Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details) $ in Thousands	Mar. 31, 2024 USD ($) security	Dec. 31, 2023 USD ($) security
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security	114	82
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (8,388)	$ (4,773)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,222,990	$ 307,527
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	240	213
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (176,585)	$ (168,728)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,484,212	1,392,635
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(184,973)	(173,501)
Debt Securities, Available-for-sale, Unrealized Loss Position	2,707,201	1,700,162
HTM investment securities
Unrealized losses on held to maturity securities, less than 12 months	(2,938)	(2,184)
Fair value of unrealized losses on held to maturity securities, less than 12 months	344,741	220,865
Unrealized losses on held to maturity securities, 12 months or more	(578,965)	(533,046)
Fair value of unrealized losses on held to maturity securities, 12 months or more	2,671,899	2,566,468
Total unrealized losses on held to maturity securities	(581,903)	(535,230)
Total fair value of unrealized losses on held to maturity securities	$ 3,016,640	$ 2,787,333
US Treasury Securities
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	1	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (4,427)	$ (4,083)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	35,558	35,902
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(4,427)	(4,083)
Debt Securities, Available-for-sale, Unrealized Loss Position	35,558	35,902
HTM investment securities
Unrealized losses on held to maturity securities, less than 12 months	0	0
Fair value of unrealized losses on held to maturity securities, less than 12 months	0	0
Unrealized losses on held to maturity securities, 12 months or more	(30)	(36)
Fair value of unrealized losses on held to maturity securities, 12 months or more	969	963
Total unrealized losses on held to maturity securities	(30)	(36)
Total fair value of unrealized losses on held to maturity securities	$ 969	$ 963
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security	27	41
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (218)	$ (347)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 13,847	$ 23,762
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	108	92
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (2,777)	$ (1,867)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	64,217	53,022
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(2,995)	(2,214)
Debt Securities, Available-for-sale, Unrealized Loss Position	78,064	76,784
HTM investment securities
Unrealized losses on held to maturity securities, less than 12 months	(2,536)	(1,535)
Fair value of unrealized losses on held to maturity securities, less than 12 months	324,576	180,270
Unrealized losses on held to maturity securities, 12 months or more	(152,297)	(132,518)
Fair value of unrealized losses on held to maturity securities, 12 months or more	916,225	792,940
Total unrealized losses on held to maturity securities	(154,833)	(134,053)
Total fair value of unrealized losses on held to maturity securities	1,240,801	973,210
Mortgage-backed Securities, Issued by Private Enterprises [Member]
HTM investment securities
Unrealized losses on held to maturity securities, less than 12 months	0	0
Fair value of unrealized losses on held to maturity securities, less than 12 months	0	0
Unrealized losses on held to maturity securities, 12 months or more	(69,484)	(65,372)
Fair value of unrealized losses on held to maturity securities, 12 months or more	281,069	289,507
Total unrealized losses on held to maturity securities	(69,484)	(65,372)
Total fair value of unrealized losses on held to maturity securities	$ 281,069	$ 289,507
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security	2	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (116)	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 40,177	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	12	14
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (949)	$ (1,862)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	75,411	125,339
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(1,065)	(1,862)
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 115,588	$ 125,339
US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	5	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (28)	$ (28)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	677	761
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(28)	(28)
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 677	$ 761
Other Debt securities
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security	1	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (7)	$ (9)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 993	$ 991
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	2	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (28)	$ (42)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,972	1,958
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(35)	(50)
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 2,965	$ 2,950
US Government Sponsored-Enterprise Insured Loans | Residential Related Securities
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security	24	18
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (694)	$ (333)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 31,375	$ 22,870
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	71	71
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (156,185)	$ (153,219)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,045,343	1,080,337
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(156,880)	(153,552)
Debt Securities, Available-for-sale, Unrealized Loss Position	1,076,718	1,103,207
HTM investment securities
Unrealized losses on held to maturity securities, less than 12 months	(40)	(511)
Fair value of unrealized losses on held to maturity securities, less than 12 months	3,489	30,323
Unrealized losses on held to maturity securities, 12 months or more	(184,186)	(164,076)
Fair value of unrealized losses on held to maturity securities, 12 months or more	768,182	771,042
Total unrealized losses on held to maturity securities	(184,227)	(164,587)
Total fair value of unrealized losses on held to maturity securities	$ 771,671	$ 801,365
US Government Sponsored-Enterprise Insured Loans | Commercial mortgage-related securities
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	1	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (1,595)	$ (1,755)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	17,008	16,937
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(1,595)	(1,755)
Debt Securities, Available-for-sale, Unrealized Loss Position	17,008	16,937
HTM investment securities
Unrealized losses on held to maturity securities, less than 12 months	(263)	(121)
Fair value of unrealized losses on held to maturity securities, less than 12 months	8,003	8,144
Unrealized losses on held to maturity securities, 12 months or more	(162,187)	(160,660)
Fair value of unrealized losses on held to maturity securities, 12 months or more	620,926	624,770
Total unrealized losses on held to maturity securities	(162,450)	(160,781)
Total fair value of unrealized losses on held to maturity securities	$ 628,928	$ 632,914
Government National Mortgage Association (GNMA) [Member] | Residential Related Securities
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security	59	13
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (7,016)	$ (924)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,122,930	$ 156,847
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	10	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (3,643)	$ (1,898)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	105,462	26,643
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(10,658)	(2,822)
Debt Securities, Available-for-sale, Unrealized Loss Position	1,228,391	183,490
HTM investment securities
Unrealized losses on held to maturity securities, less than 12 months	(99)	(17)
Fair value of unrealized losses on held to maturity securities, less than 12 months	8,674	2,128
Unrealized losses on held to maturity securities, 12 months or more	(3,511)	(2,884)
Fair value of unrealized losses on held to maturity securities, 12 months or more	34,346	34,626
Total unrealized losses on held to maturity securities	(3,609)	(2,901)
Total fair value of unrealized losses on held to maturity securities	$ 43,020	$ 36,754
Government National Mortgage Association (GNMA) [Member] | Commercial mortgage-related securities
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security	1	9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (337)	$ (3,160)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 13,668	$ 103,055
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	30	22
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (6,954)	$ (3,975)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	138,564	51,738
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(7,291)	(7,135)
Debt Securities, Available-for-sale, Unrealized Loss Position	152,232	154,793
HTM investment securities
Unrealized losses on held to maturity securities, less than 12 months	0	0
Fair value of unrealized losses on held to maturity securities, less than 12 months	0	0
Unrealized losses on held to maturity securities, 12 months or more	(7,270)	(7,500)
Fair value of unrealized losses on held to maturity securities, 12 months or more	50,183	52,619
Total unrealized losses on held to maturity securities	(7,270)	(7,500)
Total fair value of unrealized losses on held to maturity securities	$ 50,183	$ 52,619
Held to maturity, number of securities, less than 12 months
HTM investment securities
Held-to-Maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	299	205
Held to maturity, number of securities, less than 12 months | US Treasury Securities
HTM investment securities
Held-to-Maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	0	0
Held to maturity, number of securities, less than 12 months | US States and Political Subdivisions Debt Securities [Member]
HTM investment securities
Held-to-Maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	287	182
Held to maturity, number of securities, less than 12 months | Mortgage-backed Securities, Issued by Private Enterprises [Member]
HTM investment securities
Held-to-Maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	0	0
Held to maturity, number of securities, less than 12 months | US Government Sponsored-Enterprise Insured Loans | Residential Related Securities
HTM investment securities
Held-to-Maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	5	20
Held to maturity, number of securities, less than 12 months | US Government Sponsored-Enterprise Insured Loans | Commercial mortgage-related securities
HTM investment securities
Held-to-Maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	1	1
Held to maturity, number of securities, less than 12 months | Government National Mortgage Association (GNMA) [Member] | Residential Related Securities
HTM investment securities
Held-to-Maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	6	2
Held to maturity, number of securities, less than 12 months | Government National Mortgage Association (GNMA) [Member] | Commercial mortgage-related securities
HTM investment securities
Held-to-Maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	0	0
Held to maturity, number of securities, 12 months or more
HTM investment securities
Held-to-Maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	921	785
Held to maturity, number of securities, 12 months or more | US Treasury Securities
HTM investment securities
Held-to-Maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	1	1
Held to maturity, number of securities, 12 months or more | US States and Political Subdivisions Debt Securities [Member]
HTM investment securities
Held-to-Maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	653	537
Held to maturity, number of securities, 12 months or more | Mortgage-backed Securities, Issued by Private Enterprises [Member]
HTM investment securities
Held-to-Maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	18	18
Held to maturity, number of securities, 12 months or more | US Government Sponsored-Enterprise Insured Loans | Residential Related Securities
HTM investment securities
Held-to-Maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	113	94
Held to maturity, number of securities, 12 months or more | US Government Sponsored-Enterprise Insured Loans | Commercial mortgage-related securities
HTM investment securities
Held-to-Maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	44	44
Held to maturity, number of securities, 12 months or more | Government National Mortgage Association (GNMA) [Member] | Residential Related Securities
HTM investment securities
Held-to-Maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	79	78
Held to maturity, number of securities, 12 months or more | Government National Mortgage Association (GNMA) [Member] | Commercial mortgage-related securities
HTM investment securities
Held-to-Maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	13	13