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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