Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Statement of Income and Comprehensive Income [Abstract]
Net income	$ 6,001	$ 5,751
Available-for-sale securities:
Unrealized gains on securities available-for-sale with other-than-temporary impairment	209	943
Unrealized gain on securities available-for-sale without other-than-temporary impairment	495	6,092
Less: reclassification adjustment for gains realized in net income	(51)	(1,836)
Less: reclassification adjustment for credit related other-than-temporary impairments recognized in net income		527
Unrealized gains on available-for-sale securities in OCI	653	5,726
Defined benefit plans:
Less: reclassification adjustment for amortization in net prior service cost	43
Unrealized gains on benefit plans	43
Derivative securities:
Unrealized gains on derivative securities		30
Other comprehensive income (loss), before tax	696	5,756
Income tax expense related to items of other comprehensive income	(263)	(2,144)
Other comprehensive income, net of tax	433	3,612
Comprehensive income, net of tax	$ 6,434	$ 9,363

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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Tax effect of the change in accumulated other comprehensive income (loss), that is, the tax effect on items included in other comprehensive income (loss) during the period.

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Pre tax reclassification adjustment for gains or losses realized upon the sale of securities.

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