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Fair Value Measurements (Details 2) (Level 3 [Member], Mortgage servicing rights [Member]) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Level 3 [Member] | Mortgage servicing rights [Member] |  |
Quantitative Information about Level 3 Fair Value Measurements |  |
Weighted average constant prepayment rate | 18.60% | 20.86%
Weighted average discount rate | 7.99% | 7.99%

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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + 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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