Derivative Financial Instruments Notional Amounts and Fair Values of Derivative Financial Instruments (Details) $ in Thousands	Dec. 31, 2023 USD ($) position	Dec. 31, 2022 USD ($) position
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 157,612	$ 166,715
Derivative Liability, Fair Value, Gross Liability	(245,584)	(296,766)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	146,416	2,108,595
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3,240)	(256,382)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,145,336	477,373
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(298,236)	(89,665)
Debt Securities, Available-for-sale, Unrealized Loss Position	2,291,752	2,585,968
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(301,476)	(346,047)
Estimated Fair Value, Less Than 12 Months	0	504,922
Unrealized Losses, Less Than 12 Months	$ 0	$ (38,304)
Debt securities, held-to-maturity, number of positions | position	180	180,000,000
Estimated Fair Value, 12 Months or Longer	$ 1,072,207	$ 620,127
Unrealized Losses, 12 Months or Longer	(195,715)	(157,903)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	1,072,207	1,125,049
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(195,715)	(196,207)
U.S. Government securities
Derivatives, Fair Value [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	96,906
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(2,814)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	42,161	121,579
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(314)	(4,841)
Debt Securities, Available-for-sale, Unrealized Loss Position	42,161	218,485
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(314)	(7,655)
Residential mortgage-backed securities
Derivatives, Fair Value [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	409	154,861
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3)	(18,301)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	195,453	55,293
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(26,482)	(11,546)
Debt Securities, Available-for-sale, Unrealized Loss Position	195,862	210,154
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(26,485)	(29,847)
Estimated Fair Value, Less Than 12 Months	0	246,667
Unrealized Losses, Less Than 12 Months	0	(14,275)
Estimated Fair Value, 12 Months or Longer	355,270	153,178
Unrealized Losses, 12 Months or Longer	(51,805)	(43,205)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	355,270	399,845
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(51,805)	(57,480)
Commercial mortgage-backed securities
Derivatives, Fair Value [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	26,907	371,109
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,053)	(38,845)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	507,481	181,413
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(91,923)	(40,237)
Debt Securities, Available-for-sale, Unrealized Loss Position	534,388	552,522
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(92,976)	(79,082)
Estimated Fair Value, Less Than 12 Months	0	258,255
Unrealized Losses, Less Than 12 Months	0	(24,029)
Estimated Fair Value, 12 Months or Longer	716,937	466,949
Unrealized Losses, 12 Months or Longer	(143,910)	(114,698)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	716,937	725,204
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(143,910)	(138,727)
US Government Agencies Debt Securities
Derivatives, Fair Value [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	1,008
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(42)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,010	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(28)	0
Debt Securities, Available-for-sale, Unrealized Loss Position	1,010	1,008
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(28)	(42)
Interest Rate Locks with Customers
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	119,558	70,836
Derivative Liability, Notional Amount	1,015	4,939
Derivative Asset, Fair Value, Gross Asset	460	182
Interest Rate Locks with Customers | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	(2)	(51)
Forward Commitments
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	0	0
Derivative Liability, Notional Amount	42,000	10,000
Derivative Asset, Fair Value, Gross Asset	0	0
Forward Commitments | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	(854)	(147)
Interest Rate Derivatives with Customers
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	824,659	171,317
Derivative Liability, Notional Amount	3,784,236	3,802,480
Derivative Asset, Fair Value, Gross Asset	22,656	3,337
Interest Rate Derivatives with Customers | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	(222,530)	(280,401)
Interest Rate Swap With Counterparty [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	3,784,236	3,802,480
Derivative Liability, Notional Amount	824,659	171,317
Derivative Asset, Fair Value, Gross Asset	128,235	161,956
Interest Rate Swap With Counterparty [Member] | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	(23,023)	(3,703)
Interest Rate Swaps Used in Cash Flow Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	2,500,000	600,000
Derivative Liability, Notional Amount	750,000	1,000,000
Derivative Asset, Fair Value, Gross Asset	6,189	1,321
Interest Rate Swaps Used in Cash Flow Hedges [Member] | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0	(12,163)
Foreign Exchange Contracts with Customers
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	4,159	11,123
Derivative Liability, Notional Amount	13,353	3,672
Derivative Asset, Fair Value, Gross Asset	40	571
Foreign Exchange Contracts with Customers | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	(446)	(85)
Foreign Exchange Contracts with Correspondent Banks
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	15,969	4,887
Derivative Liability, Notional Amount	6,112	8,280
Derivative Asset, Fair Value, Gross Asset	532	101
Foreign Exchange Contracts with Correspondent Banks | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ (31)	$ (499)