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Other comprehensive income (loss) (Tables) | 6 Months Ended
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Jun. 30, 2023
Equity [Abstract] |
Summary of Accumulated Other Comprehensive Income (Loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended June 30, 2023
​ |  | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | Accumulated
​ | ​ | Securities | ​ | Securities | ​ | Fair Value | ​ | ​ | ​ | Other
​ | ​ | Available-for- | ​ | Transferred to | ​ | Municipal | ​ | Cash Flow | ​ | Comprehensive
​ |  | Sale |  | Held-to-Maturity |  | Security Hedges |  | Hedges |  | Income (Loss)
Beginning balance, March 31, 2023 |  | $ | (27,478) | ​ | $ | (712) | ​ | $ | — | ​ | $ | (430) | ​ | $ | (28,620)
​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income (loss) | ​ |  | (5,654) | ​ | ​ | — | ​ |  | — | ​ | ​ | (771) | ​ |  | (6,425)
Reclassification of amounts included in net income | ​ |  | — | ​ | ​ | 28 | ​ |  | — | ​ | ​ | — | ​ |  | 28
Net other comprehensive income (loss) during period | ​ |  | (5,654) | ​ | ​ | 28 | ​ |  | — | ​ |  | (771) | ​ |  | (6,397)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending balance, June 30, 2023 | ​ | $ | (33,132) | ​ | $ | (684) | ​ | $ | — | ​ | $ | (1,201) | ​ | $ | (35,017)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended June 30, 2022
​ |  | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | Accumulated
​ | ​ | Securities | ​ | Securities | ​ | Fair Value | ​ | ​ | ​ | Other
​ | ​ | Available-for- | ​ | Transferred to | ​ | Municipal | ​ | Cash Flow | ​ | Comprehensive
​ |  | Sale |  | Held-to-Maturity |  | Security Hedges |  | Hedges |  | Income (Loss)
Beginning balance, March 31, 2022 | ​ | $ | (15,067) | ​ | $ | (833) | ​ | $ | 344 | ​ | $ | — | ​ | $ | (15,556)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income (loss) | ​ |  | (8,459) | ​ | ​ | — | ​ |  | (662) | ​ | ​ | — | ​ |  | (9,121)
Reclassification of amounts included in net income | ​ |  | — | ​ | ​ | 29 | ​ |  | — | ​ | ​ | — | ​ |  | 29
Net other comprehensive income (loss) during period | ​ |  | (8,459) | ​ | ​ | 29 | ​ |  | (662) | ​ |  | — | ​ |  | (9,092)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending balance, June 30, 2022 | ​ | $ | (23,526) | ​ | $ | (804) | ​ | $ | (318) | ​ | $ | — | ​ | $ | (24,648)
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended June 30, 2023
​ |  | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | Accumulated
​ | ​ | Securities | ​ | Securities | ​ | Fair Value | ​ | ​ | ​ | Other
​ | ​ | Available-for- | ​ | Transferred to | ​ | Municipal | ​ | Cash Flow | ​ | Comprehensive
​ |  | Sale |  | Held-to-Maturity |  | Security Hedges |  | Hedges |  | Income (Loss)
Beginning balance, December 31, 2022 |  | $ | (33,616) | ​ | $ | (742) | ​ | $ | — | ​ | $ | (966) | ​ | $ | (35,324)
​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income (loss) | ​ |  | 484 | ​ | ​ | — | ​ |  | — | ​ | ​ | (235) | ​ |  | 249
Reclassification of amounts included in net income | ​ |  | — | ​ | ​ | 58 | ​ |  | — | ​ | ​ | — | ​ |  | 58
Net other comprehensive income (loss) during period | ​ |  | 484 | ​ | ​ | 58 | ​ |  | — | ​ |  | (235) | ​ |  | 307
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending balance, June 30, 2023 | ​ | $ | (33,132) | ​ | $ | (684) | ​ | $ | — | ​ | $ | (1,201) | ​ | $ | (35,017)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended June 30, 2022
​ |  | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | Accumulated
​ | ​ | Securities | ​ | Securities | ​ | Fair Value | ​ | ​ | ​ | Other
​ | ​ | Available-for- | ​ | Transferred to | ​ | Municipal | ​ | Cash Flow | ​ | Comprehensive
​ |  | Sale |  | Held-to-Maturity |  | Security Hedges |  | Hedges |  | Income (Loss)
Beginning balance, December 31, 2021 | ​ | $ | 25 | ​ | $ | 665 | ​ | $ | 753 | ​ | $ | — | ​ | $ | 1,443
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income (loss) | ​ |  | (23,551) | ​ | ​ | (1,490) | ​ |  | (1,071) | ​ | ​ | — | ​ |  | (26,112)
Reclassification of amounts included in net income | ​ |  | — | ​ | ​ | 21 | ​ |  | — | ​ | ​ | — | ​ |  | 21
Net other comprehensive income (loss) during period | ​ |  | (23,551) | ​ | ​ | (1,469) | ​ |  | (1,071) | ​ |  | — | ​ |  | (26,091)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending balance, June 30, 2022 | ​ | $ | (23,526) | ​ | $ | (804) | ​ | $ | (318) | ​ | $ | — | ​ | $ | (24,648)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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