Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components of accumulated other comprehensive loss, net of related tax benefit/expense
Net unrealized gains (losses) on investment securities — available-for-sale, net of related tax expense (benefit) of $(113) at December 31, 2014, ($1,335) at December 31, 2013 and $2,301 at December 31, 2012	$ (210)	$ (2,480)	$ 4,274
Pension and other postretirement benefits adjustment, net of related tax benefit of $17,362 at December 31, 2014, $9,714 at December 31, 2013 and $19,058 at December 31, 2012	(32,243)	(18,040)	(35,393)
Accumulated other comprehensive loss	$ (32,453)	$ (20,520)	$ (31,119)

The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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