Quarterly report pursuant to Section 13 or 15(d)

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 ($)
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
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 $ 0 $ 8,149,000