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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) | 12 Months Ended
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Dec. 31, 2012
Consolidated Statements of Changes in Stockholders' Equity |
Preferred dividends declared and accrued, per preferred share (as a percent) | 5.00%us-gaap_PreferredStockDividendRatePercentage

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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementOfStockholdersEquityAbstract
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration