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Derivative Financial Instruments (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Derivative Financial Instruments          
Notional Amount $ 21,540,387,000   $ 21,540,387,000   $ 21,351,715,000
Estimated Fair Value Gain     668,384,000   414,742,000
Estimated Fair Value Loss     666,862,000   410,137,000
Gain or loss recorded 68,000   110,000    
Fair value of the interest rate swap derivatives, other assets 666,600,000   666,600,000   408,800,000
Fair value of the interest rate swap derivatives, other liabilities 666,500,000   666,500,000   408,800,000
Fair value of the interest rate swap derivatives, net assets and liability 33,000   33,000   5,000
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 (666,802,000)   (666,802,000)   (410,137,000)
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 128,216,000   128,216,000   264,000,000
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 112,258,000   112,258,000   233,265,000
Cash flow hedge | Borrower          
Derivative Financial Instruments          
Collateral provided 61,200,000   61,200,000    
Cash flow hedge | Investment securities - available for sale | Counterparty          
Derivative Financial Instruments          
Collateral provided 129,000,000.0   129,000,000.0    
Cash flow hedge | Interest-bearing deposits (Liability) | Counterparty          
Derivative Financial Instruments          
Cash collateral 506,200,000   506,200,000    
Interest rate contracts          
Derivative Financial Instruments          
Notional Amount 21,300,000,000   21,300,000,000   20,800,000,000
Mortgage servicing rights hedging | Non-designated hedges          
Derivative Financial Instruments          
Notional Amount 50,000,000.0   50,000,000.0   205,000,000.0
Estimated gain (loss) on fair value     299,000   1,200,000
Mortgage servicing rights hedging | Non-designated hedges | Other Assets and Other Liabilities          
Derivative Financial Instruments          
Notional Amount 50,000,000   50,000,000   205,000,000
Estimated Fair Value Gain         1,228,000
Estimated Fair Value Loss     299,000    
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 2,105,000   2,105,000   4,759,000
Mortgage loan pipeline commitments hedging | Non-designated hedges | Other Assets          
Derivative Financial Instruments          
Notional Amount 149,500,000   149,500,000   324,000,000
Estimated Fair Value Gain     1,854,000   4,738,000
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 149,500,000   149,500,000   324,000,000
Fair value of forward commitments (251,000)   (251,000)   (21,000)
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 17,900,000   17,900,000   15,700,000
Gain or loss recorded         0
Interest rate swap | Fair Value Hedging | Other Liabilities | Counterparty          
Derivative Financial Instruments          
Notional Amount 17,940,000   17,940,000   15,716,000
Estimated Fair Value Loss     60,000   1,355,000
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Borrower          
Derivative Financial Instruments          
Notional Amount 10,673,938,000   10,673,938,000   10,404,605,000
Estimated Fair Value Gain     30,587,000   408,776,000
Estimated Fair Value Loss     665,970,000   69,998,000
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Counterparty          
Derivative Financial Instruments          
Notional Amount $ 10,649,009,000   10,649,009,000   10,402,394,000
Estimated Fair Value Gain     635,943,000    
Estimated Fair Value Loss     $ 533,000   $ 338,784,000