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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss). |
Schedule of changes in accumulated other comprehensive income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at June 30, 2021 | ​ | $ | (40,509) | ​ | $ | 10,807 | ​ | $ | (29,702)
Three months ended September 30, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (43,316) | ​ | ​ | 11,555 | ​ | ​ | (31,761)
Net change in investment securities | ​ | ​ | (43,316) | ​ | ​ | 11,555 | ​ | ​ | (31,761)
Other comprehensive loss | ​ | ​ | (43,316) | ​ | ​ | 11,555 | ​ | ​ | (31,761)
Accumulated other comprehensive loss at September 30, 2021 | ​ | $ | (83,825) | ​ | $ | 22,362 | ​ | $ | (61,463)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive income at December 31, 2020 | ​ | $ | 43,098 | ​ | $ | (11,494) | ​ | $ | 31,604
Nine months ended September 30, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (126,821) | ​ | ​ | 33,829 | ​ | ​ | (92,992)
Reclassification of net gains to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities gains, net | ​ | ​ | (102) | ​ | ​ | 27 | ​ | ​ | (75)
Net change in investment securities | ​ | ​ | (126,923) | ​ | ​ | 33,856 | ​ | ​ | (93,067)
Other comprehensive loss | ​ | ​ | (126,923) | ​ | ​ | 33,856 | ​ | ​ | (93,067)
Accumulated other comprehensive loss at September 30, 2021 | ​ | $ | (83,825) | ​ | $ | 22,362 | ​ | $ | (61,463)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive income at June 30, 2020 | ​ | $ | 71,911 | ​ | $ | (19,180) | ​ | $ | 52,731
Three months ended September 30, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (1,991) | ​ | ​ | 532 | ​ | ​ | (1,459)
Reclassification of net gains to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities gains, net | ​ | ​ | (24) | ​ | ​ | 6 | ​ | ​ | (18)
Net change in investment securities | ​ | ​ | (2,015) | ​ | ​ | 538 | ​ | ​ | (1,477)
Other comprehensive loss | ​ | ​ | (2,015) | ​ | ​ | 538 | ​ | ​ | (1,477)
Accumulated other comprehensive income at September 30, 2020 | ​ | $ | 69,896 | ​ | $ | (18,642) | ​ | $ | 51,254
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at December 31, 2019 | ​ | $ | (43,450) | ​ | $ | 11,701 | ​ | $ | (31,749)
Nine months ended September 30, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Pension and other benefits: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Change in Company tax rate | ​ | ​ | — | ​ | ​ | (96) | ​ | ​ | (96)
Net change in pension and other benefits | ​ | ​ | — | ​ | ​ | (96) | ​ | ​ | (96)
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the period | ​ | ​ | 113,244 | ​ | ​ | (30,220) | ​ | ​ | 83,024
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities losses, net | ​ | ​ | 102 | ​ | ​ | (27) | ​ | ​ | 75
Net change in investment securities | ​ | ​ | 113,346 | ​ | ​ | (30,247) | ​ | ​ | 83,099
Other comprehensive income | ​ | ​ | 113,346 | ​ | ​ | (30,343) | ​ | ​ | 83,003
Accumulated other comprehensive income at September 30, 2020 | ​ | $ | 69,896 | ​ | $ | (18,642) | ​ | $ | 51,254
Summary of changes in accumulated other comprehensive income (loss), net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pensions | ​ | ​ | ​ | Accumulated
​ | ​ | and | ​ | ​ | ​ | Other
​ | ​ | Other | ​ | Investment | ​ | Comprehensive
(dollars in thousands) |  | Benefits |  | Securities |  | Income (Loss)
Three Months Ended September 30, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (31,737) | ​ | $ | 2,035 | ​ | $ | (29,702)
Other comprehensive loss | ​ | ​ | — | ​ | ​ | (31,761) | ​ | ​ | (31,761)
Balance at end of period | ​ | $ | (31,737) | ​ | $ | (29,726) | ​ | $ | (61,463)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (31,737) | ​ | $ | 63,341 | ​ | $ | 31,604
Other comprehensive loss | ​ | ​ | — | ​ | ​ | (93,067) | ​ | ​ | (93,067)
Balance at end of period | ​ | $ | (31,737) | ​ | $ | (29,726) | ​ | $ | (61,463)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended September 30, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (28,178) | ​ | $ | 80,909 | ​ | $ | 52,731
Other comprehensive loss | ​ | ​ | — | ​ | ​ | (1,477) | ​ | ​ | (1,477)
Balance at end of period | ​ | $ | (28,178) | ​ | $ | 79,432 | ​ | $ | 51,254
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (28,082) | ​ | $ | (3,667) | ​ | $ | (31,749)
Other comprehensive income | ​ | ​ | (96) | ​ | ​ | 83,099 | ​ | ​ | 83,003
Balance at end of period | ​ | $ | (28,178) | ​ | $ | 79,432 | ​ | $ | 51,254

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e526-108580 + Details
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