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Investment Securities (Details Textual) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  | 6 Months Ended |  |  | 6 Months Ended
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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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