Employee Benefits (Details) $ in Thousands	12 Months Ended
	May 31, 2026 USD ($) salary participant hour	May 31, 2025 USD ($) participant	May 31, 2024 USD ($)	Dec. 31, 2025	Dec. 31, 2023
Defined benefit multiemployer master pension plan
Multiemployer plans requisite service period	1 year
Percentage of joint and surviving spouse annuity	50.00%
Annuity factor	1.70%
Number of highest base salaries | salary	5
Contributions made by CFC	$ 8,000	$ 7,000	$ 6,000
Liability, defined benefit pension plan	8,000	8,000
Contributions by employer	1,000	1,000	1,000
Payment for settlement	1,000	1,000	1,000
Accumulated other comprehensive loss	2,369	2,236
Settlement loss (less than)	$ 1,000	1,000	1,000
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement and Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Noninterest Expense
Number of consecutive months considered for eligible period of service	12 months
Maximum matching contributions by CFC as a percentage of employee's salary	2.00%
Minimum employee contribution	2.00%
Contributions made by CFC	$ 1,000	$ 1,000	1,000
Executive benefit restoration plan
Defined benefit multiemployer master pension plan
Number of participants | participant	9	9
Pension expense	$ 1,000	$ 1,000	$ 1,000
Accumulated other comprehensive loss	5,000	$ 5,000
Accumulated other comprehensive income expected to be reclassified into earnings over the next 12 months (less than)	$ 1,000
Minimum
Defined benefit multiemployer master pension plan
Funded status, percentage (more than)				100.00%	90.00%
Requisite service period | hour	1,000
Maximum
Defined benefit multiemployer master pension plan
Contributions made by CFC as a percentage of total contributions by all participating employers	5.00%	5.00%	5.00%