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Derivatives and Hedging Activities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2022 USD ($) Derivative	Dec. 31, 2021 USD ($) Derivative	Dec. 31, 2020 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) on change in fair value	$ 5,838,000	$ 4,080,000	$ (8,750,000)
Collateral posted with market value on liability positions with credit risk-related contingent features	42,700,000
Forward TBA Contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) on change in fair value	$ 3,211,000	$ 2,796,000	(7,442,000)
Interest Rate Swaps and Caps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of interest rate swaps | Derivative	159	135
Aggregate notional amount	$ 936,800,000	$ 730,600,000
Income (loss) on derivative instrument not designated hedges	$ 4,400,000	$ 4,500,000	$ 8,100,000
Risk Participation in Agreements [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of interest rate swaps | Derivative	16	13
Aggregate notional amount	$ 187,800,000	$ 128,200,000
Risk Participation out Agreement [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of interest rate swaps | Derivative	1	1
Aggregate notional amount	$ 9,600,000	$ 9,800,000
Other Contract [Member] | Forward TBA Contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregate notional amount	$ 14,500,000	$ 48,500,000

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- Definition

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 increase (decrease) in the fair value of derivatives recognized in the income statement.

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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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