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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Summary of activity in accumulated other comprehensive income (loss) | The following tables summarize the components of accumulated other comprehensive income (loss) at June 30, 2018 and 2017 respectively, including changes during the preceding six and three month periods as well as any reclassifications out of accumulated other comprehensive income (loss).
($ in Thousands) | Investment Securities Available For Sale |  | Defined Benefit Pension and Post Retirement Obligations |  | Accumulated Other Comprehensive Income (Loss)
Balance January 1, 2018 | $ | (38,453 | ) |  | $ | (24,305 | ) |  | $ | (62,758 | )
Other comprehensive income (loss) before reclassifications | (60,754 | ) |  | — |  |  | (60,754 | )
Amounts reclassified from accumulated other comprehensive income (loss) |  |  |  |  |  |
Investment securities losses (gains), net | 2,015 |  |  | — |  |  | 2,015 |
Personnel expense | — |  |  | (76 | ) |  | (76 | )
Other expense | — |  |  | 929 |  |  | 929 |
Adjustment for adoption of ASU 2016-01 | (84 | ) |  | — |  |  | (84 | )
Adjustment for adoption of ASU 2018-02 | (8,419 | ) |  | (5,235 | ) |  | (13,654 | )
Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities) | (632 | ) |  | — |  |  | (632 | )
Income tax (expense) benefit | 15,340 |  |  | (216 | ) |  | 15,124 |
Net other comprehensive income (loss) during period | (52,533 | ) |  | (4,597 | ) |  | (57,130 | )
Balance June 30, 2018 | $ | (90,986 | ) |  | $ | (28,902 | ) |  | $ | (119,888 | )
Balance January 1, 2017 | $ | (20,079 | ) |  | $ | (34,600 | ) |  | $ | (54,679 | )
Other comprehensive income (loss) before reclassifications | 3,632 |  |  | — |  |  | 3,632 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  |  |  |  |
Personnel expense | — |  |  | (75 | ) |  | (75 | )
Other expense | — |  |  | 975 |  |  | 975 |
Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities) | (2,575 | ) |  | — |  |  | (2,575 | )
Income tax (expense) benefit | (406 | ) |  | (342 | ) |  | (748 | )
Net other comprehensive income (loss) during period | 651 |  |  | 558 |  |  | 1,209 |
Balance June 30, 2017 | $ | (19,428 | ) |  | $ | (34,042 | ) |  | $ | (53,470 | )
| Investments Securities Available For Sale |  | Defined Benefit Pension and Post Retirement Obligations |  | Accumulated Other Comprehensive Income (Loss)
Balance April 1, 2018 | $ | (78,453 | ) |  | $ | (29,220 | ) |  | $ | (107,673 | )
Other comprehensive income (loss) before reclassifications | (18,919 | ) |  | — |  |  | (18,919 | )
Amounts reclassified from accumulated other comprehensive income (loss) |  |  |  |  |
Investment securities losses (gains), net | 2,015 |  |  | — |  |  | 2,015 |
Personnel expense | — |  |  | (38 | ) |  | (38 | )
Other expense | — |  |  | 465 |  |  | 465 |
Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities) | (335 | ) |  | — |  |  | (335 | )
Income tax (expense) benefit | 4,705 |  |  | (109 | ) |  | 4,596 |
Net other comprehensive income (loss) during period | (12,533 | ) |  | 318 |  |  | (12,215 | )
Balance June 30, 2018 | $ | (90,986 | ) |  | $ | (28,902 | ) |  | $ | (119,888 | )
Balance April 1, 2017 | $ | (22,023 | ) |  | $ | (34,321 | ) |  | $ | (56,344 | )
Other comprehensive income (loss) before reclassifications | 5,744 |  |  | — |  |  | 5,744 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  |  |  |
Personnel expense | — |  |  | (37 | ) |  | (37 | )
Other expense | — |  |  | 487 |  |  | 487 |
Interest income (Amortization of net unrealized losses (gains)on available for sale securities transferred to held to maturity securities) | (1,548 | ) |  | — |  |  | (1,548 | )
Income tax (expense) benefit | (1,601 | ) |  | (171 | ) |  | (1,772 | )
Net other comprehensive income (loss) during period | 2,595 |  |  | 279 |  |  | 2,874 |
Balance June 30, 2017 | $ | (19,428 | ) |  | $ | (34,042 | ) |  | $ | (53,470 | )

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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=114867106&loc=SL7669686-108580 + Details
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