Statement of Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2025 USD ($) county Segment	Dec. 31, 2024 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of counties in which entity provides services | county	30
Business segments | Segment	1
Equity investments	20.00%
Loans past due days	90 days
Excess impaired credits	$ 250,000
Guaranteed Minimum Death Benefit [Member]
Summary Of Significant Accounting Policies [Line Items]
Other liabilities	$ 3,100,000	$ 3,400,000