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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 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 March 31, 2021 | ​ | $ | (59,238) | ​ | $ | 15,803 | ​ | $ | (43,435)
Three months ended June 30, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the period | ​ | ​ | 18,831 | ​ | ​ | (5,023) | ​ | ​ | 13,808
Reclassification of net gains to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities gains, net | ​ | ​ | (102) | ​ | ​ | 27 | ​ | ​ | (75)
Net change in investment securities | ​ | ​ | 18,729 | ​ | ​ | (4,996) | ​ | ​ | 13,733
Other comprehensive income | ​ | ​ | 18,729 | ​ | ​ | (4,996) | ​ | ​ | 13,733
Accumulated other comprehensive loss at June 30, 2021 | ​ | $ | (40,509) | ​ | $ | 10,807 | ​ | $ | (29,702)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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
Six months ended June 30, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (83,505) | ​ | ​ | 22,274 | ​ | ​ | (61,231)
Reclassification of net gains to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities gains, net | ​ | ​ | (102) | ​ | ​ | 27 | ​ | ​ | (75)
Net change in investment securities | ​ | ​ | (83,607) | ​ | ​ | 22,301 | ​ | ​ | (61,306)
Other comprehensive loss | ​ | ​ | (83,607) | ​ | ​ | 22,301 | ​ | ​ | (61,306)
Accumulated other comprehensive loss at June 30, 2021 | ​ | $ | (40,509) | ​ | $ | 10,807 | ​ | $ | (29,702)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive income at March 31, 2020 | ​ | $ | 5,629 | ​ | $ | (1,500) | ​ | $ | 4,129
Three months ended June 30, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the period | ​ | ​ | 66,071 | ​ | ​ | (17,624) | ​ | ​ | 48,447
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities losses, net | ​ | ​ | 211 | ​ | ​ | (56) | ​ | ​ | 155
Net change in investment securities | ​ | ​ | 66,282 | ​ | ​ | (17,680) | ​ | ​ | 48,602
Other comprehensive income | ​ | ​ | 66,282 | ​ | ​ | (17,680) | ​ | ​ | 48,602
Accumulated other comprehensive income at June 30, 2020 | ​ | $ | 71,911 | ​ | $ | (19,180) | ​ | $ | 52,731
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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)
Six months ended June 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 | ​ | ​ | 115,235 | ​ | ​ | (30,751) | ​ | ​ | 84,484
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities losses, net | ​ | ​ | 126 | ​ | ​ | (34) | ​ | ​ | 92
Net change in investment securities | ​ | ​ | 115,361 | ​ | ​ | (30,785) | ​ | ​ | 84,576
Other comprehensive income | ​ | ​ | 115,361 | ​ | ​ | (30,881) | ​ | ​ | 84,480
Accumulated other comprehensive income at June 30, 2020 | ​ | $ | 71,911 | ​ | $ | (19,180) | ​ | $ | 52,731
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 June 30, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (31,737) | ​ | $ | (11,698) | ​ | $ | (43,435)
Other comprehensive income | ​ | ​ | — | ​ | ​ | 13,733 | ​ | ​ | 13,733
Balance at end of period | ​ | $ | (31,737) | ​ | $ | 2,035 | ​ | $ | (29,702)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Six Months Ended June 30, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (31,737) | ​ | $ | 63,341 | ​ | $ | 31,604
Other comprehensive loss | ​ | ​ | — | ​ | ​ | (61,306) | ​ | ​ | (61,306)
Balance at end of period | ​ | $ | (31,737) | ​ | $ | 2,035 | ​ | $ | (29,702)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended June 30, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (28,178) | ​ | $ | 32,307 | ​ | $ | 4,129
Other comprehensive income | ​ | ​ | — | ​ | ​ | 48,602 | ​ | ​ | 48,602
Balance at end of period | ​ | $ | (28,178) | ​ | $ | 80,909 | ​ | $ | 52,731
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Six Months Ended June 30, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (28,082) | ​ | $ | (3,667) | ​ | $ | (31,749)
Other comprehensive income | ​ | ​ | (96) | ​ | ​ | 84,576 | ​ | ​ | 84,480
Balance at end of period | ​ | $ | (28,178) | ​ | $ | 80,909 | ​ | $ | 52,731

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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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