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Fair value of all liability derivatives designated as cash flow hedging instruments.

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Nominal or face amount used to calculate payments on the derivative asset.

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Average fixed interest rate that will be received or paid upon exercise of a group of interest rate swaption contracts.

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Fixed interest rate related to the interest rate derivative.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Nominal or face amount used to calculate payment on derivative.

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The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Derivative Financial Instruments - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026 USD ($) Agreement	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) Agreement	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)	Sep. 30, 2025	May 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Description of Conditions Relating to Clearing of Interest rate Swaps			provisions that require the posting of collateral when the fair value of the derivative exceeds certain agreed upon threshold limits
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net			$ 150,000
Net Income (Loss)	$ 48,261	$ 50,564	99,263	$ 101,668
Derivative, Gain (Loss) on Derivative, Net			293
Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total notional amount of the Company's swaps	700,000		700,000		$ 700,000
Derivative instruments totaled	$ 700,000		$ 700,000		$ 700,000
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Interest Rate	4.10%		4.10%
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value								$ 300,000
Interest Rate Swap Agreements With Customers [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest-rate swap agreements \| Agreement	97		97
Total notional amount of the Company's swaps	$ 277,600		$ 277,600
Interest Rate Swaps [Member] \| Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total notional amount of the Company's swaps							$ 700,000
Derivative Fixed Interest Rate						3.68%	3.70%
Interest Rate Swaps [Member] \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total notional amount of the Company's swaps								$ 300,000