Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 2,526,772	$ 2,718,396	$ 2,471,790	$ 3,406,352
Other comprehensive loss before reclassifications			(188,628)	(914,312)
Less: Amounts reclassified from accumulated other comprehensive loss			(282,238)	7,810
Net current-period other comprehensive income (loss)			93,610	(922,122)
Ending balance	2,446,553	2,416,163	2,446,553	2,416,163
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(700,982)	(661,163)	(923,192)	(56,696)
Ending balance	(829,582)	(978,818)	(829,582)	(978,818)
Unrealized Gains and (Losses) on Available for Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			(880,156)	(58,586)
Other comprehensive loss before reclassifications	(117,260)	(261,655)	(142,255)	(862,029)
Less: Amounts reclassified from accumulated other comprehensive loss	0	(186)	(258,540)	(1,760)
Net current-period other comprehensive income (loss)			116,285	(860,269)
Ending balance	(763,871)	(918,855)	(763,871)	(918,855)
Unrealized Gains and (Losses) on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			(50,159)	7,361
Other comprehensive loss before reclassifications	(20,829)	(53,363)	(46,373)	(52,283)
Less: Amounts reclassified from accumulated other comprehensive loss	(9,849)	2,699	(24,800)	9,199
Net current-period other comprehensive income (loss)			(21,573)	(61,482)
Ending balance	(71,732)	(54,121)	(71,732)	(54,121)
Defined Benefit Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			7,123	(5,471)
Other comprehensive loss before reclassifications			0	0
Less: Amounts reclassified from accumulated other comprehensive loss			1,102	371
Net current-period other comprehensive income (loss)			(1,102)	(371)
Ending balance	$ 6,021	$ (5,842)	$ 6,021	$ (5,842)