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Acquired Credit Impaired Loans, Outstanding Balance and Carrying Value for Acquired Credit Impaired Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
May 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield $ 773 $ 633   $ 669 $ 813 $ 851 $ 1,080
Loans gross 1,162,325     849,060      
Loans, net 1,158,309     845,657      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]              
Outstanding balance 14,732     9,065      
Carrying amount 12,128     7,482      
Financial Asset Acquired with Credit Deterioration [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans, net 12,128     7,482      
Other [Member] | Financial Asset Acquired with Credit Deterioration [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans gross 379     402      
Residential real estate [Member] | Financial Asset Acquired with Credit Deterioration [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans gross 3,261     2,024      
Commercial, secured by real estate [Member] | Financial Asset Acquired with Credit Deterioration [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans gross 7,352     4,048      
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans gross 1,136     $ 1,008      
Columbus First Bancorp, Inc. [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition     $ 4,989        
Certain Loans Acquired in Transfer, Nonaccretable Difference     906        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition     4,083        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield     151        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value     $ 3,932        
Columbus First Bancorp, Inc. [Member] | Financial Asset Acquired with Credit Deterioration [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans, net 5,345            
Columbus First Bancorp, Inc. [Member] | Other [Member] | Financial Asset Acquired with Credit Deterioration [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans gross 0            
Columbus First Bancorp, Inc. [Member] | Residential real estate [Member] | Financial Asset Acquired with Credit Deterioration [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans gross 1,373            
Columbus First Bancorp, Inc. [Member] | Commercial, secured by real estate [Member] | Financial Asset Acquired with Credit Deterioration [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans gross 3,527            
Columbus First Bancorp, Inc. [Member] | Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans gross $ 445