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Derivatives and Hedging Activities - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2026 USD ($) Derivative	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) Derivative	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($) Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Collateral posted with market value on liability positions with credit risk-related contingent features	$ 10,800,000		$ 10,800,000		$ 16,000,000
Interest Rate Swaps and Caps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of interest rate swaps \| Derivative	381		381		368
Aggregate notional amount	$ 2,700,000,000		$ 2,700,000,000		$ 2,600,000,000
Income (loss) on derivative instrument not designated hedges	$ 2,800,000	$ 1,400,000	$ 4,000,000	$ 3,400,000
Risk Participation in Agreements [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of interest rate swaps \| Derivative	26		26		26
Aggregate notional amount	$ 266,900,000		$ 266,900,000		$ 271,800,000
Risk Participation out Agreement [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of interest rate swaps \| Derivative	9		9		9
Aggregate notional amount	$ 89,100,000		$ 89,100,000		$ 89,500,000
Other Contract [Member] \| Forward TBA Contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregate notional amount	$ 76,000,000		$ 76,000,000		$ 91,000,000