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Other comprehensive income (loss) (Tables) | 9 Months Ended
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Sep. 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 September 30, 2021
​ |  | ​ |  | ​ | ​ | ​ |  | Accumulated
​ | ​ | Securities | ​ | Fair Value | ​ | Other
​ | ​ | Available-for- | ​ | Municipal | ​ | Comprehensive
​ |  | Sale |  | Security Hedges |  | Income (Loss)
Beginning balance, June 30, 2021 |  | $ | 2,051 | ​ | $ | 287 | ​ | $ | 2,338
​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income | ​ |  | 210 | ​ |  | 44 | ​ |  | 254
Reclassification of amounts included in net income | ​ |  | (33) | ​ |  | — | ​ |  | (33)
Net other comprehensive income during period | ​ |  | 177 | ​ |  | 44 | ​ |  | 221
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending balance, September 30, 2021 | ​ | $ | 2,228 | ​ | $ | 331 | ​ | $ | 2,559
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended September 30, 2020
​ |  | ​ |  | ​ | ​ | ​ |  | Accumulated
​ | ​ | Securities | ​ | Fair Value | ​ | Other
​ | ​ | Available-for- | ​ | Municipal | ​ | Comprehensive
​ |  | Sale |  | Security Hedges |  | Income (Loss)
Beginning balance, June 30, 2020 | ​ | $ | 2,668 | ​ | $ | (2,076) | ​ | $ | 592
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income | ​ |  | (65) | ​ |  | 492 | ​ |  | 427
Reclassification of amounts included in net income | ​ |  | (7) | ​ |  | — | ​ |  | (7)
Net other comprehensive income during period | ​ |  | (72) | ​ |  | 492 | ​ |  | 420
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending balance, September 30, 2020 | ​ | $ | 2,596 | ​ | $ | (1,584) | ​ | $ | 1,012
​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended September 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) | ​ |  | (707) | ​ |  | 1,116 | ​ |  | 409
Reclassification of amounts included in net income | ​ |  | (33) | ​ |  | — | ​ |  | (33)
Net other comprehensive income (loss) during period | ​ |  | (740) | ​ |  | 1,116 | ​ |  | 376
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending balance, September 30, 2021 | ​ | $ | 2,228 | ​ | $ | 331 | ​ | $ | 2,559
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended September 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) | ​ |  | 2,201 | ​ |  | (1,361) | ​ |  | 840
Reclassification of amounts included in net income | ​ |  | 4 | ​ |  | — | ​ |  | 4
Net other comprehensive income (loss) during period | ​ |  | 2,205 | ​ |  | (1,361) | ​ |  | 844
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending balance, September 30, 2020 | ​ | $ | 2,596 | ​ | $ | (1,584) | ​ | $ | 1,012

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