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Other comprehensive income (loss) (Tables) | 3 Months Ended
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Mar. 31, 2023
Other comprehensive income (loss) |
Schedule of components of accumulated other comprehensive loss | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | ​ | March 31, 2023 |  | ​ | December 31, 2022 |
Net unrealized loss on investment securities available-for-sale | ​ | $ | (55,495) | ​ | $ | (66,250) | ​
Income tax benefit | ​ |  | (11,950) | ​ |  | (14,266) | ​
Net of income taxes | ​ |  | (43,545) | ​ |  | (51,984) | ​
Benefit plan adjustments | ​ |  | (5,499) | ​ |  | (5,499) | ​
Income tax benefit | ​ |  | (1,184) | ​ |  | (1,184) | ​
Net of income taxes | ​ |  | (4,315) | ​ |  | (4,315) | ​
Derivative adjustments | ​ |  | (2,017) | ​ |  | (47) | ​
Income tax benefit | ​ |  | (434) | ​ |  | (10) | ​
Net of income taxes | ​ |  | (1,583) | ​ |  | (37) | ​
Accumulated other comprehensive loss | ​ | $ | (49,442) | ​ | $ | (56,336) | ​
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI https://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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