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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.

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