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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, 2017
Dec. 31, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Total loans $ 28,651 $ 35,619
Less remaining purchase discount (6,645) (8,426)
Total loans, net of purchase discount 22,006 27,193
Less: Allowance for loan losses 0 0
Carrying amount, net of allowance 22,006 27,193
Commercial Real Estate [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Total loans 16,036 18,473
Consumer Real Estate [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Total loans 8,955 12,111
Construction and Land Development [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Total loans 1,920 2,553
Commercial and Industrial [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Total loans 1,740 2,482
Consumer and Other [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Total loans $ 0 $ 0