CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net income		$ 298,724	$ 302,864	$ 305,072
Available-for-sale debt securities:
Net unrealized holding gains (losses) on debt securities	[1]	73,214	165,420	(718,582)
Defined benefit plans adjustments:
Net actuarial (loss) gain		(635)	177	(2,199)
Reclassification adjustment for amortization of net actuarial loss		35	11	2
Other comprehensive income (loss) for the year, net of tax		72,614	165,608	(720,779)
Total comprehensive income (loss)		$ 371,338	$ 468,472	$ (415,707)

[1] (1) Net unrealized holding gains (losses)   on available-for-sale debt securities have no tax   effect because securities are either tax-exempt,   held by an International Banking Entity ("IBE"), or have a full deferred tax asset   valuation allowance.