Annual report [Section 13 and 15(d), not S-K Item 405]

Securities - Realized Gains and Losses on Sales of Investment Securities (Detail)

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Securities - Realized Gains and Losses on Sales of Investment Securities (Detail) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]      
Gross realized losses on sales of securities   $ (1,871,000)  
Net realized gains (losses) on sales of securities   (1,871,000)  
Proceeds from sales of securities $ 0 $ 8,149,000 $ 0