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Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Unrealized gain (loss) on available-for-sale securities, Pre-Tax Amount $ 7,850 $ (31,602) $ (6,695)
Reclassification adjustment for gains (losses) realized in net income, Pre-Tax Amount 547 (3,037) (2,776)
Net unrealized gain loss, Pre-Tax Amount 8,397 (34,639) (9,471)
Other comprehensive income (loss), Pre-Tax Amount 8,397 (34,639) (9,471)
Unrealized gain loss on available-for-sale securities, Tax Expense (Benefit) 1,648 (6,636) (1,406)
Reclassification adjustment for gains (losses) realized in net income, Tax Expense (Benefit) 115 (638) (583)
Net unrealized gain loss, Tax Expense (Benefit) 1,763 (7,274) (1,989)
Other comprehensive income (loss), Tax Expense (Benefit) 1,763 (7,274) (1,989)
Unrealized gain (loss) on available-for-sale securities, Net-of-Tax Amount 6,202 (24,966) (5,289)
Reclassification adjustment for gains (losses) realized in net income, Net-of-Tax Amount 432 (2,399) (2,193)
Net unrealized gain loss, Net-of-Tax Amount 6,634 (27,365) (7,482)
Other comprehensive income (loss), Net-of-Tax Amount $ 6,634 $ (27,365) $ (7,482)