Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (Loss)) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive (loss) income, Before Tax	$ 6,193	$ 6,556
Total other comprehensive (loss) income, Tax Effect	(2,487)us-gaap_OtherComprehensiveIncomeLossTax	(2,678)us-gaap_OtherComprehensiveIncomeLossTax
Total other comprehensive income	3,706	3,878
Unrealized gains and losses on securities available for sale:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (losses) gains, Before Tax	6,202	6,287
Reclassification adjustment, Before Tax	(2)	350
Total other comprehensive (loss) income, Before Tax	6,200	6,637
Net (losses) gains, Tax Effect	(2,491)	(2,568)
Reclassification adjustment, Tax Effect	(1)	143
Total other comprehensive (loss) income, Tax Effect	(2,490)	(2,711)
Net (losses) gains, After Tax	3,711	3,719
Reclassification adjustment, After Tax	(1)	207
Total other comprehensive income	3,710	3,926
Amortization related to post-retirement obligations
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive (loss) income, Before Tax	(7)	(81)
Total other comprehensive (loss) income, Tax Effect	3	33
Total other comprehensive income	$ (4)	$ (48)

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Amount before tax, after reclassification adjustments of other comprehensive income (loss).

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