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Fair Value Measurements and Fair Value of Financial Instruments (Additional Qualitative Information about Level 3 Assets) (Details) (Significant Unobservable Inputs (Level 3) [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Impaired Loans [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | $ 11,084 |  |  |
Fair Value Measurements, Valuation Techniques | Appraisal of collateral |  | Appraisal of collateral | [1]
Impaired Loans [Member] | Minimum [Member] | Unobservable Inputs Appraisal Adjustments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Disclosure, Unbservable Input Range | 0.00% | [2] |  |
Impaired Loans [Member] | Maximum [Member] | Unobservable Inputs Appraisal Adjustments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Disclosure, Unbservable Input Range | 30.00% | [2] | 30.00% | [2]
Impaired Loans [Member] | Weighted Average [Member] | Unobservable Inputs Appraisal Adjustments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Disclosure, Unbservable Input Range | 24.07% | [2] | 24.10% | [2]
Foreclosed Real Estate Owned [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring | $ 1,099 |  |  |
Fair Value Measurements, Valuation Techniques | Appraisal of collateral |  | Appraisal of collateral | [1],[3]
Foreclosed Real Estate Owned [Member] | Unobservable Inputs - Liquidation Expenses [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Disclosure, Unbservable Input Range | 20.00% |  | 20.00% |
[1] | 1) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various level 3 inputs which are not identifiable, less any associated allowance.
[2] | (2) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range and weighted average of liquidation expenses and other
[3] | (3) Includes qualitative adjustments by management and estimated liquidation expenses.

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- Definition Fair Value Disclosure, Unbservable Input Range + References No definition available. + 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 on a nonrecurring basis 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 No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- 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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