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v3.25.3

Derivatives and Hedging Activities - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) Derivative | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) Derivative | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Collateral posted with market value on liability positions with credit risk-related contingent features | $ 20,400 |  | $ 20,400 |  | $ 42,600
Interest Rate Swaps and Caps [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Number of interest rate swaps | Derivative | 343 |  | 343 |  | 293
Aggregate notional amount | $ 2,300,000,000 |  | $ 2,300,000,000 |  | $ 1,900,000,000
Income (loss) on derivative instrument not designated hedges | $ 3,200,000 | $ 1,100,000 | $ 6,600,000 | $ 3,600,000 |
Risk Participation in Agreements [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Number of interest rate swaps | Derivative | 27 |  | 27 |  | 24
Aggregate notional amount | $ 276,500,000 |  | $ 276,500,000 |  | $ 233,800,000
Risk Participation out Agreement [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Number of interest rate swaps | Derivative | 8 |  | 8 |  | 8
Aggregate notional amount | $ 67,200,000 |  | $ 67,200,000 |  | $ 67,700,000
Other Contract [Member] | Forward TBA Contracts [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Aggregate notional amount | $ 137,500,000 |  | $ 137,500,000 |  | $ 29,000,000

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