Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 581,992	$ 428,287	$ 277,538
Change in debt securities available-for-sale:
Unrealized holding gains (losses) for the period	(31,355)	(1,004,054)	(187,955)
Reclassification for securities transferred to held-to-maturity	0	165,473	0
Reclassification adjustment for securities (gains) losses realized in income	6,265	88	(4,327)
Income tax effect	14,918	199,097	43,997
Unrealized gains (losses) on available-for-sale debt securities	(10,172)	(639,396)	(148,285)
Change in securities held-to-maturity:
Adjustment for securities transferred from available-for-sale	0	(165,473)	0
Amortization of unrealized losses on securities transferred     from available-for-sale	21,239	16,612	0
Income tax effect	(4,047)	36,197	0
Changes from securities held-to-maturity	17,192	(112,664)	0
Change in hedges:
Net unrealized derivative gains (losses) on hedges	69,276	(45,132)	1,898
Reclassification adjustment for (gains) losses realized in net income	(15,067)	2,587	(4,605)
Income tax effect	(13,479)	10,453	666
Changes from hedges	40,730	(32,092)	(2,041)
Change in defined benefit pension plans:
Amortization of net (gains) losses recognized in income	(182)	139	239
Income tax effect	45	(34)	(59)
Changes from defined benefit pension plans	(137)	105	180
Other comprehensive income (loss), net of tax	47,613	(784,047)	(150,146)
Comprehensive income (loss)	$ 629,605	$ (355,760)	$ 127,392