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Loans and Allowance for Loan Losses - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($) Loan	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) Loan	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
Gross loans	$ 2,172,802		$ 2,172,802		$ 1,808,484
Proceeds from sale of loans held for sale			460,655	$ 965,119
Gain on sale of Paycheck Protection Program loans	$ 0	$ 0	0	$ (24,315)
Nonperforming trouble debt restructuring			$ 1,900		688
Number of loans in the process of foreclosure | Loan	0		0
Substandard [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans	$ 22,659		$ 22,659		37,315
Commercial and Residential Mortgages [Member] | Asset Pledged as Collateral without Right [Member] | Federal Home Loan Bank Advances [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged	300,800		300,800		478,300
Pay Check Protection Loans [Member] | Paycheck Protection Plan Liquidity Facility Advances [Member] | Asset Pledged as Collateral without Right [Member] | Federal Home Loan Bank Advances [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged	599,000		599,000		17,900
Paycheck Protection Program [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans	$ 13,148		$ 13,148		$ 30,742

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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