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Fair Market Value of Financial Assets and Liabilities, Quantitative Information about Level 3 Fair Value Measurements (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Mortgage servicing rights $ 3,815 $ 3,484
Impaired loans (collateral dependent) 556 2,709
Other real estate owned $ 7,640 $ 18,951
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Constant Prepayment Rate [Member] | Minimum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Mortgage servicing rights, measurement input 0.070 0.070
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Constant Prepayment Rate [Member] | Maximum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Mortgage servicing rights, measurement input 0.280 0.450
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Constant Prepayment Rate [Member] | Weighted Average [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Mortgage servicing rights, measurement input 0.083 0.100
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Probability of Default [Member] | Minimum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Mortgage servicing rights, measurement input 0.000 0.000
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Probability of Default [Member] | Maximum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Mortgage servicing rights, measurement input 1.000 1.000
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Probability of Default [Member] | Weighted Average [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Mortgage servicing rights, measurement input 0.025 0.030
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Discount Rate [Member] | Minimum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Mortgage servicing rights, measurement input 0.100 0.100
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Discount Rate [Member] | Maximum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Mortgage servicing rights, measurement input 0.115 0.115
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Discount Rate [Member] | Weighted Average [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Mortgage servicing rights, measurement input 0.101 0.101
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Marketability Discount [Member] | Minimum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Impaired loans (collateral dependent), measurement input 0.100 0.019
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Marketability Discount [Member] | Maximum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Impaired loans (collateral dependent), measurement input 1.000 0.898
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Marketability Discount [Member] | Weighted Average [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Impaired loans (collateral dependent), measurement input 0.441 0.385
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Comparability Adjustment [Member] | Minimum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Other real estate owned, measurement input 0.060 0.060
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Comparability Adjustment [Member] | Maximum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Other real estate owned, measurement input 0.320 0.586
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Comparability Adjustment [Member] | Weighted Average [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Other real estate owned, measurement input 0.157 0.150