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Derivative Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2020
Summary of the interest-rate swaps designated as cash flow hedges | A summary of the interest-rate swaps designated as cash flow hedges is presented below (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2020 | ​ |  | December 31, 2019 | ​
Notional amount | ​ | $ | 70,000 | ​ | ​ | $ | 70,000 | ​
Weighted average fixed pay rates | ​ |  | 1.80 | % | ​ |  | 1.80 | %
Weighted average variable 3 month LIBOR receive rates | ​ | ​ | 0.25 | % | ​ | ​ | 1.90 | %
Weighted average maturity | ​ | ​ | 3.11 | yrs | ​ | ​ | 3.86 | yrs
Unrealized gains (losses), net of tax | ​ | $ | (2,391) | ​ | ​ | $ | (200) | ​
Interest rate swap |
Summary of fair values of derivative assets and liabilities recorded in consolidated balance sheet | The fair values of derivative assets and liabilities related to derivatives for customers for interest rate swaps recorded in the unaudited Consolidated Balance Sheets are summarized as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | September 30, 2020 |  | ​ | December 31, 2019
Fair value recorded in other assets | ​ | $ | 38,144 | ​ | $ | 12,354
Fair value recorded in other liabilities | ​ | ​ | 38,144 | ​ | ​ | 12,354
Summary of gross gains and losses on derivative assets and liabilities recorded in non-interest income and expense in consolidated statements of income | The changes in fair value of these derivative assets and liabilities is recorded in non-interest expense in the unaudited Consolidated Statements of Income and summarized as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
​ | ​ | 2020 | ​ | 2019 | ​ | 2020 | ​ | 2019
Interest rate swaps - pay floating, receive fixed | ​ | $ | (549) | ​ | $ | 4,695 | ​ | $ | 25,790 | ​ | $ | 15,205
Interest rate swaps - pay fixed, receive floating | ​ | ​ | 549 | ​ | ​ | (4,695) | ​ | ​ | (25,790) | ​ | ​ | (15,205)
Total | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Interest rate contract |
Summary of gross gains and losses on derivative assets and liabilities recorded in non-interest income and expense in consolidated statements of income | The following table presents the net gains (losses) recorded in accumulated other comprehensive income (loss) and the unaudited Consolidated Statements of Income relating to cash flow derivative instruments for the period presented (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
Interest rate contracts | ​ | ​ | 2020 | ​ | ​ | ​ | 2019 | ​ | ​ | 2020 | ​ | ​ | 2019
Amount of gain (loss) recognized in OCI | ​ | $ | 14 | ​ | ​ | $ | (598) | ​ | $ | (2,233) | ​ | $ | (598)
Amount of (gain) loss reclassified from OCI to interest expense | ​ | ​ | 192 | ​ | ​ | ​ | 6 | ​ | ​ | 42 | ​ | ​ | 6
Interest rate lock commitments and forward sales commitments |
Summary of fair values of derivative assets and liabilities recorded in consolidated balance sheet | The fair values of derivative assets and liabilities related to interest rate lock commitments and forward sales commitments recorded in the unaudited Consolidated Balance Sheets are summarized as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2020 |  | December 31, 2019
Fair value recorded in other assets | ​ | $ | 1,567 | ​ | $ | 1,046
Fair value recorded in other liabilities | ​ |  | 4,036 | ​ | ​ | 2,187
Summary of gross gains and losses on derivative assets and liabilities recorded in non-interest income and expense in consolidated statements of income | The gross gains and losses on these derivative assets and liabilities related to interest rate lock commitments and forward sales commitments recorded in non-interest income in the unaudited Consolidated Statements of Income are summarized as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, |  | Nine Months Ended September 30,
​ | ​ | ​ | 2020 | ​ | ​ | 2019 | ​ | ​ | 2020 | ​ | ​ | 2019
Gross gains | ​ | $ | 4,014 | ​ | $ | 1,655 | ​ | $ | 15,379 | ​ | $ | 4,662
Gross (losses) | ​ |  | (4,036) | ​ | ​ | (1,706) | ​ |  | (16,354) | ​ | ​ | (4,773)
Net gains (losses) | ​ | $ | (22) | ​ | $ | (51) | ​ | $ | (975) | ​ | $ | (111)

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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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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + 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 + Details
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- Definition Tabular disclosure of interest rate derivatives, including, but not limited to, the fair value of the derivatives, statement of financial position location, and statement of financial performance location of these instruments. + References Reference 1: 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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