Fair Value Disclosures - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2023 USD ($) Investment numberOfSwaps	Dec. 31, 2022 USD ($) numberOfSwaps	Dec. 31, 2021 USD ($)	Dec. 01, 2021 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration liability discount rate	0.083	0.083
Payment for contingent consideration liability	$ 635,000	$ 0	$ 58,000
Contingent consideration period rate		3 years
Servicing rights carrying amount before valuation allowance	9,100,000	$ 8,600,000
Servicing rights valuation allowance	98,000	5,000
Goodwill impairment	0	0	0
Impairments to identifiable intangible assets	0	0	0
Other real estate owned	$ 19,000,000	19,300,000
Number of properties transferred | Investment	1
Transfer of loans to other real estate owned	$ 79,000	18,325,000	$ 126,000
Not Designated as Hedging Instrument [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount	916,741,000	841,044,000
Credit Risk Contract [Member] | Not Designated as Hedging Instrument [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount	862,756,000	815,469,000
Contingent Consideration Liability [Member] | Fair Value Measured on Recurring Basis [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	1,224,000	1,765,000		$ 1,600,000
Contingent Consideration Liability [Member] | Fair Value Measured on Recurring Basis [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	1,224,000	1,765,000
Credit Risk Contract [Member] | Fair Value Measured on Recurring Basis [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	186,000	360,000
Credit Risk Contract [Member] | Fair Value Measured on Recurring Basis [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	$ 186,000	$ 360,000
Number of interest rate swaps held | numberOfSwaps	133	127
Paul I. Sheaffer Insurance Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Business Combination, Contingent Consideration, Liability, Current	$ (1,200,000)
Original potential cash payments from contingent consideration, minimum	0
Original potential cash payments from contingent consideration, maximum	1,300,000			$ 1,900,000
Held for Investment [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value of impaired loans held for investment	20,700,000	$ 13,400,000
Valuation allowance of impaired loans held for investment	1,800,000	$ 2,800,000
Lease Financings [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value of impaired loans held for investment	0
Real Estate-Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfer of loans to other real estate owned	$ 257,000