Accumulated Other Comprehensive (Loss), Net of Tax - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net unrealized (losses)	$ (136,224)	$ (33,620)	$ (6,751)
Tax benefit	(248,300)	(216,664)	(153,694)
Net income	768,707	867,840	644,283
Hedge terminations	(1,588,899)	(1,290,991)	(250,451)
Premium amortization	3,927,286	3,628,260	2,284,737
Other expense	(139,309)	(168,748)	(180,088)
Gross losses realized on sale of available-for-sale securities	2,600	3,800
Investment Securities Available- for-Sale | Reclassification out of accumulated comprehensive income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net unrealized (losses)	(138,794)	(37,356)	(6,751)
Tax benefit	37,034	10,037	1,791
Net income	(101,760)	(27,319)	(4,960)
Derivative Financial Instruments | Reclassification out of accumulated comprehensive income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Tax benefit	75	720	1,066
Net income	(492)	(1,939)	(2,866)
Hedge terminations	(34)	(310)	(306)
Premium amortization	(533)	(2,349)	(3,626)
Defined Benefit Pension and Other Postretirement Benefit Plans | Reclassification out of accumulated comprehensive income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Tax benefit	517	1,072	600
Net income	(1,390)	(2,880)	(1,610)
Actuarial net loss amortization | Reclassification out of accumulated comprehensive income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other expense	(1,907)	(2,083)	(2,210)
Other | Reclassification out of accumulated comprehensive income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other expense	$ 0	$ (1,869)	$ 0