Related Tax Effects Allocated to Other Comprehensive Income and Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Transactions Pre-tax
Unrealized gain on securities available-for-sale			$ 4,680	$ 5,226
Unrealized loss on derivatives			628	(1,949)
Unfunded pension obligation			850	850
Foreign currency translation			309	(83)
Total			6,467	4,044
Transactions Tax-effect
Unrealized gain on securities available-for-sale			(1,767)	(2,073)
Unrealized loss on derivatives			(237)	711
Deferred tax (liabilities) assets	(160)	(158)	(321)	(26)
Foreign currency translation			0	0
Total			(2,325)	(1,388)
Transactions Net of tax
Unrealized gain on securities available-for-sale			2,913	3,153
Unrealized loss on derivatives			391	(1,238)
Unfunded pension obligation	265	267	529	824
Foreign currency translation			309	(83)
Total			4,142	2,656
Balances Net of tax
Unrealized gain on securities available-for-sale	11,977	13,377	11,977	13,377
Unrealized loss on derivatives	0	(307)	0	(307)
Unfunded pension obligation	(20,753)	(20,937)	(20,753)	(20,937)
Foreign currency translation	874	36	874	36
Total	$ (7,902)	$ (7,831)	$ (7,902)	$ (7,831)	$ (12,044)

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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The increase (decrease) in accumulated comprehensive income during the period related to pension and other postretirement benefit plans, after tax. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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