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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2018
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 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)
|  |  |  |  | Income |  |  |
|  |  |  |  | Tax |  |  |
|  | Pre-tax |  | Benefit |  | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at March 31, 2017 |  | $ | (143,296) |  | $ | 56,604 |  | $ | (86,692)
Three months ended June 30, 2017 |  |  |  |  |  |  |  |  |
Investment securities: |  |  |  |  |  |  |  |  |
Unrealized net gains arising during the period |  |  | 31,215 |  |  | (12,330) |  |  | 18,885
Net change in unrealized gains on investment securities |  |  | 31,215 |  |  | (12,330) |  |  | 18,885
Cash flow derivative hedges: |  |  |  |  |  |  |  |  |
Unrealized net gains on cash flow derivative hedges arising during the period |  |  | 258 |  |  | (102) |  |  | 156
Net change in unrealized gains on cash flow derivative hedges |  |  | 258 |  |  | (102) |  |  | 156
Other comprehensive income |  |  | 31,473 |  |  | (12,432) |  |  | 19,041
Accumulated other comprehensive loss at June 30, 2017 |  | $ | (111,823) |  | $ | 44,172 |  | $ | (67,651)
|  |  |  |  | Income |  |  |
|  |  |  |  | Tax |  |  |
|  | Pre-tax |  | Benefit |  | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at December 31, 2016 |  | $ | (145,472) |  | $ | 57,461 |  | $ | (88,011)
Six months ended June 30, 2017 |  |  |  |  |  |  |  |  |
Investment securities: |  |  |  |  |  |  |  |  |
Unrealized net gains arising during the period |  |  | 32,793 |  |  | (12,951) |  |  | 19,842
Net change in unrealized gains on investment securities |  |  | 32,793 |  |  | (12,951) |  |  | 19,842
Cash flow derivative hedges: |  |  |  |  |  |  |  |  |
Unrealized net gains on cash flow derivative hedges arising during the period |  |  | 856 |  |  | (338) |  |  | 518
Net change in unrealized gains on cash flow derivative hedges |  |  | 856 |  |  | (338) |  |  | 518
Other comprehensive income |  |  | 33,649 |  |  | (13,289) |  |  | 20,360
Accumulated other comprehensive loss at June 30, 2017 |  | $ | (111,823) |  | $ | 44,172 |  | $ | (67,651)
Summary of changes in accumulated other comprehensive loss, net of tax |
|  |  |  |  |  |  |  |  |  | Total
|  | Pensions |  | Unrealized |  | Unrealized |  | Accumulated
|  | and |  | (Losses) Gains |  | Gains on |  | Other
|  | Other |  | on Investment |  | Cash Flow |  | Comprehensive
(dollars in thousands) |  | Benefits |  | Securities |  | Derivative Hedges |  | Loss
Three Months Ended June 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (31,339) |  | $ | (138,334) |  | $ | 4,989 |  | $ | (164,684)
Other comprehensive (loss) income |  |  | — |  |  | (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) income |  |  | — |  |  | (66,816) |  |  | 857 |  |  | (65,959)
Balance at end of period |  | $ | (31,339) |  | $ | (156,373) |  | $ | 5,302 |  | $ | (182,410)
Three Months Ended June 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (30,237) |  | $ | (59,001) |  | $ | 2,546 |  | $ | (86,692)
Other comprehensive income |  |  | — |  |  | 18,885 |  |  | 156 |  |  | 19,041
Balance at end of period |  | $ | (30,237) |  | $ | (40,116) |  | $ | 2,702 |  | $ | (67,651)
Six Months Ended June 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (30,237) |  | $ | (59,958) |  | $ | 2,184 |  | $ | (88,011)
Other comprehensive income |  |  | — |  |  | 19,842 |  |  | 518 |  |  | 20,360
Balance at end of period |  | $ | (30,237) |  | $ | (40,116) |  | $ | 2,702 |  | $ | (67,651)

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e526-108580 + Details
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