Comprehensive Income (Changes In Accumulated Other Comprehensive Income, Net Of Tax, By Component) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Accumulated Other Comprehensive Income Loss [Abstract]
Unrealized Net Gains on Securities Available for Sale, Beginning balance	$ 9,269
Unrealized Net Gains on Securities Available for Sale, Other comprehensive income before reclassifications	(511)
Unrealized Net Gains on Securities Available for Sale, Amounts reclassified from accumulated other comprehensive income	(445)	(70)
Unrealized Net Gains on Securities Available for Sale, Net current period other comprehensive Income	(956)
Unrealized Net Gains on Securities Available for Sale, Ending balance	8,313
Non-Credit Related Loss on Debt Securities not Expected to be Sold, Beginning balance	(8,039)
Non-Credit Related Loss on Debt Securities not Expected to be Sold, Other comprehensive income before reclassifications	327
Non-Credit Related Loss on Debt Securities not Expected to be Sold, Amounts reclassified from accumulated other comprehensive income
Non-Credit Related Loss on Debt Securities not Expected to be Sold, Net current period other comprehensive Income	327
Non-Credit Related Loss on Debt Securities not Expected to be Sold, Ending balance	(7,712)
Unrealized Losses on Derivative Instruments, Beginning balance	(171)
Unrealized Losses on Derivative Instruments, Other comprehensive income before reclassifications	(694)
Unrealized Losses on Derivative Instruments, Amounts reclassified from accumulated other comprehensive income
Unrealized Losses on Derivative Instruments, Net current period other comprehensive Income	(694)
Unrealized Losses on Derivative Instruments, Ending balance	(865)
Unrecognized Pension and Postretirement Obligations, Beginning balance	(47,283)
Unrecognized Pension and Postretirement Obligations, Other comprehensive income before reclassifications	349
Unrecognized Pension and Postretirement Obligations, Amounts reclassified from accumulated other comprehensive income
Unrecognized Pension and Postretirement Obligations, Net current period other comprehensive Income	349
Unrecognized Pension and Postretirement Obligations, Ending balance	(46,934)
Total, Beginning balance	(46,224)
Total, Other comprehensive income before reclassifications	(529)
Total, Amounts reclassified from accumulated other comprehensive income	(445)
Total, Net current period other comprehensive Income	(974)
Total, Ending balance	$ (47,198)

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Other Comprehensive Income Loss Before Reclassification Adjustment Portion Attributable To Parent Net Of Tax

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Other Comprehensive Income Loss Derivative Instrument Before Reclassification Adjustments Net Of Tax

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Other Comprehensive Income Loss Non Credit Loss On Debt Securities Before Reclassification Adjustments Net Of Tax

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Other Comprehensive Income Loss Pension and Postretirement Obligations Amounts Reclassified from Accumulated Other Comprehensive Income

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Other Comprehensive Income Loss Reclassified Amount On Non Credit Related Loss On Debt Securities Net Of Tax

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Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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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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Total of accumulated other comprehensive loss related to that portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized either as available-for-sale or held-to-maturity that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

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Net of tax and reclassification adjustments amount of the increase (decrease) in accumulated other comprehensive income (loss) related to pension and other postretirement benefit plans, attributable to the parent entity.

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Net of tax and reclassification adjustments amount of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges, which is attributable to the parent entity. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Net of tax amount of unrealized holding gain (loss) before reclassification adjustments on available-for-sale securities.

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Net of tax amount of the appreciation (loss) in the value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) losses.

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Net of tax amount of the income statement impact of the reclassification adjustment for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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