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Loans and Allowance for Loan Losses (Details 8) - Purchased Credit Impaired Loans [Member] - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Certain Loans Acquired In Transfer Not Accounted $ 43,577 $ 35,619
Less remaining purchase discount (10,783) (8,426)
Certain Loans Acquired In Transfer 32,794 27,193
Less: Allowance for loan losses (16) 0
Carrying amount, net of allowance 32,778 27,193
Commercial Real Estate [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Certain Loans Acquired In Transfer Not Accounted 23,366 18,473
Consumer Real Estate [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Certain Loans Acquired In Transfer Not Accounted 10,764 12,111
Construction and Land Development [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Certain Loans Acquired In Transfer Not Accounted 6,285 2,553
Commercial and Industrial [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Certain Loans Acquired In Transfer Not Accounted 1,452 2,482
Consumer and Other [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Certain Loans Acquired In Transfer Not Accounted $ 1,710 $ 0