Securities - Continuous Unrealized Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	$ 598,769	$ 1,451,466
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(8,194)	(104,682)
Available-for-sale debt securities, 12 Months or More, Fair Value	5,502,622	4,332,275
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(763,660)	(740,048)
Available-for-sale debt securities fair value, Total	6,101,391	5,783,741
Available-for-sale debt securities, Gross Unrealized Loss, Total	(771,854)	(844,730)
U.S. Treasury securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	201,775	131,843
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(52)	(8,761)
Available-for-sale debt securities, 12 Months or More, Fair Value	616,680	474,360
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(59,618)	(61,342)
Available-for-sale debt securities fair value, Total	818,455	606,203
Available-for-sale debt securities, Gross Unrealized Loss, Total	(59,670)	(70,103)
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	207,936	97,403
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(1,021)	(6,902)
Available-for-sale debt securities, 12 Months or More, Fair Value	255,924	214,136
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(50,758)	(49,364)
Available-for-sale debt securities fair value, Total	463,860	311,539
Available-for-sale debt securities, Gross Unrealized Loss, Total	(51,779)	(56,266)
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	37,222	252,144
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(1,722)	(30,029)
Available-for-sale debt securities, 12 Months or More, Fair Value	459,893	248,125
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(65,308)	(47,094)
Available-for-sale debt securities fair value, Total	497,115	500,269
Available-for-sale debt securities, Gross Unrealized Loss, Total	(67,030)	(77,123)
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	23,200	307,536
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(721)	(20,346)
Available-for-sale debt securities, 12 Months or More, Fair Value	1,741,855	1,448,658
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(224,980)	(228,554)
Available-for-sale debt securities fair value, Total	1,765,055	1,756,194
Available-for-sale debt securities, Gross Unrealized Loss, Total	(225,701)	(248,900)
Municipal securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	2,053	95,655
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(24)	(10,194)
Available-for-sale debt securities, 12 Months or More, Fair Value	256,240	159,439
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(39,133)	(36,594)
Available-for-sale debt securities fair value, Total	258,293	255,094
Available-for-sale debt securities, Gross Unrealized Loss, Total	(39,157)	(46,788)
Non-agency commercial mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	6,833	106,184
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(151)	(3,309)
Available-for-sale debt securities, 12 Months or More, Fair Value	380,497	282,301
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(45,078)	(46,087)
Available-for-sale debt securities fair value, Total	387,330	388,485
Available-for-sale debt securities, Gross Unrealized Loss, Total	(45,229)	(49,396)
Non-agency residential mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	332	22,715
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(15)	(1,546)
Available-for-sale debt securities, 12 Months or More, Fair Value	638,077	626,509
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(105,553)	(111,432)
Available-for-sale debt securities fair value, Total	638,409	649,224
Available-for-sale debt securities, Gross Unrealized Loss, Total	(105,568)	(112,978)
Corporate debt securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	48,026	173,595
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(3,976)	(17,907)
Available-for-sale debt securities, 12 Months or More, Fair Value	468,227	352,679
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(143,273)	(129,321)
Available-for-sale debt securities fair value, Total	516,253	526,274
Available-for-sale debt securities, Gross Unrealized Loss, Total	(147,249)	(147,228)
Foreign government bonds
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	71,392	107,576
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(512)	(429)
Available-for-sale debt securities, 12 Months or More, Fair Value	37,683	36,143
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(12,317)	(13,857)
Available-for-sale debt securities fair value, Total	109,075	143,719
Available-for-sale debt securities, Gross Unrealized Loss, Total	(12,829)	(14,286)
Asset-backed securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	0	12,450
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	0	(524)
Available-for-sale debt securities, 12 Months or More, Fair Value	46,307	36,626
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(1,631)	(1,552)
Available-for-sale debt securities fair value, Total	46,307	49,076
Available-for-sale debt securities, Gross Unrealized Loss, Total	(1,631)	(2,076)
Collateralized loan obligations (“CLOs”)
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	0	144,365
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	0	(4,735)
Available-for-sale debt securities, 12 Months or More, Fair Value	601,239	453,299
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(16,011)	(14,851)
Available-for-sale debt securities fair value, Total	601,239	597,664
Available-for-sale debt securities, Gross Unrealized Loss, Total	$ (16,011)	$ (19,586)