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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 2019
Accumulated Other Comprehensive Loss |
Schedule of changes in accumulated other comprehensive loss | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at June 30, 2019 | ​ | $ | (43,772) | ​ | $ | 11,788 | ​ | $ | (31,984)
Three months ended September 30, 2019 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the period | ​ | ​ | 18,079 | ​ | ​ | (4,869) | ​ | ​ | 13,210
Net change in investment securities | ​ | ​ | 18,079 | ​ | ​ | (4,869) | ​ | ​ | 13,210
Other comprehensive income | ​ | ​ | 18,079 | ​ | ​ | (4,869) | ​ | ​ | 13,210
Accumulated other comprehensive loss at September 30, 2019 | ​ | $ | (25,693) | ​ | $ | 6,919 | ​ | $ | (18,774)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at December 31, 2018 | ​ | $ | (180,915) | ​ | $ | 48,720 | ​ | $ | (132,195)
Nine months ended September 30, 2019 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Pension and other benefits: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net actuarial losses arising during the period | ​ | ​ | (813) | ​ | ​ | 219 | ​ | ​ | (594)
Net change in pension and other benefits | ​ | ​ | (813) | ​ | ​ | 219 | ​ | ​ | (594)
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the period | ​ | ​ | 153,443 | ​ | ​ | (41,322) | ​ | ​ | 112,121
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities losses, net | ​ | ​ | 2,592 | ​ | ​ | (698) | ​ | ​ | 1,894
Net change in investment securities | ​ | ​ | 156,035 | ​ | ​ | (42,020) | ​ | ​ | 114,015
Other comprehensive income | ​ | ​ | 155,222 | ​ | ​ | (41,801) | ​ | ​ | 113,421
Accumulated other comprehensive loss at September 30, 2019 | ​ | $ | (25,693) | ​ | $ | 6,919 | ​ | $ | (18,774)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at June 30, 2018 | ​ | $ | (249,648) | ​ | $ | 67,238 | ​ | $ | (182,410)
Three months ended September 30, 2018 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (30,682) | ​ | ​ | 8,262 | ​ | ​ | (22,420)
Net change in investment securities | ​ | ​ | (30,682) | ​ | ​ | 8,262 | ​ | ​ | (22,420)
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains on cash flow derivative hedges arising during the period | ​ | ​ | 178 | ​ | ​ | (47) | ​ | ​ | 131
Net change in cash flow derivative hedges | ​ | ​ | 178 | ​ | ​ | (47) | ​ | ​ | 131
Other comprehensive loss | ​ | ​ | (30,504) | ​ | ​ | 8,215 | ​ | ​ | (22,289)
Accumulated other comprehensive loss at September 30, 2018 | ​ | $ | (280,152) | ​ | $ | 75,453 | ​ | $ | (204,699)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at December 31, 2017 | ​ | $ | (159,423) | ​ | $ | 63,040 | ​ | $ | (96,383)
Nine months ended September 30, 2018 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Early adoption of ASU No. 2018-02 | ​ | ​ | — | ​ | ​ | (20,068) | ​ | ​ | (20,068)
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (122,070) | ​ | ​ | 32,834 | ​ | ​ | (89,236)
Net change in investment securities | ​ | ​ | (122,070) | ​ | ​ | 32,834 | ​ | ​ | (89,236)
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains on cash flow derivative hedges arising during the period | ​ | ​ | 1,341 | ​ | ​ | (353) | ​ | ​ | 988
Net change in cash flow derivative hedges | ​ | ​ | 1,341 | ​ | ​ | (353) | ​ | ​ | 988
Other comprehensive loss | ​ | ​ | (120,729) | ​ | ​ | 32,481 | ​ | ​ | (88,248)
Accumulated other comprehensive loss at September 30, 2018 | ​ | $ | (280,152) | ​ | $ | 75,453 | ​ | $ | (204,699)
Summary of changes in accumulated other comprehensive loss, net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pensions | ​ | ​ | ​ | ​ | ​ | Accumulated
​ | ​ | and | ​ | ​ | ​ | ​ | ​ | Other
​ | ​ | Other | ​ | Investment | ​ | Cash Flow | ​ | Comprehensive
(dollars in thousands) |  | Benefits |  | Securities |  | Derivative Hedges |  | Income (Loss)
Three Months Ended September 30, 2019 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (28,973) | ​ | $ | (3,011) | ​ | $ | — | ​ | $ | (31,984)
Other comprehensive income | ​ | ​ | — | ​ | ​ | 13,210 | ​ | ​ | — | ​ | ​ | 13,210
Balance at end of period | ​ | $ | (28,973) | ​ | $ | 10,199 | ​ | $ | — | ​ | $ | (18,774)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, 2019 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (28,379) | ​ | $ | (103,816) | ​ | $ | — | ​ | $ | (132,195)
Other comprehensive (loss) income | ​ | ​ | (594) | ​ | ​ | 114,015 | ​ | ​ | — | ​ | ​ | 113,421
Balance at end of period | ​ | $ | (28,973) | ​ | $ | 10,199 | ​ | $ | — | ​ | $ | (18,774)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended September 30, 2018 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (31,339) | ​ | $ | (156,373) | ​ | $ | 5,302 | ​ | $ | (182,410)
Other comprehensive loss | ​ | ​ | — | ​ | ​ | (22,420) | ​ | ​ | 131 | ​ | ​ | (22,289)
Balance at end of period | ​ | $ | (31,339) | ​ | $ | (178,793) | ​ | $ | 5,433 | ​ | $ | (204,699)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, 2018 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (25,946) | ​ | $ | (74,117) | ​ | $ | 3,680 | ​ | $ | (96,383)
Early adoption of ASU No. 2018-02 | ​ | ​ | (5,393) | ​ | ​ | (15,440) | ​ | ​ | 765 | ​ | ​ | (20,068)
Other comprehensive loss | ​ | ​ | — | ​ | ​ | (89,236) | ​ | ​ | 988 | ​ | ​ | (88,248)
Balance at end of period | ​ | $ | (31,339) | ​ | $ | (178,793) | ​ | $ | 5,433 | ​ | $ | (204,699)

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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=118930883&loc=d3e526-108580 + Details
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