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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
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Collateral dependent impaired loans [1] $ 9,187 $ 17,138
Nonrecurring [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Collateral dependent impaired loans 5,726 10,545
Loan servicing rights 3,314  
Property acquired through foreclosure or repossession 575 270
Nonrecurring [Member] | Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Collateral dependent impaired loans 5,726 10,545
Loan servicing rights 3,314  
Property acquired through foreclosure or repossession $ 575 $ 270
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% 0.00%
Appraisal adjustments [2]
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 10.00%  
Prepayment rates 13.00%  
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% 12.00%
Appraisal adjustments [2] 6.00% 32.00%
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 20.00% 20.00%
Appraisal adjustments [2] 15.00%  
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 14.00%  
Prepayment rates 24.00%  
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 10.00% 12.00%
Appraisal adjustments [2] 15.00% 32.00%
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 10.00% 2.00%
Appraisal adjustments [2] 14.00%  
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 11.00%  
Prepayment rates 16.00%  
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 10.00% 12.00%
Appraisal adjustments [2] 13.00% 32.00%
[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.