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Loans and Allowance for Loan Losses (Purchased Credit Impaired Loans) (Details) - Purchased Credit Impaired Loans [Member] - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Certain Loans Acquired In Transfer Not Accounted $ 48,404 $ 43,577
Less remaining purchase discount (14,246) (10,783)
Total, gross 34,158 32,794
Less: Allowance for loan losses 0 (16)
Carrying amount, net of allowance 34,158 32,778
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 24,849 23,366
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 11,108 10,764
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 5,731 6,285
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 5,824 1,452
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 $ 892 $ 1,710