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Investment Securities (Details Textual) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended		6 Months Ended			6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2009	Dec. 31, 2011	Jun. 30, 2012 CMO's / REMIC's - Residential [Member]	Feb. 29, 2008 CMO's / REMIC's - Residential [Member]	Dec. 31, 2006 CMO's / REMIC's - Residential [Member] Security Score	Jun. 30, 2012 Municipal Bonds [Member]
Investments Securities (Textual) [Abstract]
Securities issued by US Government percentage	71.00%		71.00%
Gross realized gain			$ 0	$ 0
Gross realized losses			0	0
CMO/REMIC's backed by whole loans issued by private-label companies (non-government sponsored)							3,400,000
Investment security classified as held-to-maturity, number									1
Held-to-maturity securities, average FICO score									715
Held-to-maturity securities, acquired price, percentage								98.25%
Fair value percentage of held-to-maturity security against par value							58.00%
Average percentage of LTV									71.00%
Average life of investment grade debt securities, years							3 years 6 months			9 years 9 months 18 days
Investment contractual cash flows guaranteed by Government, percentage							99.79%
Investment contractual cash flows guaranteed by banks, percentage							0.21%
Gross Unrealized Holding Losses							0
Loss on securities greater than 12 months										0
Investment securities pledged as collateral	2,100,000,000		2,100,000,000			1,850,000,000
Contractual maturity, years							30 years
Impairment loss							0
Impairment loss on investment securities					2,000,000
Non Credit Portion reflected in other comprehensive income					1,700,000
Remaining loss recognized in earnings					323,000
Credit-related impairment loss on investment securities held-to-maturity	0	119,000	0	119,000
Net impairment losses	2,200,000		2,200,000			1,900,000
Other than temporary impairment loss				$ 119,000

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Average life of investment grade debt securities.

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Average percentage of LTV.

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Contractual maturity of securities.

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Fair value percentage of held-to-maturity security against par value.

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Held to maturity assets fico score average.

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Held-to-maturity securities, acquired price percentage.

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Investment contractual cash flows guaranteed by banks.

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Investment contractual cash flows guaranteed by government.

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Investment securities pledged as collateral.

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Investment security classified as held to maturity number.

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Other than temporary impairment loss.

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Remaining loss recognized in earnings.

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Securities backed by whole loans.

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Securities issued by US Government percentage.

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Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as held-to-maturity that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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Before tax amount of other than temporary impairment (OTTI) on a debt security, categorized as either available-for-sale or held-to-maturity, recognized in other comprehensive income (loss), attributable to the parent entity.

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Before tax amount of other than temporary impairment (OTTI) on a debt security, categorized as available-for-sale, recognized in other comprehensive income (loss), attributable to the parent entity.

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