Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details) $ in Thousands	Mar. 31, 2022 USD ($) security	Dec. 31, 2021 USD ($) 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	207	120
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (93,177)	$ (34,586)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 2,044,781	$ 2,955,152
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	26	17
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (22,199)	$ (920)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	305,713	66,478
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(115,376)	(35,506)
Debt Securities, Available-for-sale, Unrealized Loss Position	2,350,494	3,021,630
Investment securities HTM
Unrealized losses on held to maturity securities, less than 12 months	(264,255)	(8,422)
Unrealized losses on held to maturity securities, 12 months or more	(10,930)	(387)
Total unrealized losses on held to maturity securities	$ (275,186)	$ (8,809)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer | security	12	1
Fair value of unrealized losses on held to maturity securities, less than 12 months	$ 2,586,375	$ 533,577
Fair value of unrealized losses on held to maturity securities, 12 months or more	77,887	10,775
Total fair value of unrealized losses on held to maturity securities	$ 2,664,262	$ 544,352
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security	510	72
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	5	7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (7,346)	$ (1,334)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 107,050	$ 122,957
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	2	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (850)	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	9,082	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(8,196)	(1,334)
Debt Securities, Available-for-sale, Unrealized Loss Position	116,132	$ 122,957
Investment securities HTM
Unrealized losses on held to maturity securities, less than 12 months	(34)
Unrealized losses on held to maturity securities, 12 months or more	0
Total unrealized losses on held to maturity securities	(34)
Fair value of unrealized losses on held to maturity securities, less than 12 months	964
Fair value of unrealized losses on held to maturity securities, 12 months or more	0
Total fair value of unrealized losses on held to maturity securities	$ 964
US Treasury Securities | Held to maturity, number of securities, less than 12 months
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	1
US Treasury Securities | Held to maturity, number of securities, 12 months or more
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	0
Agency 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	$ (800)	$ (103)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 14,200	$ 14,897
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(800)	(103)
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 14,200	14,897
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	64
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (195)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 35,501
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(195)
Debt Securities, Available-for-sale, Unrealized Loss Position	35,501
Investment securities HTM
Unrealized losses on held to maturity securities, less than 12 months	(79,571)	(1,951)
Unrealized losses on held to maturity securities, 12 months or more	(1,325)	0
Total unrealized losses on held to maturity securities	(80,896)	(1,951)
Fair value of unrealized losses on held to maturity securities, less than 12 months	576,351	112,038
Fair value of unrealized losses on held to maturity securities, 12 months or more	5,100	0
Total fair value of unrealized losses on held to maturity securities	$ 581,451	$ 112,038
US States and Political Subdivisions Debt Securities [Member] | Held to maturity, number of securities, less than 12 months
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	346	49
US States and Political Subdivisions Debt Securities [Member] | Held to maturity, number of securities, 12 months or more
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	5	0
Residential Related Securities | GNMA [Member]
Investment securities HTM
Unrealized losses on held to maturity securities, less than 12 months	$ (643)
Unrealized losses on held to maturity securities, 12 months or more	0
Total unrealized losses on held to maturity securities	(643)
Fair value of unrealized losses on held to maturity securities, less than 12 months	33,468
Fair value of unrealized losses on held to maturity securities, 12 months or more	0
Total fair value of unrealized losses on held to maturity securities	33,468
Residential Related Securities | FNMA/FHLMC
Investment securities HTM
Unrealized losses on held to maturity securities, less than 12 months	(72,418)
Unrealized losses on held to maturity securities, 12 months or more	0
Total unrealized losses on held to maturity securities	(72,418)
Fair value of unrealized losses on held to maturity securities, less than 12 months	896,284
Fair value of unrealized losses on held to maturity securities, 12 months or more	0
Total fair value of unrealized losses on held to maturity securities	$ 896,284
Residential Related Securities | Held to maturity, number of securities, less than 12 months | GNMA [Member]
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	46
Residential Related Securities | Held to maturity, number of securities, less than 12 months | FNMA/FHLMC
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	51
Residential Related Securities | Held to maturity, number of securities, 12 months or more | GNMA [Member]
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	0
Residential Related Securities | Held to maturity, number of securities, 12 months or more | FNMA/FHLMC
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	0
Commercial mortgage-related securities | GNMA [Member]
Investment securities HTM
Unrealized losses on held to maturity securities, less than 12 months		$ (200)
Unrealized losses on held to maturity securities, 12 months or more		0
Total unrealized losses on held to maturity securities		(200)
Fair value of unrealized losses on held to maturity securities, less than 12 months		33,468
Fair value of unrealized losses on held to maturity securities, 12 months or more		0
Total fair value of unrealized losses on held to maturity securities		33,468
Commercial mortgage-related securities | FNMA/FHLMC
Investment securities HTM
Unrealized losses on held to maturity securities, less than 12 months		(6,272)
Unrealized losses on held to maturity securities, 12 months or more		(387)
Total unrealized losses on held to maturity securities		(6,659)
Fair value of unrealized losses on held to maturity securities, less than 12 months		388,072
Fair value of unrealized losses on held to maturity securities, 12 months or more		10,775
Total fair value of unrealized losses on held to maturity securities		$ 398,847
Commercial mortgage-related securities | Held to maturity, number of securities, less than 12 months | GNMA [Member]
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security		5
Commercial mortgage-related securities | Held to maturity, number of securities, less than 12 months | FNMA/FHLMC
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security		18
Commercial mortgage-related securities | Held to maturity, number of securities, 12 months or more | GNMA [Member]
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security		0
Commercial mortgage-related securities | Held to maturity, number of securities, 12 months or more | FNMA/FHLMC
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security		1
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	7	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (1,955)	$ (256)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 110,489	$ 64,282
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	8	8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (2,135)	$ (867)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	58,489	62,576
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(4,090)	(1,123)
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 168,978	$ 126,858
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	8	9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (53)	$ (54)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,763	3,902
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(53)	(54)
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 2,763	$ 3,902
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	2	3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (27)	$ (6)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,973	$ 2,994
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(27)	(6)
Debt Securities, Available-for-sale, Unrealized Loss Position	1,973	$ 2,994
Mortgage-backed Securities, Issued by Private Enterprises [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		12
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		$ (2,335)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		$ 248,617
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		(2,335)
Debt Securities, Available-for-sale, Unrealized Loss Position		$ 248,617
Investment securities HTM
Unrealized losses on held to maturity securities, less than 12 months	(28,955)
Unrealized losses on held to maturity securities, 12 months or more	0
Total unrealized losses on held to maturity securities	(28,955)
Fair value of unrealized losses on held to maturity securities, less than 12 months	368,521
Fair value of unrealized losses on held to maturity securities, 12 months or more	0
Total fair value of unrealized losses on held to maturity securities	$ 368,521
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Held to maturity, number of securities, less than 12 months
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	18
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Held to maturity, number of securities, 12 months or more
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	0
FNMA/FHLMC | 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	88	74
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (80,850)	$ (21,249)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,617,123	$ 2,172,837
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	8	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (19,161)	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	235,380	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(100,011)	(21,249)
Debt Securities, Available-for-sale, Unrealized Loss Position	1,852,503	$ 2,172,837
FNMA/FHLMC | 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		19
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		$ (9,302)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		$ 328,568
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		(9,302)
Debt Securities, Available-for-sale, Unrealized Loss Position		$ 328,568
Investment securities HTM
Unrealized losses on held to maturity securities, less than 12 months	(79,178)
Unrealized losses on held to maturity securities, 12 months or more	(9,606)
Total unrealized losses on held to maturity securities	(88,784)
Fair value of unrealized losses on held to maturity securities, less than 12 months	342,543
Fair value of unrealized losses on held to maturity securities, 12 months or more	72,787
Total fair value of unrealized losses on held to maturity securities	$ 415,331
FNMA/FHLMC | Commercial mortgage-related securities | Held to maturity, number of securities, less than 12 months
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	15
FNMA/FHLMC | Commercial mortgage-related securities | Held to maturity, number of securities, 12 months or more
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	7
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	9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (726)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 44,614
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(726)
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 44,614
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	31
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (1,278)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 113,831
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(1,278)
Debt Securities, Available-for-sale, Unrealized Loss Position	113,831
Investment securities HTM
Unrealized losses on held to maturity securities, less than 12 months	(3,456)
Unrealized losses on held to maturity securities, 12 months or more	0
Total unrealized losses on held to maturity securities	(3,456)
Fair value of unrealized losses on held to maturity securities, less than 12 months	368,244
Fair value of unrealized losses on held to maturity securities, 12 months or more	0
Total fair value of unrealized losses on held to maturity securities	$ 368,244
Government National Mortgage Association (GNMA) [Member] | Commercial mortgage-related securities | Held to maturity, number of securities, less than 12 months
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	33
Government National Mortgage Association (GNMA) [Member] | Commercial mortgage-related securities | Held to maturity, number of securities, 12 months or more
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	0