Securities - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Debt Securities, Available-for-Sale [Line Items]
Sale of low yielding securities		$ 226,000,000
Debt securities. average yield percentage		0.16%
Reinvested in debt securities		$ 220,000,000
Reinvested debt securities, average yield percentage		1.86%
Proceeds from sales of available for sale securities	$ 0	$ 222,474,000
Avaliable for sale of debt securities realized gains or losses	$ 0