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Securities - Information Pertaining to Security Sales (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]      
Proceeds $ 11,403 $ 0 $ 16,340
Gross Gains 152 0 1,614
Gross Losses $ 4 $ 0 $ 71