Derivative Financial Instruments - Schedule of Effects of Interest Rate Swap Agreements on Consolidated Statements of Income (Detail) - Designated as Hedging Instrument [Member] - Interest Rate Swap [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Loans, Including Fees [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Effects of derivatives on consolidated statement of income	$ (24)	$ (14)
Other [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Effects of derivatives on consolidated statement of income	25	211
Interest Income [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Effects of derivatives on consolidated statement of income	$ 1	$ 197