Fair Value Disclosures - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2024 USD ($) Investment numberOfSwaps	Dec. 31, 2023 USD ($) numberOfSwaps	Dec. 31, 2022 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	$ 635,000	$ 0
Servicing rights carrying amount before valuation allowance	7,000,000.0	9,100,000
Servicing rights valuation allowance	7,000	98,000
Goodwill impairment	0	0	0
Impairments to identifiable intangible assets	0	0	0
Other real estate owned	20,100,000	19,000,000.0
Transfer of loans to other real estate owned	407,000	79,000	$ 18,325,000
Other Real Estate, Period Increase (Decrease)	824,000
Other Repossessed Assets	76,000	0
Proceeds from Sale of Foreclosed Assets	68,000
Not Designated as Hedging Instrument [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount	923,658,000	916,741,000
Credit Risk Contract [Member] | Not Designated as Hedging Instrument [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount	860,423,000	862,756,000
Contingent Consideration Liability [Member] | Fair Value Measured on Recurring Basis [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	635,000	1,224,000		$ 1,200,000
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	635,000	1,224,000
Credit Risk Contract [Member] | Fair Value Measured on Recurring Basis [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	67,000	186,000
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	$ 67,000	$ 186,000
Number of interest rate swaps held | numberOfSwaps	135	133
Paul I. Sheaffer Insurance Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Business Combination, Contingent Consideration, Liability, Current	$ (635,000)
Original potential cash payments from contingent consideration, maximum	635,000
Paul I. Sheaffer Insurance Agency [Member] | Minimum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Original potential cash payments from contingent consideration, minimum	0
Paul I. Sheaffer Insurance Agency [Member] | Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Original potential cash payments from contingent consideration, maximum	1,300,000
Held for Investment [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value of impaired loans held for investment	12,100,000	$ 20,700,000
Valuation allowance of impaired loans held for investment	1,900,000	$ 1,800,000
Lease Financings [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value of impaired loans held for investment	$ 0
Real Estate-Residential Secured for Business Purpose [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of properties transferred | Investment	1
Transfer of loans to other real estate owned	$ 156,000
Real Estate-Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of properties transferred | Investment	1
Transfer of loans to other real estate owned	$ 252,000