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Derivative Financial Instruments (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Derivative Financial Instruments          
Notional Amount $ 21,759,161,000   $ 21,759,161,000   $ 20,979,193,000
Estimated Fair Value Gain     $ 174,480,000   $ 211,016,000
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]     Noninterest Income, Other   Noninterest Income, Other
Estimated Fair Value Loss     $ 975,717,000   $ 1,034,143,000
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]     Noninterest Income, Other   Noninterest Income, Other
Net gain (loss) (84,000) $ 68,000 $ 12,000 $ 110,000  
Fair value of the interest rate swap derivatives, other assets 172,800,000,000   172,800,000,000   $ 209,800,000
Reduction in derivative asset fair value     801,900,000   824,300,000
Fair value of the interest rate swap derivatives, other liabilities 974,500,000,000   974,500,000,000   1,000,000,000.0
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 (975,717,000)   (975,717,000)   (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 99,826,000   99,826,000   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 89,037,000   89,037,000   37,210,000
Cash flow hedge          
Derivative Financial Instruments          
Collateral provided 0   0   0
Cash flow hedge | Borrower          
Derivative Financial Instruments          
Collateral provided 266,300,000   266,300,000    
Cash flow hedge | Counterparty          
Derivative Financial Instruments          
Collateral provided 108,300,000   108,300,000    
Cash flow hedge | Interest-bearing deposits | Counterparty          
Derivative Financial Instruments          
Cash collateral 110,300,000   110,300,000    
Interest rate contracts          
Derivative Financial Instruments          
Notional Amount 21,600,000,000   21,600,000,000   20,900,000,000
Mortgage servicing rights hedging | Non-designated hedges          
Derivative Financial Instruments          
Notional Amount 63,000,000.0   63,000,000.0   35,000,000.0
Estimated gain (loss) on fair value     (1,200,000)   (163,000)
Mortgage servicing rights hedging | Non-designated hedges | Other Liabilities          
Derivative Financial Instruments          
Notional Amount 63,000,000   63,000,000   $ 35,000,000
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]         Noninterest Income, Other
Estimated Fair Value Loss     $ 1,168,000   $ 163,000
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]     Noninterest Income, Other    
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 909,000   $ 909,000   524,000
Mortgage loan pipeline commitments hedging | Non-designated hedges | Other Assets          
Derivative Financial Instruments          
Notional Amount 108,000,000   108,000,000   51,000,000
Estimated Fair Value Gain     $ 1,232,000   $ 800,000
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]     Noninterest Income, Other   Noninterest Income, Other
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 108,000,000   $ 108,000,000   $ 51,000,000
Fair value of forward commitments 323,000   323,000   276,000
Foreign exchange swaps          
Derivative Financial Instruments          
Gain or loss recorded 0 $ 0 0 $ 0  
Interest rate swap | Fair Value Hedging | Counterparty          
Derivative Financial Instruments          
Notional Amount 12,100,000   12,100,000   12,300,000
Interest rate swap | Fair Value Hedging | Other Assets | Counterparty          
Derivative Financial Instruments          
Notional Amount 12,078,000   12,078,000   12,289,000
Estimated Fair Value Gain     $ 422,000   $ 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 10,832,049,000   $ 10,832,049,000   $ 10,480,171,000
Estimated Fair Value Gain     $ 16,235,000   $ 8,539,000
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]     Noninterest Income, Other   Noninterest Income, Other
Estimated Fair Value Loss     $ 974,495,000   $ 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 $ 10,744,034,000   $ 10,744,034,000   $ 10,400,733,000
Estimated Fair Value Gain     $ 156,591,000   $ 201,263,000
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]     Noninterest Income, Other    
Estimated Fair Value Loss     $ 54,000    
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]     Noninterest Income, Other   Noninterest Income, Other