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Other comprehensive income (loss) (Tables) | 3 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Summary of Accumulated Other Comprehensive Income (Loss) | The changes in each component of accumulated other comprehensive income (loss), net of tax, were as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, 2021
​ |  | ​ |  | ​ | ​ | ​ |  | Accumulated
​ | ​ | Securities | ​ | Fair Value | ​ | Other
​ | ​ | Available-for- | ​ | Municipal | ​ | Comprehensive
​ |  | Sale |  | Security Hedges |  | Income (Loss)
Beginning balance, December 31, 2020 |  | $ | 2,968 | ​ | $ | (785) | ​ | $ | 2,183
​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income (loss) | ​ |  | (2,070) | ​ |  | 970 | ​ |  | (1,100)
Reclassification of amounts included in net income | ​ |  | — | ​ |  | — | ​ |  | —
Net other comprehensive income (loss) during period | ​ |  | (2,070) | ​ |  | 970 | ​ |  | (1,100)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending balance, March 31, 2021 | ​ | $ | 898 | ​ | $ | 185 | ​ | $ | 1,083
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, 2020
​ |  | ​ |  | ​ | ​ | ​ |  | Accumulated
​ | ​ | Securities | ​ | Fair Value | ​ | Other
​ | ​ | Available-for- | ​ | Municipal | ​ | Comprehensive
​ |  | Sale |  | Security Hedges |  | Income (Loss)
Beginning balance, December 31, 2019 | ​ | $ | 391 | ​ | $ | (223) | ​ | $ | 168
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income (loss) | ​ |  | 851 | ​ |  | (2,266) | ​ |  | (1,415)
Reclassification of amounts included in net income | ​ |  | — | ​ |  | — | ​ |  | —
Net other comprehensive income (loss) during period | ​ |  | 851 | ​ |  | (2,266) | ​ |  | (1,415)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending balance, March 31, 2020 | ​ | $ | 1,242 | ​ | $ | (2,489) | ​ | $ | (1,247)

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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