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Acquired Credit Impaired Loans, Major Classifications of Acquired Credit Impaired Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans gross $ 856,657 $ 849,060
Less allowance for loan losses 3,529 3,403
Loans, net 853,128 845,657
Acquired credit impaired loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans gross 6,620 7,482
Less allowance for loan losses 0 0
Loans, net 6,620 7,482
Acquired credit impaired loans [Member] | Commercial and industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans gross 258 1,008
Acquired credit impaired loans [Member] | Commercial, secured by real estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans gross 3,989 4,048
Acquired credit impaired loans [Member] | Residential real estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans gross 1,961 2,024
Acquired credit impaired loans [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans gross 0 0
Acquired credit impaired loans [Member] | Agricultural [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans gross 0 0
Acquired credit impaired loans [Member] | Other loans, including deposit overdrafts [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans gross $ 412 $ 402