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Derivative Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2021
Derivative Financial Instruments |
Derivative financial instruments summary | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | June 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 | ​ | $ | 16,175 | ​ | $ | — | ​ | $ | 1,583 | ​ | $ | 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 | ​ | ​ | 9,906,849 | ​ | ​ | 516,632 | ​ | ​ | 46,982 | ​ | ​ | 9,324,359 | ​ | ​ | 802,717 | ​ | ​ | 46
Matched interest rate swaps with counterparty | ​ | Other Assets and Other Liabilities | ​ | ​ | 9,915,172 | ​ | ​ | — | ​ | ​ | 469,656 | ​ | ​ | 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 | ​ | ​ | 170,000 | ​ | ​ | 586 | ​ | ​ | — | ​ | ​ | 149,000 | ​ | ​ | 119 | ​ | ​ | —
Contracts used to hedge mortgage pipeline | ​ | Other Assets | ​ | ​ | 386,500 | ​ | ​ | 8,927 | ​ | ​ | — | ​ | ​ | 528,500 | ​ | ​ | 11,017 | ​ | ​ | —
Total derivatives | ​ | ​ | ​ | $ | 20,394,696 | ​ | $ | 526,145 | ​ | $ | 518,221 | ​ | $ | 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) |  | June 30, 2021 |  | December 31, 2020 |
Mortgage loan pipeline | ​ | $ | 402,636 | ​ | $ | 510,730 | ​
Expected closures | ​ |  | 348,530 | ​ |  | 411,273 | ​
Fair value of mortgage loan pipeline commitments | ​ |  | 9,426 | ​ |  | 15,328 | ​
Forward sales commitments | ​ |  | 386,500 | ​ |  | 528,500 | ​
Fair value of forward commitments | ​ |  | (500) | ​ |  | (4,311) | ​

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4E -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624181-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details
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