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Derivative Financial Instruments - Effect of Derivative Instruments on Consolidated Statement of Earnings (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net, Total			$ 64
Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Amount of Gains (Losses) Recognized in Net Interest Income on Derivative Instruments	$ 4	$ 0	45	$ 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	4	0	45	0
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net, Total	(499)	1,467	(1,444)	4,105
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	(165)	1,299	(410)	3,607
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	$ (334)	$ 168	$ (1,034)	$ 498