The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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Nominal or face amount used to calculate payment on derivative.

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Number of interest rate derivative instruments held by the entity at the reporting date.

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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