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Derivative Financial Instruments (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Derivative Financial Instruments |  |  |
Notional Amount | $ 29,748,406,000 |  | $ 28,513,557,000
Estimated Fair Value Gain | 177,262,000 |  | 161,490,000
Estimated Fair Value Loss | $ 698,933,000 |  | $ 879,855,000
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
Fair value of the interest rate swap derivatives, other assets | $ 175,100,000 |  | $ 160,300,000
Reduction in derivative asset fair value | 524,500,000 |  | 719,400,000
Fair value of the interest rate swap derivatives, other liabilities | 698,400,000,000 |  | 878,000,000,000
Estimated gain (loss) on fair value | 129,000 |  | (1,800,000)
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 | 112,826,000 |  | 59,291,000
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 | 97,758,000 |  | 53,177,000
Cash flow hedge | Borrower |  |  |
Derivative Financial Instruments |  |  |
Collateral provided | 262,400,000 |  |
Cash flow hedge | Interest-bearing deposits | Counterparty |  |  |
Derivative Financial Instruments |  |  |
Cash collateral | 43,900,000 |  |
Interest rate contracts |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 25,900,000,000 |  | 25,200,000,000
Mortgage servicing rights hedging | Non-designated hedges |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 157,000,000 |  | 129,000,000
Estimated Fair Value Gain | $ 129,000 |  |
Estimated Fair Value Loss |  |  | $ 1,809,000
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
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 | $ 1,978,000 |  | $ 751,000
Mortgage loan pipeline commitments hedging | Non-designated hedges |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 135,000,000 |  | 88,000,000
Estimated Fair Value Gain | 1,978,000 |  | $ 1,083,000
Estimated Fair Value Loss | $ 541,000 |  |
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
Forward commitments |  |  |
Derivative Financial Instruments |  |  |
Estimated Fair Value Loss | $ 541,000 |  | $ (333,000)
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments |  |  |
Obligation | 135,000,000 |  | 88,000,000
Customer swaps | Cash flow hedge |  |  |
Derivative Financial Instruments |  |  |
Collateral provided | 81,100,000 |  |
Foreign exchange swaps |  |  |
Derivative Financial Instruments |  |  |
Gain or loss recorded | 0 | $ 0 |
Interest rate swap |  |  |
Derivative Financial Instruments |  |  |
Gain or loss recorded | (172,000) | 113,000 |
Interest rate swap | Fair Value Hedging | Counterparty |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 3,898,000 |  | 3,945,000
Estimated Fair Value Gain | 79,000 |  | 107,000
Amortized cost basis of loans hedged | $ 3,800,000 |  | $ 3,800,000
Derivative, Gain, 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
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 | Borrower |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | $ 12,986,187,000 |  | $ 12,649,905,000
Estimated Fair Value Gain | 90,936,000 |  | 36,232,000
Estimated Fair Value Loss | $ 698,392,000 |  | $ 878,046,000
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 | Counterparty |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | $ 12,880,321,000 |  | $ 12,559,707,000
Estimated Fair Value Gain | 84,154,000 |  | 124,032,000
Total gross derivative instruments, before netting, Notional amount | 1,899,249,000 |  | 1,858,693,000
Total gross derivative instruments, before netting, Estimated fair value gain | 100,639,000 |  | (133,304,000)
Total gross derivative instruments, before netting, Estimated fair value loss | 3,094,000 |  | 708,000
Less: Netting adjustment, Notional amount | 172,329,000 |  | 49,000,000
Less: Netting adjustment, Estimated fair value gain | (3,094,000) |  | (708,000)
Less: Netting adjustment, Estimated fair value loss | (3,094,000) |  | (708,000)
Total gross derivative instruments, after netting, Notional amount | 1,899,249,000 |  | 1,858,693,000
Total gross derivative instruments, after netting, Estimated fair value gain | 97,545,000 |  | 132,596,000
Master netting arrangement collateral obligation to return cash offset against derivative asset | 43,900,000 |  | 53,900,000
Securities pledged | 30,000,000 |  | $ 30,400,000
Master netting arrangement collateral obligation cash paid offset against derivative asset | $ 1,900,000 |  |
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
Reduction in derivative asset fair value | $ 524,500,000 |  | $ 719,400,000
Interest rate swap | Economic hedges | Counterparty |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 3,586,000,000 |  | 3,083,000,000
Estimated Fair Value Gain | $ (14,000) | $ 1,000 | $ 36,000
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] | Noninterest Income, Other |  | Noninterest Income, Other
Estimated Fair Value Loss | $ 14,000 |  |
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] | Noninterest Income, Other |  | Noninterest Income, Other

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A + Details
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