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Disclosures about fair value of assets and liabilities (Details 5) (Level 3 [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Impaired Loans [Member] |  |
Qualitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill |  |
Fair Value | $ 8,109 | $ 8,652
Valuation Technique | Collateral based measurement | Collateral based measurement
Unobservable Inputs | Discount to reflect current market conditions and ultimate collectability | Discount to reflect current market conditions and ultimate collectability
Mortgage Servicing Rights [Member] |  |
Qualitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill |  |
Fair Value | $ 5,461 | $ 5,145
Valuation Technique | Discounted cashflows | Discounted cashflows
Unobservable Inputs | Discount rate, Constant prepayment rate, Probably of default | Discount rate, Constant prepayment rate, Probably of default
Maximum [Member] | Impaired Loans [Member] |  |
Qualitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill |  |
Discount to reflect current market conditions and ultimate collectability | 15.00% | 15.00%
Maximum [Member] | Mortgage Servicing Rights [Member] |  |
Qualitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill |  |
Discount rate | 15.00% | 15.00%
Constant prepayment rate | 7.00% | 7.00%
Probably of default | 10.00% | 10.00%
Minimum [Member] | Impaired Loans [Member] |  |
Qualitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill |  |
Discount to reflect current market conditions and ultimate collectability | 10.00% | 10.00%
Minimum [Member] | Mortgage Servicing Rights [Member] |  |
Qualitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill |  |
Discount rate | 10.00% | 10.00%
Constant prepayment rate | 4.00% | 4.00%
Probably of default | 1.00% | 1.00%
Weighted Average [Member] | Impaired Loans [Member] |  |
Qualitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill |  |
Discount to reflect current market conditions and ultimate collectability | 12.00% | 12.00%
Weighted Average [Member] | Mortgage Servicing Rights [Member] |  |
Qualitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill |  |
Discount rate | 12.00% | 12.00%
Constant prepayment rate | 4.60% | 4.60%
Probably of default | 4.50% | 4.50%

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- Definition Discount to reflect current market conditions and ultimate collectability. + References No definition available. + Details
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- Definition Fair value measurement with unobservable inputs recurring and nonrecurring basis excluding goodwill. + References No definition available. + Details
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- Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + 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 (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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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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- 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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- Definition Description of the inputs and valuation technique(s) used 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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