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Other comprehensive income (loss) (Tables) | 6 Months Ended
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Jun. 30, 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 June 30, 2021
​ |  | ​ |  | ​ | ​ | ​ |  | Accumulated
​ | ​ | Securities | ​ | Fair Value | ​ | Other
​ | ​ | Available-for- | ​ | Municipal | ​ | Comprehensive
​ |  | Sale |  | Security Hedges |  | Income (Loss)
Beginning balance, March 31, 2021 |  | $ | 898 | ​ | $ | 185 | ​ | $ | 1,083
​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income | ​ |  | 1,153 | ​ |  | 102 | ​ |  | 1,255
Reclassification of amounts included in net income | ​ |  | — | ​ |  | — | ​ |  | —
Net other comprehensive income during period | ​ |  | 1,153 | ​ |  | 102 | ​ |  | 1,255
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending balance, June 30, 2021 | ​ | $ | 2,051 | ​ | $ | 287 | ​ | $ | 2,338
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended June 30, 2020
​ |  | ​ |  | ​ | ​ | ​ |  | Accumulated
​ | ​ | Securities | ​ | Fair Value | ​ | Other
​ | ​ | Available-for- | ​ | Municipal | ​ | Comprehensive
​ |  | Sale |  | Security Hedges |  | Income (Loss)
Beginning balance, March 31, 2020 | ​ | $ | 1,242 | ​ | $ | (2,489) | ​ | $ | (1,247)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income | ​ |  | 1,414 | ​ |  | 413 | ​ |  | 1,827
Reclassification of amounts included in net income | ​ |  | 12 | ​ |  | — | ​ |  | 12
Net other comprehensive income during period | ​ |  | 1,426 | ​ |  | 413 | ​ |  | 1,839
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending balance, June 30, 2020 | ​ | $ | 2,668 | ​ | $ | (2,076) | ​ | $ | 592
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended June 30, 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) | ​ |  | (917) | ​ |  | 1,072 | ​ |  | 155
Reclassification of amounts included in net income | ​ |  | — | ​ |  | — | ​ |  | —
Net other comprehensive income (loss) during period | ​ |  | (917) | ​ |  | 1,072 | ​ |  | 155
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending balance, June 30, 2021 | ​ | $ | 2,051 | ​ | $ | 287 | ​ | $ | 2,338
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended June 30, 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) | ​ |  | 2,265 | ​ |  | (1,853) | ​ |  | 412
Reclassification of amounts included in net income | ​ |  | 12 | ​ |  | — | ​ |  | 12
Net other comprehensive income (loss) during period | ​ |  | 2,277 | ​ |  | (1,853) | ​ |  | 424
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending balance, June 30, 2020 | ​ | $ | 2,668 | ​ | $ | (2,076) | ​ | $ | 592

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