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Loans and Allowance for Loan Losses - Purchased Credit Impaired Loans (Details) - Purchased Credit Impaired Loans [Member] - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Total loans $ 42,407 $ 43,577
Less remaining purchase discount (13,259) (10,783)
Total loans, net of purchase discount 29,148 32,794
Less: Allowance for loan losses (19) (16)
Carrying amount, net of allowance 29,129 32,778
Commercial Real Estate [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Total loans 24,790 23,366
Consumer Real Estate [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Total loans 8,401 10,764
Construction and Land Development [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Total loans 5,473 6,285
Commercial and Industrial [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Total loans 2,851 1,452
Consumer and Other [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Total loans $ 892 $ 1,710