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Other comprehensive income (loss) (Tables) | 6 Months Ended
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Jun. 30, 2020
Other comprehensive income (loss) |
Schedule of components of accumulated other comprehensive loss | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | June 30, 2020 |  | ​ | December 31, 2019 |
Net unrealized gain on investment securities available-for-sale | ​ | $ | 11,291 | ​ | $ | 1,835 | ​
Income tax | ​ |  | 2,371 | ​ |  | 385 | ​
Net of income taxes | ​ |  | 8,920 | ​ |  | 1,450 | ​
Benefit plan adjustments | ​ |  | (6,579) | ​ |  | (6,579) | ​
Income tax | ​ |  | (1,382) | ​ |  | (1,382) | ​
Net of income taxes | ​ |  | (5,197) | ​ |  | (5,197) | ​
Derivative adjustments | ​ |  | 1,180 | ​ |  | 687 | ​
Income tax | ​ |  | 248 | ​ |  | 144 | ​
Net of income taxes | ​ |  | 932 | ​ |  | 543 | ​
Accumulated other comprehensive income (loss) | ​ | $ | 4,654 | ​ | $ | (3,205) | ​

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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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