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Derivative Financial Instruments (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Derivative Financial Instruments      
Notional Amount $ 21,487,939,000   $ 20,979,193,000
Estimated Fair Value Gain $ 159,286,000   $ 211,016,000
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] Noninterest Income, Other   Noninterest Income, Other
Estimated Fair Value Loss $ 806,584,000   $ 1,034,143,000
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] Noninterest Income, Other   Noninterest Income, Other
Net gain $ 96,000 $ 41,000  
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Noninterest Income, Other    
Reduction in derivative liability fair value $ 650,000,000.0   $ 824,300,000
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 (806,584,000)   (1,034,143,000)
Other Liabilities      
Derivative Financial Instruments      
Fair value of the interest rate swap derivatives, other liabilities 806,600,000,000   1,000,000,000.0
Other Assets      
Derivative Financial Instruments      
Fair value of the interest rate swap derivatives, other assets 156,800,000   209,800,000
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 107,831,000   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 90,737,000   37,210,000
Cash flow hedge      
Derivative Financial Instruments      
Collateral provided 0   0
Cash flow hedge | Cash and Cash Equivalents | Borrower      
Derivative Financial Instruments      
Collateral provided 222,700,000    
Cash flow hedge | Interest-bearing deposits | Counterparty      
Derivative Financial Instruments      
Cash collateral 100,300,000    
Interest rate contracts      
Derivative Financial Instruments      
Notional Amount 21,300,000,000   20,900,000,000
Mortgage servicing rights hedging | Non-designated hedges      
Derivative Financial Instruments      
Notional Amount 67,500,000   35,000,000.0
Estimated gain (loss) on fair value 1,200,000   163,000
Mortgage servicing rights hedging | Non-designated hedges | Other Assets and Other Liabilities      
Derivative Financial Instruments      
Notional Amount 67,500,000   $ 35,000,000
Estimated Fair Value Gain $ 1,158,000    
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]     Noninterest Income, Other
Estimated Fair Value Loss     $ 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 $ 1,848,000   524,000
Mortgage loan pipeline commitments hedging | Non-designated hedges | Other Assets      
Derivative Financial Instruments      
Notional Amount 100,500,000   51,000,000
Estimated Fair Value Gain $ 1,115,000   $ 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 $ 100,500,000   $ 51,000,000
Fair value of forward commitments (734,000)   276,000
Customer swaps | Cash flow hedge      
Derivative Financial Instruments      
Collateral provided 113,200,000    
Foreign exchange swaps      
Derivative Financial Instruments      
Gain or loss recorded 0 $ 0  
Interest rate swap | Fair Value Hedging | Counterparty      
Derivative Financial Instruments      
Notional Amount 12,200,000   12,300,000
Interest rate swap | Fair Value Hedging | Other Liabilities | Counterparty      
Derivative Financial Instruments      
Notional Amount 12,186,000   12,289,000
Estimated Fair Value Gain $ 206,000   $ 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 $ 10,701,004,000   $ 10,480,171,000
Estimated Fair Value Gain $ 28,580,000   $ 8,539,000
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] Noninterest Income, Other   Noninterest Income, Other
Estimated Fair Value Loss $ 805,749,000   $ 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 $ 10,606,749,000   $ 10,400,733,000
Estimated Fair Value Gain $ 128,227,000   $ 201,263,000
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] Noninterest Income, Other    
Estimated Fair Value Loss $ 835,000    
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] Noninterest Income, Other   Noninterest Income, Other