Accumulated Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Before-Tax
Net change	$ (278,005)		$ (60,299)	$ (997,274)	$ (145,143)
Tax Effect
Net change	78,621		17,420	287,623	43,250
Net-of-Tax
Amortization of unrealized losses on transferred securities		$ (113,000)
Other comprehensive loss	(199,384)		(42,879)	(709,651)	(101,893)
Debt Securities
Before-Tax
Net unrealized losses arising during the period	(229,246)		(58,138)	(902,548)	(143,131)
Net realized gains reclassified into net income	0		(354)	(1,306)	(1,178)
Amortization of unrealized losses on transferred securities	4,623		0	13,228	0
Net change	(224,623)		(58,492)	(890,626)	(144,309)
Tax Effect
Net unrealized losses arising during the period	67,801		17,210	266,884	42,384
Net realized gains reclassified into net income	0		104	386	348
Amortization of unrealized losses on transferred securities	(1,367)		0	(3,911)	0
Net change	66,434		17,314	263,359	42,732
Net-of-Tax
Net unrealized gains (losses) arising during the period	(161,445)		(40,928)	(635,664)	(100,747)
Net realized gains reclassified into net income	0		(250)	(920)	(830)
Amortization of unrealized losses on transferred securities	3,256		0	9,317	0
Net realized losses (gains) reclassified into net income	3,256		(250)	8,397	(830)
Other comprehensive loss	(158,189)		(41,178)	(627,267)	(101,577)
Cash Flow Hedges
Before-Tax
Net unrealized losses arising during the period	(48,325)		(170)	(88,771)	150
Net realized losses (gains) reclassified into net income	1,619		241	(1,601)	619
Net change	(46,706)		71	(90,372)	769
Tax Effect
Net unrealized losses arising during the period	13,902		49	25,539	(42)
Net realized losses (gains) reclassified into net income	(465)		(69)	461	(176)
Net change	13,437		(20)	26,000	(218)
Net-of-Tax
Net unrealized gains (losses) arising during the period	(34,423)		(121)	(63,232)	108
Net realized losses (gains) reclassified into net income	1,154		172	(1,140)	443
Other comprehensive loss	(33,269)		51	(64,372)	551
Foreign Currency Translation Adjustments
Before-Tax
Net unrealized losses arising during the period	(6,676)		(1,878)	(16,276)	(1,603)
Net change	(6,676)		(1,878)	(16,276)	(1,603)
Tax Effect
Net unrealized losses arising during the period	(1,250)		126	(1,736)	736
Net change	(1,250)		126	(1,736)	736
Net-of-Tax
Net unrealized gains (losses) arising during the period	(7,926)		(1,752)	(18,012)	(867)
Net realized losses (gains) reclassified into net income	0		0	0	0
Other comprehensive loss	$ (7,926)		$ (1,752)	$ (18,012)	$ (867)