Accumulated Other Comprehensive Loss - Reclassification from Each Component of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Reclassification Out Of Accumulated Other Comprehensive Loss
Interest income	$ 393,548	$ 436,020
Tax effect	(33,173)	(57,165)
Total net of tax	96,280	146,551
Amortization of actuarial net loss	29,019	26,675
Amounts Reclassified from Accumulated Other Comprehensive Loss
Reclassification Out Of Accumulated Other Comprehensive Loss
Total net of tax	187	(387)
Amounts Reclassified from Accumulated Other Comprehensive Loss | Unrealized gains (losses) on derivatives (cash flow hedges) before tax
Reclassification Out Of Accumulated Other Comprehensive Loss
Interest income	298	(531)
Tax effect	(76)	152
Total net of tax	222	(379)
Amounts Reclassified from Accumulated Other Comprehensive Loss | Defined benefit pension plan
Reclassification Out Of Accumulated Other Comprehensive Loss
Tax effect	14	3
Total net of tax	(35)	(8)
Amortization of actuarial net loss	$ (49)	$ (11)