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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements of Comprehensive Income
Net unrealized holding gains (losses) on securities available for sale arising during period, tax effects	$ 35,960	$ (11,300)	$ 29,863
Reclassification adjustment for gains on securities available for sale included in net income, tax effects	(6,050)	(11,623)	(4,185)
Reclassification adjustment for impairment charges on available for sale securities included in net income, tax effects	$ 342	$ 2,946	$ 0

X

- Definition

Tax effect on the reclassification adjustment for gains or losses realized upon the sale of securities during the period.

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-Name Statement of Financial Accounting Standard (FAS)

-Number 130

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Tax effect on the reclassification adjustment for losses realized upon the write-down of securities.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 25

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Name Statement of Financial Accounting Standard (FAS)

-Number 130

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e640-108580



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