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Investment Securities Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in a Continuous Unrealized Loss Position (Details) $ in Thousands	Jun. 30, 2022 USD ($) Security	Dec. 31, 2021 USD ($) Security
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	589	89
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 2,534,403	$ 917,933
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (236,165)	$ (13,925)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	11	119
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 108,851	$ 91,336
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(19,977)	(2,331)
Debt Securities, Available-for-sale, Unrealized Loss Position	2,643,254	1,009,269
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (256,142)	$ (16,256)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	97	50
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 636,569	$ 762,923
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (36,821)	$ (25,539)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	32	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	$ 454,653	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(87,126)	0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	1,091,222	762,923
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ (123,947)	$ (25,539)
US Government Debt Securities
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	4	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 371,266	$ 127,618
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (5,239)	$ (213)
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	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	371,266	127,618
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (5,239)	$ (213)
State and Municipal Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	355	29
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 989,029	$ 82,731
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (149,910)	$ (678)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	6	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 24,248	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(6,705)	0
Debt Securities, Available-for-sale, Unrealized Loss Position	1,013,277	82,731
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (156,615)	$ (678)
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	55	6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 363,657	$ 43,068
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (20,112)	$ (358)
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	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	363,657	43,068
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (20,112)	$ (358)
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	72	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 140,957	$ 28,517
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (6,465)	$ (754)
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	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	140,957	28,517
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (6,465)	$ (754)
Residential Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	28	7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 130,063	$ 123,687
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (9,194)	$ (2,388)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	4	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 60,469	$ 16,669
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(9,181)	(648)
Debt Securities, Available-for-sale, Unrealized Loss Position	190,532	140,356
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (18,375)	$ (3,036)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	58	14
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 181,966	$ 205,969
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (4,790)	$ (7,067)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	12	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	$ 152,702	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(30,654)	0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	334,668	205,969
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ (35,444)	$ (7,067)
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	75	41
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 539,431	$ 512,312
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (45,245)	$ (9,534)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	1	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 24,134	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(4,091)	0
Debt Securities, Available-for-sale, Unrealized Loss Position	563,565	512,312
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (49,336)	$ (9,534)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	39	36
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 454,603	$ 556,954
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (32,031)	$ (18,472)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	20	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	$ 301,951	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(56,472)	0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	756,554	556,954
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ (88,503)	$ (18,472)
Auction Rate Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security		118
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		$ 74,667
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(1,683)
Debt Securities, Available-for-sale, Unrealized Loss Position		74,667
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		$ (1,683)

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