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Securities - Gross Realized Losses (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-Sale, Realized Gain (Loss) [Abstract]    
Gross realized losses   $ (891)
Net realized losses $ 0 (891)
Tax benefit related to net realized losses   $ (187)