v3.8.0.1
Loans - Carrying Amount of Purchased Credit Impaired Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]    
Total impaired loans $ 5,395 $ 4,570
Unaccreted discount on purchased credit impaired loans (1,638) (1,197)
Receivables Acquired with Deteriorated Credit Quality    
Accounts Notes And Loans Receivable [Line Items]    
Total 3,757 3,373
Commercial Real Estate | Receivables Acquired with Deteriorated Credit Quality    
Accounts Notes And Loans Receivable [Line Items]    
Total 1,079 177
Commercial and Industrial Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total impaired loans 2,774 4,258
Commercial and Industrial Loans | Receivables Acquired with Deteriorated Credit Quality    
Accounts Notes And Loans Receivable [Line Items]    
Total 1,841 3,196
Consumer Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total impaired loans   17
Land | Receivables Acquired with Deteriorated Credit Quality    
Accounts Notes And Loans Receivable [Line Items]    
Total 837  
Real Estate Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total impaired loans 2,621 295
Real Estate Loans | Commercial Real Estate    
Accounts Notes And Loans Receivable [Line Items]    
Total impaired loans 1,525 $ 295
Real Estate Loans | Land    
Accounts Notes And Loans Receivable [Line Items]    
Total impaired loans $ 1,096