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Derivatives and Hedging Activities - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Derivative
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Derivative
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Collateral posted with market value on liability positions with credit risk-related contingent features $ 44,600,000   $ 44,600,000    
Interest Rate Swaps [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Number of interest rate swaps | Derivative 147   147   135
Aggregate notional amount $ 816,200,000   $ 816,200,000   $ 730,600,000
Income (loss) on derivative instrument not designated hedges $ 1,600,000 $ 400,000 $ 2,700,000 $ 3,300,000  
Risk Participation in Agreements [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Number of interest rate swaps | Derivative 14   14   13
Aggregate notional amount $ 152,300,000   $ 152,300,000   $ 128,200,000
Risk Participation out Agreement [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Number of interest rate swaps | Derivative 1   1   1
Aggregate notional amount $ 9,600,000   $ 9,600,000   $ 9,800,000
Other Contract [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Aggregate notional amount 32,000,000.0   32,000,000.0    
Other Contract [Member] | Forward TBA Contracts [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Aggregate notional amount $ 32,000,000   $ 32,000,000   $ 48,500,000