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Derivative Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2019
Derivative Financial Instruments |
Derivative financial instruments summary | ​
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​ | ​ | ​ | ​ | ​ | ​ | ​ | December 31, 2019 | ​ | ​ | ​ | ​ | December 31, 2018
​ | ​ | Balance Sheet | ​ | Notional | ​ | Estimated Fair Value | ​ | Notional | ​ | Estimated Fair Value
(Dollars in thousands) |  | Location |  | Amount |  | Gain |  | Loss |  | Amount |  | Gain |  | Loss
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Cash flow hedges of interest rate risk on Junior Subordinated Debt: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Pay fixed rate swap with counterparty | ​ | Other Liabilities | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 8,000 | ​ | $ | — | ​ | $ | 48
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Cash flow hedges of interest rate risk on FHLB Advances: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Pay fixed rate swap with counterparty | ​ | Other Liabilities | ​ | $ | 700,000 | ​ | $ | — | ​ | $ | 13,791 | ​ | $ | — | ​ | $ | — | ​ | $ | —
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Fair value hedge of interest rate risk: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Pay fixed rate swap with counterparty | ​ | Other Assets and Other Liabilities | ​ | $ | 2,754 | ​ | $ | — | ​ | $ | 199 | ​ | $ | 2,824 | ​ | $ | — | ​ | $ | 51
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Not designated hedges of interest rate risk: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Customer related interest rate contracts: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Matched interest rate swaps with borrowers | ​ | Other Assets and Other Liabilities | ​ | $ | 564,068 | ​ | $ | 15,277 | ​ | $ | 1,019 | ​ | $ | 368,513 | ​ | $ | 3,105 | ​ | $ | 4,193
Matched interest rate swaps with counterparty | ​ | Other Assets and Other Liabilities | ​ | $ | 564,068 | ​ | $ | 73 | ​ | $ | 15,475 | ​ | $ | 368,513 | ​ | $ | 718 | ​ | $ | 129
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Not designated hedges of interest rate risk - mortgage banking activities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Contracts used to hedge mortgage servicing rights | ​ | Other Assets and Other Liabilities | ​ | $ | 133,000 | ​ | $ | — | ​ | $ | 789 | ​ | $ | 94,500 | ​ | $ | 1,184 | ​ | $ | —
Forward sales commitments used to hedge mortgage pipeline | ​ | Other Assets | ​ | $ | 87,773 | ​ | $ | 902 | ​ | $ | — | ​ | $ | 46,812 | ​ | $ | 83 | ​ | $ | —
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Total derivatives | ​ | ​ | ​ | $ | 2,051,663 | ​ | $ | 16,252 | ​ | $ | 31,273 | ​ | $ | 889,162 | ​ | $ | 5,090 | ​ | $ | 4,421
Schedule of notional value of forward sale commitments and the fair value of those obligations along with the fair value of the mortgage pipeline | ​
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​ | ​ | December 31,
(Dollars in thousands) |  | 2019 |  | 2018
Mortgage loan pipeline | ​ | $ | 80,785 | ​ | $ | 50,442
Expected closures | ​ |  | 60,588 | ​ |  | 37,832
Fair value of mortgage loan pipeline commitments | ​ |  | 1,160 | ​ |  | 705
Forward sales commitments | ​ |  | 87,773 | ​ |  | 46,812
Fair value of forward commitments | ​ |  | (258) | ​ |  | (621)

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