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Other Comprehensive Income - Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	$ (1,143)us-gaap_IncomeTaxExpenseBenefit	$ (899)us-gaap_IncomeTaxExpenseBenefit
Net income available to common shareholders	2,767	2,057
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income available to common shareholders	(46)	(25)
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains and losses on available-for-sale securities		4
Income tax expense		(1)
Net income available to common shareholders		3
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Defined Benefit Pension Items [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Actuarial gains/(losses)	(70)	(43)
Income tax expense	24	15
Net income available to common shareholders	$ (46)	$ (28)

- Definition

Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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