Fair Value Disclosures - Additional Information (Detail)		12 Months Ended
	Dec. 01, 2021 USD ($)	Dec. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Servicing rights carrying amount before valuation allowance		$ 7,900,000	$ 6,500,000
Servicing rights valuation allowance		13,000	87,000
Goodwill impairment		0	0	$ 0
Impairments to identifiable intangible assets		0	0	$ 0
Other real estate owned		279,000	7,400,000
Paul I. Sheaffer Insurance Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Original potential cash payments from contingent consideration, minimum	$ 0
Original potential cash payments from contingent consideration, maximum	$ 1,900,000
Potential cash payments from contingent consideration, period of measurement (in years)	3 years
Potential cash payments from contingent consideration, end date	Nov. 30, 2024
Held for Investment [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value of impaired loans held for investment		33,100,000	31,500,000
Valuation allowance of impaired loans held for investment		11,000	$ 585,000
Lease Financings [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value of impaired loans held for investment		$ 0
Derivative Financial Instruments, Liabilities [Member] | Interest Rate Swap [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of loans with unrealized gain | loan		1
Unrealized gain on loans		$ 1,000
Commercial Loan [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of loans | loan		1