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Participation In The U.S. Treasury Capital Purchase Program (CPP) (Details) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2012 | Dec. 31, 2011 | Dec. 23, 2008
Participation In The U.S. Treasury Capital Repurchase Program [Line Items] |  |  |
Cumulative perpetual preferred stock issued, value | $ 98,372,000 | $ 98,146,000 | $ 100,000,000
Liquidation preference per senior preferred shares |  |  | $ 1,000
Charge to retained earnings representing preferred stock dividend and accretion of discount | $ 1,500,000 |  |
Warrant issued to U.S. Treasury relating to CPP | 227,376 |  |
Issued warrants as a percentage of senior preferred shares purchased | 15.00% |  |
Warrant issued to U.S. treasury relating to CPP, exercise price | $ 65.97 |  |
Term of warrants | 10 years |  |
Revised Cumulative Dividends Rate [Member] |  |  |
Participation In The U.S. Treasury Capital Repurchase Program [Line Items] |  |  |
Preferred stock, dividend rate, percentage | 9.00% |  |
Cumulative Dividends Rate [Member] |  |  |
Participation In The U.S. Treasury Capital Repurchase Program [Line Items] |  |  |
Preferred stock, dividend rate, percentage | 5.00% |  |

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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph d -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4, 6 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 + Details
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