sale (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Securities available-for-sale:    
Proceeds from sales $ 15,494 $ 1,010
Gross realized gains on sales 29 10
Gross realized losses on sales 21 0
Tax expense related to net realized gains on sales $ 2 $ 2