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Derivative Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2024
Derivative Financial Instruments |
Derivative financial instruments summary | ​
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​ | ​ | ​ | ​ | ​ | ​ | ​ | March 31, 2024 | ​ | ​ | ​ | ​ | December 31, 2023
​ | ​ | 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 Assets | ​ | $ | 9,099 | ​ | $ | 373 | ​ | $ | — | ​ | $ | 9,188 | ​ | $ | 220 | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Not designated hedges of interest rate risk: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Customer related interest rate contracts: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Matched interest rate swaps with borrowers | ​ | Other Assets and Other Liabilities | ​ | ​ | 11,513,291 | ​ | ​ | 29,960 | ​ | ​ | 954,297 | ​ | ​ | 11,327,419 | ​ | ​ | 60,145 | ​ | ​ | 803,539
Matched interest rate swaps with counterparty (1) | ​ | Other Assets | ​ | ​ | 11,422,100 | ​ | ​ | 144,041 | ​ | ​ | — | ​ | ​ | 11,235,952 | ​ | ​ | 108,820 | ​ | ​ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Economic hedges of interest rate risk: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Pay floating rate swap with counterparty | ​ | Other Assets | ​ | ​ | 1,760,000 | ​ | ​ | (1) | ​ | ​ | — | ​ | ​ | 1,660,000 | ​ | ​ | (5) | ​ | ​ | —
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Not designated hedges of interest rate risk – mortgage banking activities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Contracts used to hedge mortgage servicing rights | ​ | Other Assets | ​ | ​ | 107,000 | ​ | ​ | 381 | ​ | ​ | — | ​ | ​ | 142,000 | ​ | ​ | 2,605 | ​ | ​ | —
Contracts used to hedge mortgage pipeline | ​ | Other Assets and Other Liabilities | ​ | ​ | 123,000 | ​ | ​ | 2,030 | ​ | ​ | 491 | ​ | ​ | 77,500 | ​ | ​ | 1,154 | ​ | ​ | 947
Total derivatives | ​ | ​ | ​ | $ | 24,934,490 | ​ | $ | 176,784 | ​ | $ | 954,788 | ​ | $ | 24,452,059 | ​ | $ | 172,939 | ​ | $ | 804,486
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) |  | March 31, 2024 |  | December 31, 2023 |
Mortgage loan pipeline | ​ | $ | 117,590 | ​ | $ | 65,051 | ​
Expected closures | ​ |  | 102,911 | ​ |  | 54,993 | ​
Fair value of mortgage loan pipeline commitments | ​ |  | 2,030 | ​ |  | 1,154 | ​
Forward sales commitments | ​ |  | 123,000 | ​ |  | 77,500 | ​
Fair value of forward commitments | ​ |  | (491) | ​ |  | (947) | ​
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