Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 2,974,855	$ 2,471,790
Other comprehensive loss before reclassifications	(56,158)	48,779
Less: Amounts reclassified from accumulated other comprehensive loss	(9,636)	(264,549)
Net current-period other comprehensive income (loss)	(46,522)	313,328
Ending balance	2,952,831	2,579,123
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(608,352)	(923,192)
Ending balance	(654,874)	(609,864)
Unrealized Gains and (Losses) on Available for Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(584,243)	(880,156)
Other comprehensive loss before reclassifications	(27,559)	33,491
Less: Amounts reclassified from accumulated other comprehensive loss	0	(258,540)
Net current-period other comprehensive income (loss)	(27,559)	292,031
Ending balance	(611,802)	(588,125)
Unrealized Gains and (Losses) on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(31,571)	(50,159)
Other comprehensive loss before reclassifications	(28,599)	15,288
Less: Amounts reclassified from accumulated other comprehensive loss	(10,152)	(6,390)
Net current-period other comprehensive income (loss)	(18,447)	21,678
Ending balance	(50,018)	(28,481)
Defined Benefit Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	7,462	7,123
Other comprehensive loss before reclassifications	0	0
Less: Amounts reclassified from accumulated other comprehensive loss	516	381
Net current-period other comprehensive income (loss)	(516)	(381)
Ending balance	$ 6,946	$ 6,742