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Derivative Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2021
Derivative Financial Instruments |
Derivative financial instruments summary | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | September 30, 2021 | ​ | ​ | ​ | ​ | December 31, 2020
​ | ​ | Balance Sheet | ​ | Notional | ​ | Estimated Fair Value | ​ | Notional | ​ | Estimated Fair Value
(Dollars in thousands) |  | Location |  | Amount |  | Gain |  | Loss |  | Amount |  | Gain |  | Loss
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value hedge of interest rate risk: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Pay fixed rate swap with counterparty | ​ | Other Liabilities | ​ | $ | 16,042 | ​ | $ | — | ​ | $ | 1,499 | ​ | $ | 16,439 | ​ | $ | — | ​ | $ | 2,086
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Not designated hedges of interest rate risk: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Customer related interest rate contracts: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Matched interest rate swaps with borrowers | ​ | Other Assets and Other Liabilities | ​ | ​ | 10,112,896 | ​ | ​ | 480,600 | ​ | ​ | 52,959 | ​ | ​ | 9,324,359 | ​ | ​ | 802,717 | ​ | ​ | 46
Matched interest rate swaps with counterparty | ​ | Other Assets and Other Liabilities | ​ | ​ | 10,121,166 | ​ | ​ | — | ​ | ​ | 427,646 | ​ | ​ | 9,324,359 | ​ | ​ | 46 | ​ | ​ | 802,700
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Not designated hedges of interest rate risk - mortgage banking activities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Contracts used to hedge mortgage servicing rights | ​ | Other Assets and Other Liabilities | ​ | ​ | 185,000 | ​ | ​ | — | ​ | ​ | 2,903 | ​ | ​ | 149,000 | ​ | ​ | 119 | ​ | ​ | —
Contracts used to hedge mortgage pipeline | ​ | Other Assets | ​ | ​ | 466,500 | ​ | ​ | 8,485 | ​ | ​ | — | ​ | ​ | 528,500 | ​ | ​ | 11,017 | ​ | ​ | —
Total derivatives | ​ | ​ | ​ | $ | 20,901,604 | ​ | $ | 489,085 | ​ | $ | 485,007 | ​ | $ | 19,342,657 | ​ | $ | 813,899 | ​ | $ | 804,832
Schedule of notional value of forward sale commitments and the fair value of those obligations along with the fair value of the mortgage pipeline | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | September 30, 2021 |  | December 31, 2020 |
Mortgage loan pipeline | ​ | $ | 432,063 | ​ | $ | 510,730 | ​
Expected closures | ​ |  | 385,210 | ​ |  | 411,273 | ​
Fair value of mortgage loan pipeline commitments | ​ |  | 6,319 | ​ |  | 15,328 | ​
Forward sales commitments | ​ |  | 466,500 | ​ |  | 528,500 | ​
Fair value of forward commitments | ​ |  | 2,166 | ​ |  | (4,311) | ​

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