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Fair Value Measurements - Qualitative Information for Level 3 Assets Measured at Fair Value on a Non-Recurring Basis (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Impaired loans $ 5,216 $ 5,697
Appraisals | Discount for costs to sell    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Impaired loans, input 0.070 0.070
Appraisals | Discount for quick sale    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Impaired loans, input   0.100
Appraisals | Discount for quick sale | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Impaired loans, input 0.10  
Appraisals | Discount for quick sale | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Impaired loans, input 0.15  
Discounted cash flows | Interest rates | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Impaired loans, input 0.0413 0.0413
Discounted cash flows | Interest rates | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Impaired loans, input 0.0625 0.0625