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Derivative Financial Instruments (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Derivative Financial Instruments |  |  |
Notional Amount | $ 20,157,553,000 |  | $ 19,342,657,000
Estimated Fair Value Gain | 416,329,000 |  | 813,899,000
Estimated Fair Value Loss | 402,256,000 |  | 804,832,000
Interest Rate Derivative Assets, at Fair Value | 398,200,000 |  | 802,800,000
Interest Rate Derivative Liabilities, at Fair Value | 398,200,000 |  | 802,700,000
Interest Rate Derivatives, at Fair Value, Net | 14,000 |  | 17,000
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 | (402,256,000) |  | (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 | 634,976,000 |  | 510,730,000
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 | 562,805,000 |  | 411,273,000
Cash flow hedge | Borrower |  |  |
Derivative Financial Instruments |  |  |
Collateral provided | 366,800,000 |  |
Interest rate contracts |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 19,400,000,000 |  | 18,600,000,000
Mortgage servicing rights hedging | Non-designated hedges |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 152,000,000.0 |  | 149,000,000.0
Estimated gain (loss) on fair value | (2,600,000) | $ 1,100,000 | 119,000
Mortgage servicing rights hedging | Non-designated hedges | Other Liabilities |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 152,000,000 |  | 149,000,000
Estimated Fair Value Gain |  |  | 119,000
Estimated Fair Value Loss | 2,631,000 |  |
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 | 10,524,000 |  | 15,328,000
Mortgage loan pipeline commitments hedging | Non-designated hedges | Other Assets |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 593,500,000 |  | 528,500,000
Estimated Fair Value Gain | 18,108,000 |  | 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 | 593,500,000 |  | 528,500,000
Fair value of forward commitments | 7,584,000 |  |
Fair value of forward commitments |  |  | (4,311,000)
Customer swaps | Cash flow hedge | Investment securities - available for sale |  |  |
Derivative Financial Instruments |  |  |
Collateral provided | 558,000,000.0 |  |
Foreign exchange swaps |  |  |
Derivative Financial Instruments |  |  |
Gain or loss recorded | 0 | 0 |
Interest rate swap | Fair Value Hedging | Counterparty |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 16,300,000 |  | 16,400,000
Gain or loss recorded | 0 | $ 0 |
Interest rate swap | Fair Value Hedging | Other Liabilities | Counterparty |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 16,307,000 |  | 16,439,000
Estimated Fair Value Loss | 1,390,000 |  | 2,086,000
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Borrower |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 9,697,873,000 |  | 9,324,359,000
Estimated Fair Value Gain | 393,424,000 |  | 802,717,000
Estimated Fair Value Loss | 120,458,000 |  | 46,000
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Counterparty |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 9,697,873,000 |  | 9,324,359,000
Estimated Fair Value Gain | 4,797,000 |  | 46,000
Estimated Fair Value Loss | $ 277,777,000 |  | $ 802,700,000

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