Investments - Additional Information (Detail)	6 Months Ended	12 Months Ended
Jun. 30, 2026 USD ($) Security	Dec. 31, 2025 USD ($)
Schedule Of Available For Sale Securities [Line Items]
Number of unrealized loss position, available-for-sale securities \| Security	178
Number of unrecognized loss position, held-to-maturity securities \| Security	2
Unrealized gain (loss) for other investments \| $	$ 423,000	$ 159,000
Impairment losses of fund investment \| $	$ 2,183,000
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	1
Allowance for credit losses \| $	$ 0
Corporate [Member]
Schedule Of Available For Sale Securities [Line Items]
Number of positions \| Security	47
Allowance for credit losses \| $	$ 0
State and Political Subdivisions [Member]
Schedule Of Available For Sale Securities [Line Items]
Number of positions \| Security	64
Allowance for credit losses \| $	$ 0
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	58.00%
General Obligation Bonds [Member] \| State and Political Subdivisions [Member]
Schedule Of Available For Sale Securities [Line Items]
Percentage of risk	51.00%

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

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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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