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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
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Collateral dependent impaired loans [1] $ 7,747   $ 7,079
Nonrecurring [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Collateral dependent impaired loans 4,725   3,828
Property acquired through foreclosure or repossession 1,081   605
Nonrecurring [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Collateral dependent impaired loans 4,725   3,828
Property acquired through foreclosure or repossession $ 1,081   $ 605
Nonrecurring [Member] | Minimum [Member] | Collateral Dependent Impaired Loans [Member] | Appraisals Of Collateral [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Discount for costs to sell 0.00% 10.00%  
Appraisal adjustments [2] 0.00% 0.00%  
Nonrecurring [Member] | Minimum [Member] | Loan Servicing Rights [Member] | Discounted Cash Flow [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Discount rates    
Prepayment rates    
Nonrecurring [Member] | Minimum [Member] | Property Acquired Through Foreclosure Or Repossession [Member] | Appraisals Of Collateral [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Discount for costs to sell 10.00% 10.00%  
Appraisal adjustments [2] 0.00% 6.00%  
Nonrecurring [Member] | Maximum [Member] | Collateral Dependent Impaired Loans [Member] | Appraisals Of Collateral [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Discount for costs to sell 25.00% 20.00%  
Appraisal adjustments [2] 15.00% 10.00%  
Nonrecurring [Member] | Maximum [Member] | Loan Servicing Rights [Member] | Discounted Cash Flow [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Discount rates    
Prepayment rates    
Nonrecurring [Member] | Maximum [Member] | Property Acquired Through Foreclosure Or Repossession [Member] | Appraisals Of Collateral [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Discount for costs to sell 29.00% 12.00%  
Appraisal adjustments [2] 32.00% 50.00%  
Nonrecurring [Member] | Weighted Average [Member] | Collateral Dependent Impaired Loans [Member] | Appraisals Of Collateral [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Discount for costs to sell 13.00% 15.00%  
Appraisal adjustments [2] 8.00% 9.00%  
Nonrecurring [Member] | Weighted Average [Member] | Loan Servicing Rights [Member] | Discounted Cash Flow [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Discount rates    
Prepayment rates    
Nonrecurring [Member] | Weighted Average [Member] | Property Acquired Through Foreclosure Or Repossession [Member] | Appraisals Of Collateral [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Discount for costs to sell 12.00% 11.00%  
Appraisal adjustments [2] 16.00% 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 impaired accruing loans (troubled debt restructurings for which management has concluded that the collectibility of the loan is not in doubt), the recorded investment also includes accrued interest.
[2] Management may adjust appraisal values to reflect market value declines or other discounts resulting from its knowledge of the property.