v3.8.0.1
Loans - Carrying Amount of Purchased Credit Impaired Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]    
Total impaired loans $ 4,803 $ 5,395
Unaccreted discount on purchased credit impaired loans (1,448) (1,638)
Receivables Acquired with Deteriorated Credit Quality    
Accounts Notes And Loans Receivable [Line Items]    
Total 3,355 3,757
Commercial Real Estate | Receivables Acquired with Deteriorated Credit Quality    
Accounts Notes And Loans Receivable [Line Items]    
Total 695 1,079
Commercial and Industrial Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total impaired loans 2,716 2,774
Commercial and Industrial Loans | Receivables Acquired with Deteriorated Credit Quality    
Accounts Notes And Loans Receivable [Line Items]    
Total 1,832 1,841
Land | Receivables Acquired with Deteriorated Credit Quality    
Accounts Notes And Loans Receivable [Line Items]    
Total 828 837
Real Estate Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total impaired loans 2,087 2,621
Real Estate Loans | Commercial Real Estate    
Accounts Notes And Loans Receivable [Line Items]    
Total impaired loans 976 1,525
Real Estate Loans | Land    
Accounts Notes And Loans Receivable [Line Items]    
Total impaired loans $ 1,111 $ 1,096