Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Proceeds from the sales and maturities of securities available-for-sale			$ 7,500,000	$ 27,000,000
Purchases of investments			7,900,000	51,600,000
Transfers between Level 1, Level 2 and Level 3 securities			0	0
Realized loss on investments	$ 700,000			100,000
Net realized gain		$ 1,600,000	600,000
Unrealized gain on investments	700,000			2,300,000
Net unrealized loss		200,000	1,400,000
Credit losses on available-for-sale securities	$ 0	$ 0	$ 0	$ 0