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Fair Value Measurements (Textual) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans held for sale on nonaccrual status $ 0 $ 0  
Impairment of goodwill 0 0  
Impairment identified for intangible assets 0 0  
Loans held for sale 90 days past due and on accrual status 0 0  
Nonrecurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Liabilities recorded at fair value $ 0 0  
Non-compete intangible assets      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Finite-lived intangible assets amortization period 1 year    
Loan Servicing Rights      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Valuation allowance related to impairment   $ 8,000 $ 0
Minimum      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Discount factors used to determine fair value 20.00%    
Finite-lived intangible assets amortization period 10 years    
Minimum | Other Real Estate and Repossessed Assets      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Discount factors used to determine fair value 20.00%    
Maximum      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Discount factors used to determine fair value 30.00%    
Finite-lived intangible assets amortization period 15 years    
Maximum | Other Real Estate and Repossessed Assets      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Discount factors used to determine fair value 30.00%