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Derivative Financial Instruments - Effect of Derivative Instruments on Consolidated Statement of Earnings (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net, Total			$ 293
Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Amount of Gains (Losses) Recognized in Net Interest Income on Derivative Instruments	$ 41	$ 0	41	$ 0
Derivatives Not Designated as Hedging Instruments [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Amount of Gains (Losses) Recognized in Net Interest Income on Derivative Instruments	41	0	41	0
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net, Total	(517)	1,419	(945)	2,639
Designated as Hedging Instrument [Member] \| Interest Rate Swaps [Member] \| Fair Value Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net, Total	(149)	1,257	(245)	2,309
Designated as Hedging Instrument [Member] \| Interest Rate Swaps [Member] \| Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net, Total	$ (368)	$ 162	$ (700)	$ 330