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Fair Value Measurements and Fair Value of Financial Instruments (Additional Qualitative Information about Level 3 Assets) (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) loan | Sep. 30, 2014 loan | Dec. 31, 2014 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | $ 10,440 |  | $ 11,605
Number of impaired loans requiring a valuation allowance | loan |  | 1 | 3 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  | $ 1,648 |  | 2,973
Impaired Financing Receivable, Related Allowance |  | $ 389 |  | 293
Number of impaired loans not requiring a valuation allowance | loan |  | 16 | 14 |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  | $ 8,792 |  | 8,632
Impaired Loans, Cumulative Charge-Offs |  | 1,742 |  | 1,022
Impaired Loans [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  | 10,051 |  | 11,312
Impaired Loans [Member] | Appraisal of collateral [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  | $ 9,625 |  | $ 11,312
Fair Value Measurements, Valuation Techniques | [1] | Appraisal of collateral(1) |  | Appraisal of collateral(1)
Fair Value Disclosure, Unobservable Input Range | [2] | Appraisal adjustments(2) |  | Appraisal adjustments(2)
Impaired Loans [Member] | Present value of future cash flows [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  | $ 426 |  |
Fair Value Measurements, Valuation Techniques |  | Present value of future cash flows |  |
Fair Value Disclosure, Unobservable Input Range |  | Loan discount rate |  |
Impaired Loans [Member] | Minimum [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Inputs, Discount Rate |  |  |  | 6.00%
Impaired Loans [Member] | Minimum [Member] | Appraisal of collateral [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Inputs, Discount Rate |  | 10.00% |  |
Impaired Loans [Member] | Minimum [Member] | Present value of future cash flows [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Inputs, Discount Rate |  | 5.75% |  |
Impaired Loans [Member] | Maximum [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Inputs, Discount Rate |  |  |  | 33.00%
Impaired Loans [Member] | Maximum [Member] | Appraisal of collateral [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Inputs, Discount Rate |  | 25.00% |  |
Impaired Loans [Member] | Maximum [Member] | Present value of future cash flows [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Inputs, Discount Rate |  | 6.75% |  |
Impaired Loans [Member] | Weighted Average [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Inputs, Discount Rate |  |  |  | 23.35%
Impaired Loans [Member] | Weighted Average [Member] | Appraisal of collateral [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Inputs, Discount Rate |  | 17.36% |  |
Impaired Loans [Member] | Weighted Average [Member] | Present value of future cash flows [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Inputs, Discount Rate |  | 6.25% |  |
Foreclosed Real Estate Owned [Member] | Appraisal of collateral [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure, Nonrecurring |  | $ 1,345 |  | $ 3,726
Fair Value Measurements, Valuation Techniques | [1] | Appraisal of collateral(1) |  | Appraisal of collateral(1)
Fair Value Disclosure, Unobservable Input Range | [2] | Liquidation Expenses(2) |  | Liquidation Expenses(2)
Foreclosed Real Estate Owned [Member] | Weighted Average [Member] | Appraisal of collateral [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Inputs, Discount Rate |  | 10.00% |  | 10.00%
[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] | 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 appraisal adjustments are presented as a percent of the appraisal.

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- Definition Cumulative amount of charge-offs against impaired financing receivables over their respective lives. + References No definition available. + Details
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- Definition The number of impaired loans during the period for which a valuation allowance was not required due to the estimated realizable value of the collateral exceeding the recorded investment in the loans. + References No definition available. + 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=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524 + Details
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