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

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- Definition

Percentage of risk.

+ References

No definition available.

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- Definition

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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- Definition

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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- Definition

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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- Definition

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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- Definition

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)	6 Months Ended
Investments - Additional Information (Detail)	Jun. 30, 2024 USD ($) Security	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Schedule Of Available For Sale Securities [Line Items]
Carrying value of securities pledged as collateral	$ 836,332,000		$ 748,970,000
Number of unrealized loss position, available-for-sale securities \| Security	548
Number of unrecognized loss position, held-to-maturity securities \| Security	1
Private Label Residential Mortgage-Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
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	16
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	167
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	$ 3,000,000
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	87.00%
General Obligation Bonds [Member] \| State and Political Subdivisions [Member]
Schedule Of Available For Sale Securities [Line Items]
Percentage of risk	63.00%