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Other comprehensive income (loss) (Tables) | 9 Months Ended
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Sep. 30, 2023
Equity [Abstract] |
Summary of Accumulated Other Comprehensive Income (Loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended September 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, June 30, 2023 |  | $ | (33,132) | ​ | $ | (684) | ​ | $ | — | ​ | $ | (1,201) | ​ | $ | (35,017)
​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income (loss) | ​ |  | (4,325) | ​ | ​ | — | ​ |  | — | ​ | ​ | 115 | ​ |  | (4,210)
Reclassification of amounts included in net income | ​ |  | 5,044 | ​ | ​ | 27 | ​ |  | — | ​ | ​ | — | ​ |  | 5,071
Net other comprehensive income (loss) during period | ​ |  | 719 | ​ | ​ | 27 | ​ |  | — | ​ |  | 115 | ​ |  | 861
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending balance, September 30, 2023 | ​ | $ | (32,413) | ​ | $ | (657) | ​ | $ | — | ​ | $ | (1,086) | ​ | $ | (34,156)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended September 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, June 30, 2022 | ​ | $ | (23,526) | ​ | $ | (804) | ​ | $ | (318) | ​ | $ | — | ​ | $ | (24,648)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income (loss) | ​ |  | (14,942) | ​ | ​ | — | ​ |  | 69 | ​ | ​ | (1,317) | ​ |  | (16,190)
Reclassification of amounts included in net income | ​ |  | — | ​ | ​ | 31 | ​ |  | — | ​ | ​ | — | ​ |  | 31
Net other comprehensive income (loss) during period | ​ |  | (14,942) | ​ | ​ | 31 | ​ |  | 69 | ​ |  | (1,317) | ​ |  | (16,159)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending balance, September 30, 2022 | ​ | $ | (38,468) | ​ | $ | (773) | ​ | $ | (249) | ​ | $ | (1,317) | ​ | $ | (40,807)
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended September 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) | ​ |  | (3,841) | ​ | ​ | — | ​ |  | — | ​ | ​ | (120) | ​ |  | (3,961)
Reclassification of amounts included in net income | ​ |  | 5,044 | ​ | ​ | 85 | ​ |  | — | ​ | ​ | — | ​ |  | 5,129
Net other comprehensive income (loss) during period | ​ |  | 1,203 | ​ | ​ | 85 | ​ |  | — | ​ |  | (120) | ​ |  | 1,168
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending balance, September 30, 2023 | ​ | $ | (32,413) | ​ | $ | (657) | ​ | $ | — | ​ | $ | (1,086) | ​ | $ | (34,156)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended September 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) | ​ |  | (38,493) | ​ | ​ | (1,490) | ​ |  | (1,002) | ​ | ​ | (1,317) | ​ |  | (42,302)
Reclassification of amounts included in net income | ​ |  | — | ​ | ​ | 52 | ​ |  | — | ​ | ​ | — | ​ |  | 52
Net other comprehensive income (loss) during period | ​ |  | (38,493) | ​ | ​ | (1,438) | ​ |  | (1,002) | ​ |  | (1,317) | ​ |  | (42,250)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending balance, September 30, 2022 | ​ | $ | (38,468) | ​ | $ | (773) | ​ | $ | (249) | ​ | $ | (1,317) | ​ | $ | (40,807)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​

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