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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2019
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 March 31, 2019 | ​ | $ | (107,779) | ​ | $ | 29,025 | ​ | $ | (78,754)
Three months ended June 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 | ​ | ​ | 64,841 | ​ | ​ | (17,462) | ​ | ​ | 47,379
Reclassification of net gains to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities gains, net | ​ | ​ | (21) | ​ | ​ | 6 | ​ | ​ | (15)
Net change in unrealized gains on investment securities | ​ | ​ | 64,820 | ​ | ​ | (17,456) | ​ | ​ | 47,364
Other comprehensive income | ​ | ​ | 64,007 | ​ | ​ | (17,237) | ​ | ​ | 46,770
Accumulated other comprehensive loss at June 30, 2019 | ​ | $ | (43,772) | ​ | $ | 11,788 | ​ | $ | (31,984)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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)
Six months ended June 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 | ​ | ​ | 135,364 | ​ | ​ | (36,453) | ​ | ​ | 98,911
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities losses, net | ​ | ​ | 2,592 | ​ | ​ | (698) | ​ | ​ | 1,894
Net change in unrealized gains on investment securities | ​ | ​ | 137,956 | ​ | ​ | (37,151) | ​ | ​ | 100,805
Other comprehensive income | ​ | ​ | 137,143 | ​ | ​ | (36,932) | ​ | ​ | 100,211
Accumulated other comprehensive loss at June 30, 2019 | ​ | $ | (43,772) | ​ | $ | 11,788 | ​ | $ | (31,984)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at March 31, 2018 | ​ | $ | (225,385) | ​ | $ | 60,701 | ​ | $ | (164,684)
Three months ended June 30, 2018 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (24,688) | ​ | ​ | 6,649 | ​ | ​ | (18,039)
Net change in unrealized losses on investment securities | ​ | ​ | (24,688) | ​ | ​ | 6,649 | ​ | ​ | (18,039)
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains on cash flow derivative hedges arising during the period | ​ | ​ | 425 | ​ | ​ | (112) | ​ | ​ | 313
Net change in unrealized gains on cash flow derivative hedges | ​ | ​ | 425 | ​ | ​ | (112) | ​ | ​ | 313
Other comprehensive loss | ​ | ​ | (24,263) | ​ | ​ | 6,537 | ​ | ​ | (17,726)
Accumulated other comprehensive loss at June 30, 2018 | ​ | $ | (249,648) | ​ | $ | 67,238 | ​ | $ | (182,410)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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)
Six months ended June 30, 2018 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Early adoption of ASU No. 2018-02 | ​ | ​ | — | ​ | ​ | (20,068) | ​ | ​ | (20,068)
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (91,388) | ​ | ​ | 24,572 | ​ | ​ | (66,816)
Net change in unrealized losses on investment securities | ​ | ​ | (91,388) | ​ | ​ | 24,572 | ​ | ​ | (66,816)
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains on cash flow derivative hedges arising during the period | ​ | ​ | 1,163 | ​ | ​ | (306) | ​ | ​ | 857
Net change in unrealized gains on cash flow derivative hedges | ​ | ​ | 1,163 | ​ | ​ | (306) | ​ | ​ | 857
Other comprehensive loss | ​ | ​ | (90,225) | ​ | ​ | 24,266 | ​ | ​ | (65,959)
Accumulated other comprehensive loss at June 30, 2018 | ​ | $ | (249,648) | ​ | $ | 67,238 | ​ | $ | (182,410)
Summary of changes in accumulated other comprehensive loss, net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Total
​ | ​ | Pensions | ​ | ​ | ​ | ​ | ​ | Accumulated
​ | ​ | and | ​ | ​ | ​ | ​ | ​ | Other
​ | ​ | Other | ​ | Investment | ​ | Cash Flow | ​ | Comprehensive
(dollars in thousands) |  | Benefits |  | Securities |  | Derivative Hedges |  | Loss
Three Months Ended June 30, 2019 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (28,379) | ​ | $ | (50,375) | ​ | $ | — | ​ | $ | (78,754)
Other comprehensive income | ​ | ​ | (594) | ​ | ​ | 47,364 | ​ | ​ | — | ​ | ​ | 46,770
Balance at end of period | ​ | $ | (28,973) | ​ | $ | (3,011) | ​ | $ | — | ​ | $ | (31,984)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Six Months Ended June 30, 2019 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (28,379) | ​ | $ | (103,816) | ​ | $ | — | ​ | $ | (132,195)
Other comprehensive income | ​ | ​ | (594) | ​ | ​ | 100,805 | ​ | ​ | — | ​ | ​ | 100,211
Balance at end of period | ​ | $ | (28,973) | ​ | $ | (3,011) | ​ | $ | — | ​ | $ | (31,984)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended June 30, 2018 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (31,339) | ​ | $ | (138,334) | ​ | $ | 4,989 | ​ | $ | (164,684)
Other comprehensive loss | ​ | ​ | — | ​ | ​ | (18,039) | ​ | ​ | 313 | ​ | ​ | (17,726)
Balance at end of period | ​ | $ | (31,339) | ​ | $ | (156,373) | ​ | $ | 5,302 | ​ | $ | (182,410)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Six Months Ended June 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 | ​ | ​ | — | ​ | ​ | (66,816) | ​ | ​ | 857 | ​ | ​ | (65,959)
Balance at end of period | ​ | $ | (31,339) | ​ | $ | (156,373) | ​ | $ | 5,302 | ​ | $ | (182,410)
​

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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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- 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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