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Derivative Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2019
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): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2019 | ​ |  | December 31, 2018 | ​
Notional amount | ​ | $ | 70,000 | ​ | ​ | $ | — | ​
Weighted average fixed pay rates | ​ |  | 1.80 | % | ​ |  | — | %
Weighted average variable 3 month LIBOR receive rates | ​ | ​ | 1.90 | % | ​ | ​ | — | %
Weighted average maturity | ​ | ​ | 3.86 | yrs | ​ | ​ | — | yrs
Unrealized gains (losses) | ​ | $ | (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 Consolidated Balance Sheets are summarized as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | December 31, 2019 |  | ​ | December 31, 2018
Fair value recorded in other assets | ​ | $ | 12,354 | ​ | $ | 1,438
Fair value recorded in other liabilities | ​ | ​ | 12,354 | ​ | ​ | 1,438
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 recorded in non-interest income and expense in the Consolidated Statements of Income for the year ended December 31, 2019, 2018 and 2017 are summarized as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019 | ​ | December 31, 2018 | ​ | December 31, 2017
Gross gains | ​ | $ | 10,915 | ​ | $ | 1,176 | ​ | $ | 262
Gross losses | ​ | ​ | (10,915) | ​ | ​ | (1,176) | ​ | ​ | (262)
Net gains (losses) | ​ | $ | — | ​ | $ | — | ​ | $ | —
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 and the Consolidated Statements of Income relating to cash flow derivative instruments for the periods presented (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, 2019
​ | ​ | ​ | Amount of (gain) loss recognized in OCI | ​ | ​ | ​ | Amount of (gain) loss reclassified from OCI to interest expense | ​
Interest rate contracts | ​ | $ | (202) | ​ | ​ | $ | 2 | ​
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 Consolidated Balance Sheets are summarized as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2019 |  | December 31, 2018
Fair value recorded in other assets | ​ | $ | 1,046 | ​ | $ | 624
Fair value recorded in other liabilities | ​ |  | 2,187 | ​ | ​ | 1,205
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 and expense in the Consolidated Statements of Income for the 12 months ended December 31, 2019, 2018 and 2017 are summarized as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019 | ​ | December 31, 2018 |  | December 31, 2017
Gross gains | ​ | $ | 7,003 | ​ | $ | 3,494 | ​ | $ | 14,724
Gross (losses) | ​ |  | (6,960) | ​ | ​ | (3,874) | ​ | ​ | (13,250)
Net gains (losses) | ​ | $ | 43 | ​ | $ | (380) | ​ | $ | 1,474

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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=109980867&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=109980867&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=109980867&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=109980867&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=109980867&loc=SL5624171-113959 + Details
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