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Fair Value (Qualitative information for assets and liabilities) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Servicing Assets [Member] | Cash Flow Valuation Technique [Member]  
Fair Value Inputs Assets Quantitative Information [Line Items]  
Fair Value assets and liabilities measured on reccurring basis $ 9,821
Valuation Technique Cash flow valuation
Servicing Assets [Member] | Cash Flow Valuation Technique [Member] | Minimum [Member]  
Fair Value Inputs Assets Quantitative Information [Line Items]  
Constant prepayment rate 3.94%
Discount rate 10.00%
Servicing Assets [Member] | Cash Flow Valuation Technique [Member] | Maximum [Member]  
Fair Value Inputs Assets Quantitative Information [Line Items]  
Constant prepayment rate 8.49%
Discount rate 12.00%
Collateral dependant impaired loan | Fair value of property or collateral [Member]  
Fair Value Inputs Assets Quantitative Information [Line Items]  
Fair Value assets and liabilities measured on reccurring basis $ 36,734
Valuation Technique Fair value of property or collateral
Collateral dependant impaired loan | Fair value of property or collateral [Member] | Minimum [Member]  
Fair Value Inputs Assets Quantitative Information [Line Items]  
Appraised Value 20.20%
Collateral dependant impaired loan | Fair value of property or collateral [Member] | Maximum [Member]  
Fair Value Inputs Assets Quantitative Information [Line Items]  
Appraised Value 36.20%
Other non-collateral dependant impaired loans [Member] | Cash Flow Valuation Technique [Member]  
Fair Value Inputs Assets Quantitative Information [Line Items]  
Fair Value assets and liabilities measured on reccurring basis $ 35,551
Valuation Technique Cash flow valuation
Other non-collateral dependant impaired loans [Member] | Cash Flow Valuation Technique [Member] | Minimum [Member]  
Fair Value Inputs Assets Quantitative Information [Line Items]  
Discount rate 4.15%
Other non-collateral dependant impaired loans [Member] | Cash Flow Valuation Technique [Member] | Maximum [Member]  
Fair Value Inputs Assets Quantitative Information [Line Items]  
Discount rate 10.50%
Foreclosed real estate [Member] | Fair value of property or collateral [Member]  
Fair Value Inputs Assets Quantitative Information [Line Items]  
Fair Value assets and liabilities measured on reccurring basis $ 44,174
Valuation Technique Fair value of property or collateral
Foreclosed real estate [Member] | Fair value of property or collateral [Member] | Minimum [Member]  
Fair Value Inputs Assets Quantitative Information [Line Items]  
Appraised Value 20.20%
Foreclosed real estate [Member] | Fair value of property or collateral [Member] | Maximum [Member]  
Fair Value Inputs Assets Quantitative Information [Line Items]  
Appraised Value 36.20%
Other repossessed assets [Member] | Fair value of property or collateral [Member]  
Fair Value Inputs Assets Quantitative Information [Line Items]  
Fair Value assets and liabilities measured on reccurring basis $ 3,548
Valuation Technique Fair value of property or collateral
Other repossessed assets [Member] | Fair value of property or collateral [Member] | Minimum [Member]  
Fair Value Inputs Assets Quantitative Information [Line Items]  
Estimated net realizable value 29.00%
Other repossessed assets [Member] | Fair value of property or collateral [Member] | Maximum [Member]  
Fair Value Inputs Assets Quantitative Information [Line Items]  
Estimated net realizable value 71.00%