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Derivative Financial Instruments (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Derivative Financial Instruments |  |  |
Notional Amount | $ 21,351,715,000 | $ 19,342,657,000 |
Estimated Fair Value Gain | 414,742,000 | 813,899,000 |
Estimated Fair Value Loss | 410,137,000 | 804,832,000 |
Gains (losses) on cash flow hedge in other comprehensive income |  | 10,800,000 |
Cash flow hedge liability | 0 |  |
Cash flow hedge assets |  | 30,300,000 |
Ineffectiveness in the cash flow hedge |  | 0 |
Gain or loss recorded | 0 | 0 |
Interest Rate Derivative Assets, at Fair Value | 408,800,000 | 802,800,000 |
Interest Rate Derivative Liabilities, at Fair Value | 408,800,000 | 802,700,000 |
Interest Rate Derivatives, at Fair Value, Net | 5,000 | 17,000,000,000 |
Estimated gain (loss) on fair value | 1,200,000 | (119,000) |
Termination value of obligations under agreement |  | 38,800,000 |
Interest expense | 51,629,000 | 83,564,000 | $ 86,552,000
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 | (410,137,000) | (804,832,000) |
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 | 264,000,000,000 | 510,730,000,000 |
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 | 233,265,000,000 | 411,273,000,000 |
Cash flow hedge |  |  |
Derivative Financial Instruments |  |  |
Collateral provided | 0 | 0 |
Cash flow hedge | Borrower |  |  |
Derivative Financial Instruments |  |  |
Collateral provided | 347,600,000 |  |
Interest rate contracts |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 20,800,000,000 | 18,600,000,000 |
Mortgage servicing rights hedging | Non-designated hedges |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 205,000,000.0 | 149,000,000.0 |
Mortgage servicing rights hedging | Non-designated hedges | Other Assets and Other Liabilities |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 205,000,000 | 149,000,000 |
Estimated Fair Value Gain | 1,228,000 | 119,000 |
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 | 4,759,000,000 | 15,328,000,000 |
Mortgage loan pipeline commitments hedging | Non-designated hedges | Other Assets |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 324,000,000 | 528,500,000 |
Estimated Fair Value Gain | 4,738,000 | 11,017,000 |
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 | 324,000,000,000 | 528,500,000,000 |
Fair value of forward commitments | (21,000,000) | (4,311,000,000) |
Customer swaps | Cash flow hedge | Investment securities - available for sale |  |  |
Derivative Financial Instruments |  |  |
Collateral provided | 348,800,000 |  |
Interest rate swap |  |  |
Derivative Financial Instruments |  |  |
Termination cost |  | 40,800,000 |
Interest expense |  | 2,000,000.0 |
Interest rate swap | Fair Value Hedging | Counterparty |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 15,700,000 | 16,400,000 |
Interest rate swap | Fair Value Hedging | Other Liabilities | Counterparty |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 15,716,000 | 16,439,000 |
Estimated Fair Value Loss | 1,355,000 | 2,086,000 |
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Borrower |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 10,404,605,000 | 9,324,359,000 |
Estimated Fair Value Gain | 408,776,000 | 802,717,000 |
Estimated Fair Value Loss | 69,998,000 | 46,000 |
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Counterparty |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 10,402,394,000 | 9,324,359,000 |
Estimated Fair Value Gain |  | 46,000 |
Estimated Fair Value Loss | 338,784,000 | 802,700,000 |
Foreign exchange contract |  |  |
Derivative Financial Instruments |  |  |
Gain or loss recorded | $ 0 | $ 0 |

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