Securities - Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	$ 605,736	$ 125,924
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(665)	(721)
Available-for-sale debt securities, 12 Months or More, Fair Value	4,651,745	5,532,528
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(570,395)	(728,216)
Available-for-sale debt securities fair value, Total	5,257,481	5,658,452
Available-for-sale debt securities, Gross Unrealized Loss, Total	(571,060)	(728,937)
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	641,573	623,978
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(34,721)	(52,313)
Available-for-sale debt securities fair value, Total	641,573	623,978
Available-for-sale debt securities, Gross Unrealized Loss, Total	(34,721)	(52,313)
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	272,448	364,446
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(36,829)	(47,640)
Available-for-sale debt securities fair value, Total	272,448	364,446
Available-for-sale debt securities, Gross Unrealized Loss, Total	(36,829)	(47,640)
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	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	403,937	463,572
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(38,184)	(63,276)
Available-for-sale debt securities fair value, Total	403,937	463,572
Available-for-sale debt securities, Gross Unrealized Loss, Total	(38,184)	(63,276)
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	605,736	9,402
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(665)	(558)
Available-for-sale debt securities, 12 Months or More, Fair Value	1,588,241	1,661,112
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(194,945)	(229,155)
Available-for-sale debt securities fair value, Total	2,193,977	1,670,514
Available-for-sale debt securities, Gross Unrealized Loss, Total	(195,610)	(229,713)
Municipal securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	0	2,825
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	0	(15)
Available-for-sale debt securities, 12 Months or More, Fair Value	255,356	254,773
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(31,840)	(36,327)
Available-for-sale debt securities fair value, Total	255,356	257,598
Available-for-sale debt securities, Gross Unrealized Loss, Total	(31,840)	(36,342)
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	2,742
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	0	(4)
Available-for-sale debt securities, 12 Months or More, Fair Value	309,524	364,774
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(32,236)	(42,058)
Available-for-sale debt securities fair value, Total	309,524	367,516
Available-for-sale debt securities, Gross Unrealized Loss, Total	(32,236)	(42,062)
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	479,327	553,671
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(68,783)	(89,664)
Available-for-sale debt securities fair value, Total	479,327	553,671
Available-for-sale debt securities, Gross Unrealized Loss, Total	(68,783)	(89,664)
Corporate 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	531,819	502,425
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(121,682)	(151,076)
Available-for-sale debt securities fair value, Total	531,819	502,425
Available-for-sale debt securities, Gross Unrealized Loss, Total	(121,682)	(151,076)
Foreign government bonds
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	0	110,955
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	0	(144)
Available-for-sale debt securities, 12 Months or More, Fair Value	89,291	88,616
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(10,709)	(11,384)
Available-for-sale debt securities fair value, Total	89,291	199,571
Available-for-sale debt securities, Gross Unrealized Loss, Total	(10,709)	(11,528)
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	35,735	42,300
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(460)	(934)
Available-for-sale debt securities fair value, Total	35,735	42,300
Available-for-sale debt securities, Gross Unrealized Loss, Total	(460)	(934)
Collateralized loan obligations (“CLOs”)
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	44,494	612,861
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(6)	(4,389)
Available-for-sale debt securities fair value, Total	44,494	612,861
Available-for-sale debt securities, Gross Unrealized Loss, Total	$ (6)	$ (4,389)