Earnings Per Share (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares
Class B common stock
Reconciliation of the numerators and denominators used in the basic and diluted per-share computations
Ratio for converting shares of Class B common stock into shares of Class A common stock	2,400	2,400
Income available to stockholders (Basic EPS:)
Allocated net income (numerator) | $	$ 4,580	$ 4,915	$ 3,652
Weighted shares (denominator) (in shares) | shares	2,542	2,542	2,542
Per-share amount (in dollars per share) | $ / shares	$ 1,802	$ 1,934	$ 1,437
Income available to stockholders on equivalent shares (Diluted EPS:)
Allocated net income (numerator) | $	$ 4,579	$ 4,914	$ 3,652
Weighted shares (denominator) (in shares) | shares	2,542	2,542	2,542
Per-share amount (in dollars per share) | $ / shares	$ 1,801	$ 1,933	$ 1,437
Class A common stock
Income available to stockholders (Basic EPS:)
Allocated net income (numerator) | $	$ 554,755	$ 595,399	$ 442,409
Weighted shares (denominator) (in shares) | shares	46,189,024	46,189,044	46,188,981
Per-share amount (in dollars per share) | $ / shares	$ 12.01	$ 12.89	$ 9.58
Dilutive effect of stock-based awards
Allocated net income (numerator) | $	$ 0	$ 0	$ 0
Weighted shares (denominator) (in shares) | shares	15,600	16,422	9,630
Assumed conversion of Class B shares
Allocated net income (numerator) | $	$ 4,580	$ 4,915	$ 3,652
Weighted shares (denominator) (in shares) | shares	6,100,800	6,100,800	6,100,800
Income available to stockholders on equivalent shares (Diluted EPS:)
Allocated net income (numerator) | $	$ 559,335	$ 600,314	$ 446,061
Weighted shares (denominator) (in shares) | shares	52,305,424	52,306,266	52,299,411
Per-share amount (in dollars per share) | $ / shares	$ 10.69	$ 11.48	$ 8.53