Derivative Financial Instruments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Derivative Financial Instruments
Notional Amount	$ 24,452,059,000	$ 20,979,193,000
Estimated Fair Value Gain	$ 172,939,000	$ 211,016,000
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]	Noninterest Income, Other	Noninterest Income, Other
Estimated Fair Value Loss	$ 804,486,000	$ 1,034,143,000
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]	Noninterest Income, Other	Noninterest Income, Other
Cash flow hedge liability	$ 0	$ 0
Fair value of the interest rate swap derivatives, other assets	169,000,000.0	209,800,000
Reduction in derivative asset fair value	635,300,000
Fair value of the interest rate swap derivatives, other liabilities	803,500,000	1,000,000.0
Reduction in derivative liability fair value		824,300,000
Estimated gain (loss) on fair value	(2,600,000)	163,000,000,000
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments
Fair value of forward commitments	(804,486,000)	(1,034,143,000)
Mortgage loan pipeline
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments
Obligation	65,051,000	40,850,000
Expected closures
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments
Obligation	54,993,000	37,210,000
Cash flow hedge
Derivative Financial Instruments
Collateral provided	0	0
Cash flow hedge | Borrower
Derivative Financial Instruments
Collateral provided	251,500,000
Cash flow hedge | Interest-bearing deposits | Counterparty
Derivative Financial Instruments
Cash collateral	45,200,000
Interest rate contracts
Derivative Financial Instruments
Notional Amount	22,600,000,000	20,900,000,000
Mortgage servicing rights hedging | Non-designated hedges
Derivative Financial Instruments
Notional Amount	142,000,000.0	35,000,000.0
Mortgage servicing rights hedging | Non-designated hedges | Other Assets and Other Liabilities
Derivative Financial Instruments
Notional Amount	142,000,000	$ 35,000,000
Estimated Fair Value Gain	$ 2,605,000
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]	Noninterest Income, Other	Noninterest Income, Other
Estimated Fair Value Loss		$ 163,000
Mortgage loan pipeline commitments hedging
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments
Obligation	$ 1,154,000	524,000
Mortgage loan pipeline commitments hedging | Non-designated hedges | Other Assets
Derivative Financial Instruments
Notional Amount	77,500,000	51,000,000
Estimated Fair Value Gain	$ 1,154,000	$ 800,000
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]	Noninterest Income, Other	Noninterest Income, Other
Estimated Fair Value Loss	$ 947,000
Forward commitments
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments
Obligation	77,500,000	$ 51,000,000
Fair value of forward commitments	(947,000)	276,000
Customer swaps | Cash flow hedge
Derivative Financial Instruments
Collateral provided	104,100,000
Interest rate swap
Derivative Financial Instruments
Gain or loss recorded	596,000	174,000
Interest rate swap | Fair Value Hedging | Counterparty
Derivative Financial Instruments
Notional Amount	9,200,000	12,300,000
Amortized cost basis of loans hedged	9,700,000	10,300,000
Interest rate swap | Fair Value Hedging | Other Liabilities | Counterparty
Derivative Financial Instruments
Notional Amount	9,188,000	12,289,000
Estimated Fair Value Gain	$ 220,000	$ 414,000
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Borrower
Derivative Financial Instruments
Notional Amount	$ 11,327,419,000	$ 10,480,171,000
Estimated Fair Value Gain	$ 60,145,000	$ 8,539,000
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]	Noninterest Income, Other	Noninterest Income, Other
Estimated Fair Value Loss	$ 803,539,000	$ 1,033,980,000
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]	Noninterest Income, Other	Noninterest Income, Other
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Counterparty
Derivative Financial Instruments
Notional Amount	$ 11,235,952,000	$ 10,400,733,000
Estimated Fair Value Gain	$ 108,820,000	$ 201,263,000
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]	Noninterest Income, Other	Noninterest Income, Other
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]	Noninterest Income, Other	Noninterest Income, Other
Interest rate swap | Non-designated hedges | Other Assets | Counterparty
Derivative Financial Instruments
Reduction in derivative asset fair value	$ 635,300,000
Interest rate swap | Economic hedges | Counterparty
Derivative Financial Instruments
Notional Amount	1,700,000,000	$ 0
Estimated Fair Value Loss	5,000
Interest rate swap | Economic hedges | Other Assets | Counterparty
Derivative Financial Instruments
Notional Amount	1,660,000,000
Estimated Fair Value Loss	5,000
Foreign exchange contract
Derivative Financial Instruments
Gain or loss recorded	$ 0	$ 0