Securities - Continuous Unrealized Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	$ 359,894	$ 1,451,466
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(9,276)	(104,682)
Available-for-sale debt securities, 12 Months or More, Fair Value	5,398,622	4,332,275
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(824,247)	(740,048)
Available-for-sale debt securities fair value, Total	5,758,516	5,783,741
Available-for-sale debt securities, Gross Unrealized Loss, Total	(833,523)	(844,730)
U.S. Treasury securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	0	131,843
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	0	(8,761)
Available-for-sale debt securities, 12 Months or More, Fair Value	608,012	474,360
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(68,282)	(61,342)
Available-for-sale debt securities fair value, Total	608,012	606,203
Available-for-sale debt securities, Gross Unrealized Loss, Total	(68,282)	(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	206,807	97,403
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(1,696)	(6,902)
Available-for-sale debt securities, 12 Months or More, Fair Value	253,277	214,136
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(52,814)	(49,364)
Available-for-sale debt securities fair value, Total	460,084	311,539
Available-for-sale debt securities, Gross Unrealized Loss, Total	(54,510)	(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	20,690	252,144
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(1,580)	(30,029)
Available-for-sale debt securities, 12 Months or More, Fair Value	458,087	248,125
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(72,502)	(47,094)
Available-for-sale debt securities fair value, Total	478,777	500,269
Available-for-sale debt securities, Gross Unrealized Loss, Total	(74,082)	(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	26,838	307,536
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(1,074)	(20,346)
Available-for-sale debt securities, 12 Months or More, Fair Value	1,692,202	1,448,658
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(244,610)	(228,554)
Available-for-sale debt securities fair value, Total	1,719,040	1,756,194
Available-for-sale debt securities, Gross Unrealized Loss, Total	(245,684)	(248,900)
Municipal securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	7,651	95,655
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(111)	(10,194)
Available-for-sale debt securities, 12 Months or More, Fair Value	254,201	159,439
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(40,248)	(36,594)
Available-for-sale debt securities fair value, Total	261,852	255,094
Available-for-sale debt securities, Gross Unrealized Loss, Total	(40,359)	(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	0	106,184
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	0	(3,309)
Available-for-sale debt securities, 12 Months or More, Fair Value	381,043	282,301
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(48,733)	(46,087)
Available-for-sale debt securities fair value, Total	381,043	388,485
Available-for-sale debt securities, Gross Unrealized Loss, Total	(48,733)	(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	0	22,715
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	0	(1,546)
Available-for-sale debt securities, 12 Months or More, Fair Value	608,574	626,509
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(107,201)	(111,432)
Available-for-sale debt securities fair value, Total	608,574	649,224
Available-for-sale debt securities, Gross Unrealized Loss, Total	(107,201)	(112,978)
Corporate debt securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	29,702	173,595
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(4,299)	(17,907)
Available-for-sale debt securities, 12 Months or More, Fair Value	456,048	352,679
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(163,453)	(129,321)
Available-for-sale debt securities fair value, Total	485,750	526,274
Available-for-sale debt securities, Gross Unrealized Loss, Total	(167,752)	(147,228)
Foreign government bonds
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	68,206	107,576
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(516)	(429)
Available-for-sale debt securities, 12 Months or More, Fair Value	38,738	36,143
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(11,262)	(13,857)
Available-for-sale debt securities fair value, Total	106,944	143,719
Available-for-sale debt securities, Gross Unrealized Loss, Total	(11,778)	(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	44,875	36,626
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(1,457)	(1,552)
Available-for-sale debt securities fair value, Total	44,875	49,076
Available-for-sale debt securities, Gross Unrealized Loss, Total	(1,457)	(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	603,565	453,299
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(13,685)	(14,851)
Available-for-sale debt securities fair value, Total	603,565	597,664
Available-for-sale debt securities, Gross Unrealized Loss, Total	$ (13,685)	$ (19,586)