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Fair Value Measurements Quantitative Information about Level 3 Nonrecurring Assets (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Loans Receivable, Fair Value Disclosure $ 1,778 [1] $ 3,074 [2]
Other Real Estate Owned, Fair Value Disclosure [3]   1,690
Fair Value, Inputs, Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Loans Receivable, Fair Value Disclosure $ 1,778 [1] 3,074 [2]
Other Real Estate Owned, Fair Value Disclosure [3]   $ 1,690
Loans Receivable [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount Rate 0.00% 5.00%
Fair Value Inputs, Comparability Adjustments 0.00% 0.00%
Loans Receivable [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount Rate 7.00% 7.00%
Fair Value Inputs, Comparability Adjustments 20.00% 20.00%
Loans Receivable [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount Rate 5.00% 6.00%
Fair Value Inputs, Comparability Adjustments 14.00% 13.00%
Other Assets [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount Rate   0.00%
Fair Value Inputs, Comparability Adjustments   0.00%
Other Assets [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount Rate   6.00%
Fair Value Inputs, Comparability Adjustments   18.00%
Other Assets [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount Rate   6.00%
Fair Value Inputs, Comparability Adjustments   18.00%
Substandard [Member] | Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Loans Receivable, Fair Value Disclosure $ 1,778 $ 3,074
Other Real Estate Owned, Fair Value Disclosure   $ 1,690
[1] Collateral-dependent impaired loans held as of December 31, 2017 that had write-downs in fair value or whose specific reserve changed during 2017.
[2] Collateral-dependent impaired loans held as of December 31, 2016 that had write-downs in fair value or whose specific reserve changed during 2016
[3] OREO held as of December 31, 2016 that had write-downs in fair value during 2016.