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Reclassifications Out of the Company's AOCI (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Amount Reclassified from AOCI, before tax $ (117) $ (51)
Amount Reclassified from AOCI, total net of tax 73  
Amount Reclassified related to amortization of prior service costs 81 65
Amount Reclassified from AOCI, Defined benefit pension plan items, Total Before Tax (313) 43
Amount Reclassified from AOCI, Defined benefit pension plan items, Total net of tax 197  
Total Reclassifications 124  
Available-for-sale Securities
    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Amount Reclassified from AOCI, before tax 117  
Amount Reclassified from AOCI, Income Tax (benefit) expense 44  
Amount Reclassified from AOCI, total net of tax 73  
Available-for-sale Securities | Unrealized Gain (Loss or Write-down)
    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Amount Reclassified from AOCI, before tax 117  
Defined Benefit Pension Plans [Member]
    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Amount Reclassified from AOCI, Defined benefit pension plan items, Total Before Tax 81  
Amount Reclassified from AOCI, Defined benefit pension plan items, Income Tax (benefit) expense 30  
Amount Reclassified from AOCI, Defined benefit pension plan items, Total net of tax 51  
Defined Benefit Pension Plans [Member] | Net Periodic Pension Cost
    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Amount Reclassified related to amortization of prior service costs 69 [1]  
Amount Reclassified related to amortization of net losses 12 [1]  
Amount Reclassified related to net actuarial losses    [1]  
[1] These items are included in the computation of net periodic pension cost. See Note 8, "Defined Benefit Plans," for additional information.