Securities - Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, fair value, less than 12 months	$ 5,303,995	$ 1,375,852
Available-for-sale debt securities, gross unrealized loss, less than 12 months	(61,206)	(7,107)
Available-for-sale debt securities, fair value, 12 months or more	3,599,012	4,071,829
Available-for-sale debt securities, gross unrealized loss, 12 months or more	(452,608)	(468,528)
Available-for-sale debt securities, fair value	8,903,007	5,447,681
Available-for-sale debt securities, gross unrealized loss	(513,814)	(475,635)
U.S. Treasury securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, fair value, less than 12 months	752,995	323,019
Available-for-sale debt securities, gross unrealized loss, less than 12 months	(11,871)	(1,627)
Available-for-sale debt securities, fair value, 12 months or more	580,436	575,638
Available-for-sale debt securities, gross unrealized loss, 12 months or more	(9,968)	(15,350)
Available-for-sale debt securities, fair value	1,333,431	898,657
Available-for-sale debt securities, gross unrealized loss	(21,839)	(16,977)
U.S. government agency and U.S. government-sponsored enterprise debt securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, fair value, less than 12 months	0	0
Available-for-sale debt securities, gross unrealized loss, less than 12 months	0	0
Available-for-sale debt securities, fair value, 12 months or more	254,400	257,654
Available-for-sale debt securities, gross unrealized loss, 12 months or more	(32,266)	(30,033)
Available-for-sale debt securities, fair value	254,400	257,654
Available-for-sale debt securities, gross unrealized loss	(32,266)	(30,033)
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, fair value, less than 12 months	3,473	0
Available-for-sale debt securities, gross unrealized loss, less than 12 months	(85)	0
Available-for-sale debt securities, fair value, 12 months or more	216,352	256,503
Available-for-sale debt securities, gross unrealized loss, 12 months or more	(25,298)	(27,312)
Available-for-sale debt securities, fair value	219,825	256,503
Available-for-sale debt securities, gross unrealized loss	(25,383)	(27,312)
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, fair value, less than 12 months	4,518,493	1,052,833
Available-for-sale debt securities, gross unrealized loss, less than 12 months	(49,168)	(5,480)
Available-for-sale debt securities, fair value, 12 months or more	1,324,514	1,582,952
Available-for-sale debt securities, gross unrealized loss, 12 months or more	(179,292)	(182,169)
Available-for-sale debt securities, fair value	5,843,007	2,635,785
Available-for-sale debt securities, gross unrealized loss	(228,460)	(187,649)
Municipal securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, fair value, less than 12 months	10,112	0
Available-for-sale debt securities, gross unrealized loss, less than 12 months	(71)	0
Available-for-sale debt securities, fair value, 12 months or more	225,102	237,214
Available-for-sale debt securities, gross unrealized loss, 12 months or more	(30,680)	(34,193)
Available-for-sale debt securities, fair value	235,214	237,214
Available-for-sale debt securities, gross unrealized loss	(30,751)	(34,193)
Non-agency commercial mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, fair value, less than 12 months	0	0
Available-for-sale debt securities, gross unrealized loss, less than 12 months	0	0
Available-for-sale debt securities, fair value, 12 months or more	174,606	190,948
Available-for-sale debt securities, gross unrealized loss, 12 months or more	(21,622)	(22,139)
Available-for-sale debt securities, fair value	174,606	190,948
Available-for-sale debt securities, gross unrealized loss	(21,622)	(22,139)
Non-agency residential mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, fair value, less than 12 months	0	0
Available-for-sale debt securities, gross unrealized loss, less than 12 months	0	0
Available-for-sale debt securities, fair value, 12 months or more	361,635	393,787
Available-for-sale debt securities, gross unrealized loss, 12 months or more	(59,324)	(58,421)
Available-for-sale debt securities, fair value	361,635	393,787
Available-for-sale debt securities, gross unrealized loss	(59,324)	(58,421)
Corporate debt securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, fair value, less than 12 months	0	0
Available-for-sale debt securities, gross unrealized loss, less than 12 months	0	0
Available-for-sale debt securities, fair value, 12 months or more	421,302	454,975
Available-for-sale debt securities, gross unrealized loss, 12 months or more	(84,823)	(89,183)
Available-for-sale debt securities, fair value	421,302	454,975
Available-for-sale debt securities, gross unrealized loss	(84,823)	(89,183)
Foreign government bonds
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, fair value, less than 12 months	18,922	0
Available-for-sale debt securities, gross unrealized loss, less than 12 months	(11)	0
Available-for-sale debt securities, fair value, 12 months or more	40,665	90,769
Available-for-sale debt securities, gross unrealized loss, 12 months or more	(9,335)	(9,231)
Available-for-sale debt securities, fair value	59,587	90,769
Available-for-sale debt securities, gross unrealized loss	$ (9,346)	(9,231)
Asset-backed securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, fair value, less than 12 months		0
Available-for-sale debt securities, gross unrealized loss, less than 12 months		0
Available-for-sale debt securities, fair value, 12 months or more		31,389
Available-for-sale debt securities, gross unrealized loss, 12 months or more		(497)
Available-for-sale debt securities, fair value		31,389
Available-for-sale debt securities, gross unrealized loss		$ (497)