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	Dec. 31, 2022 USD ($) Security	Dec. 31, 2021 USD ($) Security
Available for Sale
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	719	89
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 2,108,595	$ 917,933
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (256,382)	$ (13,925)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	63	119
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 477,373	$ 91,336
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(89,665)	(2,331)
Debt Securities, Available-for-sale, Unrealized Loss Position	2,585,968	1,009,269
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (346,047)	$ (16,256)
Held to Maturity
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	127	50
Estimated Fair Value, Less Than 12 Months	$ 504,922	$ 762,923
Unrealized Losses, Less Than 12 Months	$ (38,304)	$ (25,539)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	53	0
Estimated Fair Value, 12 Months or Longer	$ 620,127	$ 0
Unrealized Losses, 12 Months or Longer	(157,903)	0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	1,125,049	762,923
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(196,207)	(25,539)
Amortized cost basis	2,992,513	3,129,530
Gross Unrealized Gains	301	74,116
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(346,047)	(16,256)
Estimated Fair Value	2,646,767	3,187,390
HTM, at amortized cost	1,321,256	$ 980,384
Gross Unrealized Gains	0
Gross Unrealized Losses	(196,207)
Estimated Fair Value	$ 1,125,049
U.S. Government securities
Available for Sale
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	1	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 96,906	$ 127,618
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (2,814)	$ (213)
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	$ 121,579	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(4,841)	0
Debt Securities, Available-for-sale, Unrealized Loss Position	218,485	127,618
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(7,655)	(213)
Held to Maturity
Amortized cost basis	226,140	127,831
Gross Unrealized Gains	0	0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(7,655)	(213)
Estimated Fair Value	$ 218,485	$ 127,618
US Government Agencies Debt Securities [Member]
Available for Sale
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,008
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (42)
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	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Debt Securities, Available-for-sale, Unrealized Loss Position	1,008
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(42)
Held to Maturity
Amortized cost basis	1,050
Gross Unrealized Gains	0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(42)
Estimated Fair Value	$ 1,008
State and municipal securities
Available for Sale
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	360	29
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 995,122	$ 82,731
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (157,397)	$ (678)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	29	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 61,089	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(21,419)	0
Debt Securities, Available-for-sale, Unrealized Loss Position	1,056,211	82,731
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (178,816)	$ (678)
Corporate debt securities
Available for Sale
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	66	6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 376,398	$ 43,068
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (31,333)	$ (358)
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	$ 37,157	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(6,150)	0
Debt Securities, Available-for-sale, Unrealized Loss Position	413,555	43,068
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(37,483)	(358)
Held to Maturity
Amortized cost basis	459,792	373,482
Gross Unrealized Gains	0	13,009
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(37,483)	(358)
Estimated Fair Value	$ 422,309	$ 386,133
Collateralized mortgage obligations
Available for Sale
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	96	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 113,191	$ 28,517
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (7,650)	$ (754)
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	$ 20,842	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(5,472)	0
Debt Securities, Available-for-sale, Unrealized Loss Position	134,033	28,517
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(13,122)	(754)
Held to Maturity
Amortized cost basis	147,155	206,532
Gross Unrealized Gains	0	3,581
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(13,122)	(754)
Estimated Fair Value	$ 134,033	$ 209,359
Residential mortgage-backed securities
Available for Sale
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	81	7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 154,861	$ 123,687
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (18,301)	$ (2,388)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	5	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 55,293	$ 16,669
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(11,546)	(648)
Debt Securities, Available-for-sale, Unrealized Loss Position	210,154	140,356
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (29,847)	$ (3,036)
Held to Maturity
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	106	14
Estimated Fair Value, Less Than 12 Months	$ 246,667	$ 205,969
Unrealized Losses, Less Than 12 Months	$ (14,275)	$ (7,067)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	14	0
Estimated Fair Value, 12 Months or Longer	$ 153,178	$ 0
Unrealized Losses, 12 Months or Longer	(43,205)	0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	399,845	205,969
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(57,480)	(7,067)
Amortized cost basis	242,527	231,607
Gross Unrealized Gains	18	1,224
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(29,847)	(3,036)
Estimated Fair Value	212,698	229,795
HTM, at amortized cost	457,325	404,958
Gross Unrealized Gains	0	11,022
Gross Unrealized Losses	(57,480)	(7,067)
Estimated Fair Value	$ 399,845	$ 408,913
Commercial mortgage-backed securities
Available for Sale
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	114	41
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 371,109	$ 512,312
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (38,845)	$ (9,534)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	20	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 181,413	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(40,237)	0
Debt Securities, Available-for-sale, Unrealized Loss Position	552,522	512,312
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (79,082)	$ (9,534)
Held to Maturity
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	21	36
Estimated Fair Value, Less Than 12 Months	$ 258,255	$ 556,954
Unrealized Losses, Less Than 12 Months	$ (24,029)	$ (18,472)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	39	0
Estimated Fair Value, 12 Months or Longer	$ 466,949	$ 0
Unrealized Losses, 12 Months or Longer	(114,698)	0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	725,204	556,954
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(138,727)	(18,472)
Amortized cost basis	631,604	974,541
Gross Unrealized Gains	0	6,141
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(79,082)	(9,534)
Estimated Fair Value	552,522	971,148
HTM, at amortized cost	863,931	575,426
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(138,727)	(18,472)
Estimated Fair Value	$ 725,204	$ 556,954
Auction rate securities
Available for Sale
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		(1,683)
Debt Securities, Available-for-sale, Unrealized Loss Position		74,667
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		(1,683)
Held to Maturity
Amortized cost basis		76,350
Gross Unrealized Gains		0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax		(1,683)
Estimated Fair Value		$ 74,667