Fair Value Measurements - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Transfers between Level 1, Level 2 and Level 3 securities	$ 0	$ 0
Cash collateral deposit	0
Notional value	94,197,000	64,454,000
Proceeds from the sales and maturities of securities available-for-sale	85,600,000	62,400,000
Purchases of investments	87,800,000	93,400,000
Credit losses on available-for-sale securities	0	$ 0	$ 0
Interest Rate Swap [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Notional value	$ 0