Annual report pursuant to Section 13 and 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 ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]      
Gross realized gains on sales of securities     $ 99,000
Gross realized losses on sales of securities $ (1,871,000)   (598,000)
Net realized gains (losses) on sales of securities (1,871,000)   (499,000)
Proceeds from sales of securities $ 8,149,000 $ 0 $ 55,884,000