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Accumulated Other Comprehensive Loss | 6 Months Ended
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Jun. 30, 2019
Accumulated Other Comprehensive Loss | 10. Accumulated Other Comprehensive Loss ​ Accumulated other comprehensive loss is defined as the revenues, expenses, gains and losses that are included in comprehensive income but excluded from net income. The Company’s significant items of accumulated other comprehensive loss are pension and other benefits, net unrealized gains or losses on investment securities and net unrealized gains or losses on cash flow derivative hedges. ​ Changes in accumulated other comprehensive loss for the three and six months ended June 30, 2019 and 2018 are presented below: ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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)
​ The following table summarizes changes in accumulated other comprehensive loss, net of tax, for the periods indicated: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 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 The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration