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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.