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Fair Value Measurements (Additional Qualitative Information about Level 3 Assets) (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
loan
Dec. 31, 2016
USD ($)
loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Number of impaired loans requiring a valuation allowance | loan 6  
Impaired Financing Receivable, Recorded Investment $ 1,405 $ 2,624
Impaired Financing Receivable, Related Allowance 0 $ 0
Number of impaired loans not requiring a valuation allowance | loan   7
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 1,405 $ 2,624
Impaired Loans, Cumulative Charge-Offs 886 831
Impaired Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring $ 1,405 $ 2,624
Fair Value Inputs, Discount Rate   0.00%
Fair Value Inputs, Probability of Default 0.00%  
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 $ 279 $ 1,473
Fair Value Measurements, Valuation Techniques [1] Appraisal of collateral  
Fair Value Disclosure, Unobservable Input Range [2] Appraisal adjustments  
Fair Value Inputs, Discount Rate 10.00% 10.00%
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 $ 1,126 $ 1,151
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] | 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 4.00% 4.00%
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 5.25% 5.25%
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 10.00% 10.00%
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 5.11% 5.11%
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 $ 4,243 $ 5,302
Fair Value Measurements, Valuation Techniques [1] Appraisal of collateral  
Fair Value Disclosure, Unobservable Input Range [2] Liquidation Expenses  
Fair Value Inputs, Discount Rate 0.00% 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.