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Fair Market Value of Financial Assets and Liabilities, Quantitative Information about Level 3 Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Mortgage Servicing Rights [Member] | Minimum [Member] |
Fair Value Inputs [Abstract] |
Constant prepayment rate (in hundredths) | 8.50%
Probability of default (in hundredths) | 1.02%
Mortgage Servicing Rights [Member] | Maximum [Member] |
Fair Value Inputs [Abstract] |
Constant prepayment rate (in hundredths) | 25.00%
Probability of default (in hundredths) | 4.81%
Mortgage Servicing Rights [Member] | Weighted Average [Member] |
Fair Value Inputs [Abstract] |
Constant prepayment rate (in hundredths) | 16.30%
Probability of default (in hundredths) | 2.65%
Discount rate (in hundredths) | 10.50%
Mortgage Servicing Rights [Member] | Income Approach Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Assets, Fair Value Disclosure | 2,364
Impaired Loans (Collateral Dependent) [Member] | Minimum [Member] |
Fair Value Inputs [Abstract] |
Marketability discount (in hundredths) | 5.00%
Impaired Loans (Collateral Dependent) [Member] | Maximum [Member] |
Fair Value Inputs [Abstract] |
Marketability discount (in hundredths) | 10.00%
Impaired Loans (Collateral Dependent) [Member] | Weighted Average [Member] |
Fair Value Inputs [Abstract] |
Marketability discount (in hundredths) | 7.00%
Impaired Loans (Collateral Dependent) [Member] | Market Approach Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Assets, Fair Value Disclosure | 5,465
Other Real Estate/Asset Owned [Member] | Minimum [Member] |
Fair Value Inputs [Abstract] |
Comparability adjustments (in hundredths) | 5.00%
Other Real Estate/Asset Owned [Member] | Maximum [Member] |
Fair Value Inputs [Abstract] |
Comparability adjustments (in hundredths) | 35.00%
Other Real Estate/Asset Owned [Member] | Weighted Average [Member] |
Fair Value Inputs [Abstract] |
Comparability adjustments (in hundredths) | 13.00%
Other Real Estate/Asset Owned [Member] | Market Approach Valuation Technique [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Assets, Fair Value Disclosure | 13,892

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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
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueInputsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of adjustment to the observed price for a similar asset or liability when an identical transaction does not exist, 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
Name: | us-gaap_FairValueInputsComparabilityAdjustments
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Adjustment to the discount rate used to measure fair value for lack of ability to convert business interests into cash quickly. + 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
Name: | us-gaap_FairValueInputsDiscountForLackOfMarketability
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_FairValueInputsPrepaymentRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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