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DERIVATIVES (Tables) | 9 Months Ended
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Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Summary of the Derivatives | The following table summarizes key elements of the Company’s derivative instruments as of September 30, 2020 and December 31, 2019, segregated by derivatives that are considered accounting hedges and those that are not (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2020 |  | December 31, 2019
​ | ​ | ​ | ​ | ​ | Derivative (2) | ​ | ​ | ​ | ​ | Derivative (2)
​ |  | Notional or |  | ​ | ​ |  | ​ | ​ |  | Notional or |  | ​ | ​ |  | ​ | ​
​ | ​ | Contractual | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Contractual | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amount (1) | ​ | Assets | ​ | Liabilities | ​ | Amount (1) | ​ | Assets | ​ | Liabilities
Derivatives designated as accounting hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest rate contracts: |  | ​ | ​ |  | ​ |  |  | ​ |  | ​ | ​ | ​ |  | ​ |  |  | ​ |
Cash flow hedges | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 100,000 | ​ | $ | — | ​ | $ | 1,147
Fair value hedges | ​ |  | 125,856 | ​ |  | — | ​ |  | 13,912 | ​ |  | 133,078 | ​ |  | 182 | ​ |  | 6,256
Derivatives not designated as accounting hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Loan Swaps : | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Pay fixed - receive floating interest rate swaps | ​ |  | 2,192,085 | ​ |  | — | ​ |  | 187,299 | ​ |  | 1,575,149 | ​ |  | 753 | ​ |  | 53,592
Pay floating - receive fixed interest rate swaps | ​ |  | 2,192,085 | ​ |  | 187,299 | ​ |  | — | ​ |  | 1,575,149 | ​ |  | 53,592 | ​ |  | 753
​
(1) | Notional amounts are not recorded on the Company’s Consolidated Balance Sheets and are generally used only as a basis on which interest and other payments are determined.
(2) | Balances represent fair value of derivative financial instruments.
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location | The following table summarizes the carrying value of the Company’s hedged assets in fair value hedges and the associated cumulative basis adjustments included in those carrying values as of September 30, 2020 and December 31, 2019 (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2020 | ​ | December 31, 2019
​ |  | ​ | ​ |  | Cumulative |  | ​ |  | Cumulative
​ | ​ | ​ | ​ | ​ | Amount of Basis | ​ | ​ | ​ | Amount of Basis
​ | ​ | ​ | ​ | ​ | Adjustments | ​ | ​ | ​ | Adjustments
​ | ​ | ​ | ​ | ​ | Included in the | ​ | ​ | ​ | Included in the
​ | ​ | Carrying Amount | ​ | Carrying | ​ | Carrying Amount | ​ | Carrying
​ | ​ | of Hedged | ​ | Amount of the | ​ | of Hedged | ​ | Amount of the
​ | ​ | Assets/(Liabilities) | ​ | Hedged | ​ | Assets/(Liabilities) | ​ | Hedged
​ | ​ | Amount (1) |  | Assets/(Liabilities) | ​ | Amount (1) |  | Assets/(Liabilities)
Line items on the Consolidated Balance Sheets in which the hedged item is included: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Securities available-for-sale (1) (2) | ​ | $ | 179,908 | ​ | $ | 7,992 | ​ | $ | 206,799 | ​ | $ | 4,072
Loans | ​ |  | 75,856 | ​ |  | 5,830 | ​ |  | 83,078 | ​ |  | 1,972
​
(1) | These amounts include the amortized cost basis of the investment securities designated in hedging relationships for which the hedged item is the last layer expected to be remaining at the end of the hedging relationship. At September 30, 2020 and December 31, 2019, the amortized cost basis of this portfolio was $180 million and $207 million, respectively and the cumulative basis adjustment associated with this hedge was $8.0 million and $4.1 million, respectively. The amount of the designated hedged item was $50 million.
(2) | Carrying value represents amortized cost.

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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121590274&loc=d3e41620-113959 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121590274&loc=d3e41638-113959 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590274&loc=d3e41678-113959 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121590274&loc=d3e41641-113959 Reference 8: 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 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579240-113959 + Details
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