Accumulated Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Before-Tax
Net change	$ (140,253)	$ (286,779)	$ (20,359)	$ (719,269)
Tax Effect
Net change	38,315	81,056	4,056	209,002
Net-of-Tax
Other comprehensive loss	(101,938)	(205,723)	(16,303)	(510,267)
Debt Securities
Before-Tax
Net unrealized losses arising during the period	(61,939)	(273,840)	921	(512,886)
Unrealized losses on debt securities transferred from AFS to HTM			0	(160,416)
Net realized gains reclassified into net income	0	(28)	10,000	(1,306)
Amortization of unrealized losses on transferred securities	3,998	5,324	7,919	8,605
Net change	(57,941)	(268,544)	18,840	(666,003)
Tax Effect
Net unrealized losses arising during the period	18,321	80,982	(264)	151,658
Unrealized losses on debt securities transferred from AFS to HTM			0	47,425
Net realized gains reclassified into net income	0	8	(2,956)	386
Amortization of unrealized losses on transferred securities	(1,182)	(1,574)	(2,341)	(2,544)
Net change	17,139	79,416	(5,561)	196,925
Net-of-Tax
Net unrealized losses arising during the period	(43,618)	(192,858)	657	(474,219)
Unrealized losses on debt securities transferred from AFS to HTM			0	(112,991)
Net realized gains reclassified into net income	0	(20)	7,044	(920)
Amortization of unrealized losses on transferred securities	2,816	3,750	5,578	6,061
Net realized losses (gains) reclassified into net income	2,816	3,730	12,622	5,141
Other comprehensive loss	(40,802)	(189,128)	13,279	(469,078)
Cash Flow Hedges
Before-Tax
Net unrealized losses arising during the period	(96,457)	(7,837)	(66,614)	(40,446)
Net realized losses (gains) reclassified into net income	20,252	(1,120)	30,896	(3,220)
Net change	(76,205)	(8,957)	(35,718)	(43,666)
Tax Effect
Net unrealized losses arising during the period	28,250	2,255	19,493	11,637
Net realized losses (gains) reclassified into net income	(5,932)	322	(9,049)	926
Net change	22,318	2,577	10,444	12,563
Net-of-Tax
Net unrealized losses arising during the period	(68,207)	(5,582)	(47,121)	(28,809)
Net realized losses (gains) reclassified into net income	14,320	(798)	21,847	(2,294)
Other comprehensive loss	(53,887)	(6,380)	(25,274)	(31,103)
Foreign Currency Translation Adjustments
Before-Tax
Net unrealized losses arising during the period	(6,107)	(9,278)	(3,481)	(9,600)
Net change	(6,107)	(9,278)	(3,481)	(9,600)
Tax Effect
Net unrealized losses arising during the period	(1,142)	(937)	(827)	(486)
Net change	(1,142)	(937)	(827)	(486)
Net-of-Tax
Net unrealized losses arising during the period	(7,249)	(10,215)	(4,308)	(10,086)
Net realized losses (gains) reclassified into net income	0	0	0	0
Other comprehensive loss	$ (7,249)	$ (10,215)	$ (4,308)	(10,086)
Accumulated Net Unrealized Investment Gain Loss Excluding Transfer to HTM
Net-of-Tax
Net unrealized losses arising during the period				$ (361,228)