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Regulatory Capital Details 2 (Details)
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12 Months Ended |
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Dec. 31, 2012
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| Banking and Thrift [Abstract] | |
| Description of Regulatory Requirements, Capital Adequacy Purposes | Quantitative measures established by each regulatory agency to ensure capital adequacy require the reporting institutions to maintain a minimum total risk-based capital ratio of 8%, a minimum Tier 1 risk-based capital ratio of 4% and a minimum leverage ratio of 3% for the most highly rated banks that do not expect significant growth. All other institutions are required to maintain a minimum leverage ratio of 4%. |