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Fair Value Measurements (Qualitative Information About Level 3 Assets Measured at Fair Value on a Nonrecurring Basis) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value Inputs Assets Qualitative Information [Line Items]    
Collateral dependent impaired loans [1] $ 5,993 $ 7,079
Nonrecurring [Member]    
Fair Value Inputs Assets Qualitative Information [Line Items]    
Collateral dependent impaired loans 1,425 3,828
Property acquired through foreclosure or repossession 131 605
Nonrecurring [Member] | Level 3 [Member]    
Fair Value Inputs Assets Qualitative Information [Line Items]    
Collateral dependent impaired loans 1,425 3,828
Property acquired through foreclosure or repossession $ 131 $ 605
Nonrecurring [Member] | Level 3 [Member] | Appraisals Of Collateral [Member] | Collateral Dependent Impaired Loans [Member] | Minimum [Member]    
Fair Value Inputs Assets Qualitative Information [Line Items]    
Discount for costs to sell 0.00% 10.00%
Appraisal adjustments   0.00%
Nonrecurring [Member] | Level 3 [Member] | Appraisals Of Collateral [Member] | Collateral Dependent Impaired Loans [Member] | Maximum [Member]    
Fair Value Inputs Assets Qualitative Information [Line Items]    
Discount for costs to sell 15.00% 20.00%
Appraisal adjustments   10.00%
Nonrecurring [Member] | Level 3 [Member] | Appraisals Of Collateral [Member] | Collateral Dependent Impaired Loans [Member] | Weighted Average [Member]    
Fair Value Inputs Assets Qualitative Information [Line Items]    
Discount for costs to sell 15.00% 15.00%
Appraisal adjustments   9.00%
Nonrecurring [Member] | Level 3 [Member] | Appraisals Of Collateral [Member] | Property Acquired Through Foreclosure Or Repossession [Member] | Minimum [Member]    
Fair Value Inputs Assets Qualitative Information [Line Items]    
Discount for costs to sell 10.00% 10.00%
Appraisal adjustments 12.00% 6.00%
Nonrecurring [Member] | Level 3 [Member] | Appraisals Of Collateral [Member] | Property Acquired Through Foreclosure Or Repossession [Member] | Maximum [Member]    
Fair Value Inputs Assets Qualitative Information [Line Items]    
Discount for costs to sell 10.00% 12.00%
Appraisal adjustments 17.00% 50.00%
Nonrecurring [Member] | Level 3 [Member] | Appraisals Of Collateral [Member] | Property Acquired Through Foreclosure Or Repossession [Member] | Weighted Average [Member]    
Fair Value Inputs Assets Qualitative Information [Line Items]    
Discount for costs to sell 10.00% 11.00%
Appraisal adjustments 15.00% 24.00%
[1] The recorded investment in impaired loans consists of unpaid principal balance, net of charge-offs, interest payments received applied to principal and unamortized deferred loan origination fees and costs. For accruing impaired loans (troubled debt restructurings for which management has concluded that the collectability of the loan is not in doubt), the recorded investment also includes accrued interest.