Securities - Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	$ 134,063	$ 2,735,499
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(573)	(16,861)
Available-for-sale debt securities, 12 Months or More, Fair Value	4,245,316	4,413,878
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(502,670)	(657,376)
Available-for-sale debt securities fair value, Total	4,379,379	7,149,377
Available-for-sale debt securities, Gross Unrealized Loss, Total	(503,243)	(674,237)
U.S. Treasury securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	0	0
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	0	0
Available-for-sale debt securities, 12 Months or More, Fair Value	596,197	638,265
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(20,002)	(38,035)
Available-for-sale debt securities fair value, Total	596,197	638,265
Available-for-sale debt securities, Gross Unrealized Loss, Total	(20,002)	(38,035)
U.S. government agency and U.S. government-sponsored enterprise debt securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	0	0
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	0	0
Available-for-sale debt securities, 12 Months or More, Fair Value	256,386	262,587
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(31,982)	(45,633)
Available-for-sale debt securities fair value, Total	256,386	262,587
Available-for-sale debt securities, Gross Unrealized Loss, Total	(31,982)	(45,633)
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, Less than 12 Months, Fair Value	0	2,741
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	0	(30)
Available-for-sale debt securities, 12 Months or More, Fair Value	319,280	377,756
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(31,039)	(47,177)
Available-for-sale debt securities fair value, Total	319,280	380,497
Available-for-sale debt securities, Gross Unrealized Loss, Total	(31,039)	(47,207)
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, Less than 12 Months, Fair Value	122,698	2,719,228
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(503)	(16,404)
Available-for-sale debt securities, 12 Months or More, Fair Value	1,631,531	1,528,252
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(189,697)	(232,382)
Available-for-sale debt securities fair value, Total	1,754,229	4,247,480
Available-for-sale debt securities, Gross Unrealized Loss, Total	(190,200)	(248,786)
Municipal securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	1,949	2,763
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(43)	(95)
Available-for-sale debt securities, 12 Months or More, Fair Value	240,342	245,360
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(36,811)	(37,091)
Available-for-sale debt securities fair value, Total	242,291	248,123
Available-for-sale debt securities, Gross Unrealized Loss, Total	(36,854)	(37,186)
Non-agency commercial mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	0	10,767
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	0	(332)
Available-for-sale debt securities, 12 Months or More, Fair Value	196,038	235,668
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(23,706)	(35,435)
Available-for-sale debt securities fair value, Total	196,038	246,435
Available-for-sale debt securities, Gross Unrealized Loss, Total	(23,706)	(35,767)
Non-agency residential mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	0	0
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	0	0
Available-for-sale debt securities, 12 Months or More, Fair Value	403,678	433,608
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(63,148)	(80,919)
Available-for-sale debt securities fair value, Total	403,678	433,608
Available-for-sale debt securities, Gross Unrealized Loss, Total	(63,148)	(80,919)
Corporate debt securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	2,389	0
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(11)	0
Available-for-sale debt securities, 12 Months or More, Fair Value	479,481	526,166
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(96,019)	(127,334)
Available-for-sale debt securities fair value, Total	481,870	526,166
Available-for-sale debt securities, Gross Unrealized Loss, Total	(96,030)	(127,334)
Foreign government bonds
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	7,027	0
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(16)	0
Available-for-sale debt securities, 12 Months or More, Fair Value	90,440	87,008
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(9,560)	(12,992)
Available-for-sale debt securities fair value, Total	97,467	87,008
Available-for-sale debt securities, Gross Unrealized Loss, Total	(9,576)	(12,992)
Asset-backed securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	0	0
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	0	0
Available-for-sale debt securities, 12 Months or More, Fair Value	31,943	34,715
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(706)	(371)
Available-for-sale debt securities fair value, Total	31,943	34,715
Available-for-sale debt securities, Gross Unrealized Loss, Total	$ (706)	(371)
Collateralized loan obligations (“CLOs”)
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value		0
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months		0
Available-for-sale debt securities, 12 Months or More, Fair Value		44,493
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More		(7)
Available-for-sale debt securities fair value, Total		44,493
Available-for-sale debt securities, Gross Unrealized Loss, Total		$ (7)