Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 3,012,018	$ 2,972,656
Other comprehensive income (loss) before reclassifications	(335,286)	(54,234)
Amounts reclassified from AOCI to income	(538)	(1,628)
Balance at end of period	5,232,114	2,979,447
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(2,375)	147,771
Balance at end of period	(338,199)	91,909
Unrealized Gains and Losses on Available- for-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(2,950)	145,335
Other comprehensive income (loss) before reclassifications	(311,153)	(57,287)
Amounts reclassified from AOCI to income	(261)	(1,553)
Balance at end of period	(314,364)	86,495
Unrealized Gains and Losses on Held-to- Maturity Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	0	0
Other comprehensive income (loss) before reclassifications	(16,963)	0
Amounts reclassified from AOCI to income	236	0
Balance at end of period	(16,727)	0
Gains and Losses on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	543	2,584
Other comprehensive income (loss) before reclassifications	(7,170)	3,053
Amounts reclassified from AOCI to income	(505)	(112)
Balance at end of period	(7,132)	5,525
Defined Benefit Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	32	(148)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from AOCI to income	(8)	37
Balance at end of period	$ 24	$ (111)