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Derivative Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 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): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31, | ​
​ |  | 2020 |  | 2019 | ​
Notional amount | ​ | $ | 70,000 | ​ | $ | 70,000 | ​
Weighted average fixed pay rates | ​ |  | 1.80 | % |  | 1.80 | %
Weighted average variable 3-month LIBOR receive rates | ​ | ​ | 0.22 | % | ​ | 1.90 | %
Weighted average maturity, in years | ​ | ​ | 2.85 | yrs | ​ | 3.86 | yrs
Unrealized gains (losses), net of tax | ​ | $ | (2,184) | ​ | $ | (200) | ​
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 reflects the net gains (losses) recorded in accumulated other comprehensive income (loss) and the Consolidated Statements of Income relating to cash flow derivative instruments for the periods presented (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
Interest rate contracts |  | ​ | 2020 |  | ​ | 2019
Amount of gain (loss) recognized in OCI | ​ | $ | (2,526) | ​ | $ | (202)
Amount of (gain) loss reclassified from OCI to interest expense | ​ | ​ | 542 | ​ | ​ | 2
​
Interest rate swap | Not designated as hedging |
Summary of fair values of derivative assets and liabilities recorded in consolidated balance sheet | The following table reflects the amount and fair value of derivative assets and liabilities related to customer interest rate swaps recorded in the Consolidated Balance Sheets for the periods presented (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Derivative Asset | ​ | Derivative Liability
​ | ​ | Notional | ​ | Fair | ​ | Notional | ​ | Fair
December 31, 2020 |  | Amount |  | Value |  | Amount |  | Value
Interest rate swaps - pay floating, receive fixed | ​ | $ | 394,954 | ​ | $ | 32,685 | ​ | $ | — | ​ | $ | —
Interest rate swaps - pay fixed, receive floating | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 394,954 | ​ | ​ | 32,685
Derivatives not designated as hedging instruments | ​ | $ | 394,954 | ​ | $ | 32,685 | ​ | $ | 394,954 | ​ | $ | 32,685
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Derivative Asset | ​ | Derivative Liability
​ | ​ | Notional | ​ | Fair | ​ | Notional | ​ | Fair
December 31, 2019 |  | Amount |  | Value |  | Amount |  | Value
Interest rate swaps - pay floating, receive fixed | ​ | $ | 290,418 | ​ | $ | 12,354 | ​ | $ | — | ​ | $ | —
Interest rate swaps - pay fixed, receive floating | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 290,418 | ​ | ​ | 12,354
Derivatives not designated as hedging instruments | ​ | $ | 290,418 | ​ | $ | 12,354 | ​ | $ | 290,418 | ​ | $ | 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 | Changes in fair value of these derivative assets and liabilities are recorded in non-interest expense in the Consolidated Statements of Income and summarized as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Years Ended December 31,
​ |  | Location |  | 2020 |  | 2019 |  | 2018
Interest rate swaps - pay floating, receive fixed | ​ | Non-interest expense | ​ | $ | 20,331 | ​ | $ | 10,915 | ​ | $ | 1,176
Interest rate swaps - pay fixed, receive floating | ​ | Non-interest expense | ​ | ​ | (20,331) | ​ | ​ | (10,915) | ​ | ​ | (1,176)
Net change in fair value of interest rate swaps | ​ | ​ | ​ | ​ | $ | — | ​ | $ | — | ​ | $ | —
Interest rate lock commitments and forward sales commitments | Designated as hedging instrument |
Summary of fair values of derivative assets and liabilities recorded in consolidated balance sheet | The following table reflects the amount and fair value of mortgage banking derivatives included in the Consolidated Balance Sheets for the periods presented (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | December 31, 2020 | ​ | December 31, 2019
​ | ​ | ​ | ​ | ​ | Notional | ​ | Fair | ​ | Notional | ​ | Fair
Derivatives with positive fair value |  | Location |  | Amount |  | Value |  | Amount |  | Value
Interest rate lock commitments | ​ | Other assets | ​ | $ | 45,004 | ​ | $ | 1,201 | ​ | $ | 67,965 | ​ | $ | 1,032
Forward sales commitments | ​ | Other assets | ​ | ​ | 978 | ​ | ​ | 32 | ​ | ​ | 1,773 | ​ | ​ | 14
Mortgage banking derivatives recorded in other assets | ​ | $ | 45,982 | ​ | $ | 1,233 | ​ | $ | 69,738 | ​ | $ | 1,046
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Derivatives with negative fair value | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest rate lock commitments | ​ | Other liabilities | ​ | $ | 118 | ​ | $ | 1 | ​ | $ | 1,114 | ​ | $ | 11
Forward sales commitments | ​ | Other liabilities | ​ | ​ | 84,964 | ​ | ​ | 2,662 | ​ | ​ | 133,482 | ​ | ​ | 2,176
Mortgage banking derivatives recorded in other liabilities | ​ | $ | 85,082 | ​ | $ | 2,663 | ​ | $ | 134,596 | ​ | $ | 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 | Net gains (losses) relating to these derivative instruments are summarized as follows for the periods presented (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Years Ended December 31,
​ |  | Location |  | 2020 |  | 2019 |  | 2018
Interest rate lock commitments | ​ | Mortgage revenue | ​ | $ | 9,667 | ​ | $ | 3,988 | ​ | $ | 1,757
Forward sales commitments | ​ | Mortgage revenue | ​ |  | (18,329) | ​ | ​ | (6,751) | ​ | ​ | (3,110)
Net gains (losses) | ​ | ​ | ​ | ​ | $ | (8,662) | ​ | $ | (2,763) | ​ | $ | (1,353)

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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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