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Investment Securities (Detail) (USD $)	3 Months Ended
Investment Securities (Detail) (USD $)	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Investment Securities Fair Market Value Pledged	$ 191,000,000		$ 123,700,000
OTTI Credit Portion	$ 268,000	$ 69,000
Impact Percentage Of Other Than Temporary Impairment Losses Investments Available For Sale Securities	7.00%

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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