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Derivative Financial Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Derivative Financial Instruments |  |  |  |  |
Notional Amount | $ 20,901,604 |  | $ 20,901,604 |  | $ 19,342,657
Estimated Fair Value Gain |  |  | 489,085 |  | 813,899
Estimated Fair Value Loss |  |  | 485,007 |  | 804,832
Interest Rate Derivative Assets, at Fair Value | 480,600 |  | 480,600 |  | 802,800
Interest Rate Derivative Liabilities, at Fair Value | 480,600 |  | 480,600 |  | 802,700
Interest Rate Derivatives, at Fair Value, Net | 5 |  | 5 |  | 17
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 | (485,007) |  | (485,007) |  | (804,832)
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 | 432,063 |  | 432,063 |  | 510,730
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 | 385,210 |  | 385,210 |  | 411,273
Cash flow hedge | Borrower |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Collateral provided | 372,500 |  | 372,500 |  |
Interest rate contracts |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 20,200,000 |  | 20,200,000 |  | 18,600,000
Mortgage servicing rights hedging | Non-designated hedges |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 185,000 |  | 185,000 |  | 149,000
Estimated gain (loss) on fair value |  |  | (2,900) | $ 389 |
Mortgage servicing rights hedging | Non-designated hedges | Other Assets and Other Liabilities |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 185,000 |  | 185,000 |  | 149,000
Estimated Fair Value Gain |  |  |  |  | 119
Estimated Fair Value Loss |  |  | 2,903 |  |
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 | 6,319 |  | 6,319 |  | 15,328
Mortgage loan pipeline commitments hedging | Non-designated hedges | Other Assets |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 466,500 |  | 466,500 |  | 528,500
Estimated Fair Value Gain |  |  | 8,485 |  | 11,017
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 | 466,500 |  | 466,500 |  | 528,500
Fair value of forward commitments | 2,166 |  | 2,166 |  | (4,311)
Customer swaps | Cash flow hedge | Investment securities - available for sale |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Collateral provided | 429,100 |  | 429,100 |  |
Foreign exchange swaps |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Gain or loss recorded | 0 | $ 0 |  |  |
Interest rate swap | Fair Value Hedging | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 16,000 |  | 16,000 |  | 16,400
Gain or loss recorded | 0 |  | 0 |  |
Interest rate swap | Fair Value Hedging | Other Liabilities | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 16,042 |  | 16,042 |  | 16,439
Estimated Fair Value Loss |  |  | 1,499 |  | 2,086
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Borrower |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 10,112,896 |  | 10,112,896 |  | 9,324,359
Estimated Fair Value Gain |  |  | 480,600 |  | 802,717
Estimated Fair Value Loss |  |  | 52,959 |  | 46
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | $ 10,121,166 |  | 10,121,166 |  | 9,324,359
Estimated Fair Value Gain |  |  |  |  | 46
Estimated Fair Value Loss |  |  | $ 427,646 |  | $ 802,700

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