Debt securities held-to-maturity unrealized loss position number of positions.

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Debt securities held-to-maturity unrecognized loss position number of positions.

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Equity securities unrealized gain loss on investments.

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Percentage of risk.

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Qualified affordable housing project investments commitment unfunded tax credit.

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Description of nature of impairment loss for investment that generates income tax credit and other income tax benefit under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, investment under tax credit program not meeting condition for accounting under proportional amortization method.

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Amount, before amortization expense, of income tax credit and other tax benefit generated by investment under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, investment under tax credit program not meeting condition for accounting under proportional amortization method.

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Amount of amortization expense for investment that generates income tax credit and other income tax benefit under tax credit program accounted for using proportional amortization method.

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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The amount deducted from an entities' taxes, reflecting a percentage of an amount invested in certain assets spread over the useful life of those assets; includes deferred investment tax credits.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The carrying amount (fair value) as of the balance sheet date of securities held that had been pledged by counterparties under financing and lending arrangements, pursuant to which the entity has the right by agreement or custom to sell or re-pledge such securities.

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Investments - Additional Information (Detail)	12 Months Ended
Investments - Additional Information (Detail)	Dec. 31, 2024 USD ($) Security	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Schedule Of Available For Sale Securities [Line Items]
Carrying value of securities pledged as collateral	$ 836,868,000	$ 748,970,000
Number of unrealized loss position, available-for-sale securities \| Security	485
Number of unrecognized loss position, held-to-maturity securities \| Security	2
Unrealized gain (loss) for investments	$ 3,000	104,000	$ (74,000)
Unfunded Commitment in qualified affordable housing projects	$ 12,067,000	19,315,000	15,218,000
Commitments expected to be fulfill	The Company expects to fulfill these commitments during the years 2025 through 2039.
Amortization expense for qualified affordable housing project investments			1,953,000
Tax credits from investment in affordable housing	$ 1,793,000	1,327,000	$ 906,000
Private Label Residential Mortgage-Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Number of unrealized loss position, held-to-maturity securities \| Security	32
Allowance for credit losses	$ 0
Corporate [Member]
Schedule Of Available For Sale Securities [Line Items]
Number of unrealized loss position, available-for-sale securities \| Security	19
Allowance for credit losses	$ 0
State and Political Subdivisions [Member]
Schedule Of Available For Sale Securities [Line Items]
Number of unrealized loss position, available-for-sale securities \| Security	168
Allowance for credit losses	$ 0
Not Included in Proportional Amortization [Member]
Schedule Of Available For Sale Securities [Line Items]
Contingent contributions for investment tax credit	$ 0	$ 4,000
Simplified Supervisory Formula Approach [Member] \| Private Label Residential Mortgage-Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Percentage of risk	20.00%
Nationally Recognized Statistical Ratings Organization [Member] \| State and Political Subdivisions [Member]
Schedule Of Available For Sale Securities [Line Items]
Percentage of risk	86.00%
General Obligation Bonds [Member] \| State and Political Subdivisions [Member]
Schedule Of Available For Sale Securities [Line Items]
Percentage of risk	62.00%