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Securities (Details 3) (Mortgage-backed securities) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Lower Range |  |
Prepayment rate | 0.50% | 9.00%
Loss severity | 26.17% | 2.00%
Cumulative default rate | 0.00% | 0.51%
Principal write-down | 0.00% | 0.00%
Upper Range |  |
Prepayment rate | 74.40% | 58.00%
Loss severity | 75.55% | 140.00%
Cumulative default rate | 35.07% | 9.16%
Principal write-down | 2.68% | 0.81%

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- Definition Loss, including interest and principal, incurred on a write-down of a security, expressed as a percentage of the original principal balance, used as an input to measure fair value. + References No definition available. + Details
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- Definition Loss, including interest and principal, incurred on a defaulted security, expressed as a percentage of the original principal balance, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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