Derivatives and Hedging Activities - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2024 USD ($) Derivative	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Collateral posted with market value on liability positions with credit risk-related contingent features	$ 50,900,000		$ 26,000,000
Interest Rate Swaps and Caps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of interest rate swaps | Derivative	247		236
Aggregate notional amount	$ 1,600,000,000		$ 1,600,000,000
Income (loss) on derivative instrument not designated hedges	$ 800,000	$ 1,800,000
Risk Participation in Agreements [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of interest rate swaps | Derivative	21		19
Aggregate notional amount	$ 223,500,000		$ 197,200,000
Risk Participation out Agreement [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of interest rate swaps | Derivative	5		5
Aggregate notional amount	$ 40,700,000		$ 40,900,000
Other Contract [Member] | Forward TBA Contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregate notional amount	$ 26,500,000		$ 27,000,000