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Loans and Allowance for Loan Losses, Impaired Loans and TDR's (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Impaired Loans [Abstract]    
Unpaid principal balance $ 10,821 $ 4,660
Recorded investment with no allowance 10,077 3,435
Recorded investment with an allowance 506 1,021
Total recorded investment 10,583 4,456
Related allowance 46 396
Average recorded investment 8,912 7,640
Interest income recognized 795 342
Troubled Debt Restructurings [Abstract]    
Troubled debt restructurings post modification recorded investment 0 0
Troubled debt restructurings modified in the past twelve months that subsequently defaulted recorded investment 0  
Construction & Development [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance 0 0
Recorded investment with no allowance 0 0
Recorded investment with an allowance 0 0
Total recorded investment 0 0
Related allowance 0 0
Average recorded investment 0 8
Interest income recognized 0 0
1 - 4 Family Real Estate [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance 115 0
Recorded investment with no allowance 115 111
Recorded investment with an allowance 0 0
Total recorded investment 115 111
Related allowance 0 0
Average recorded investment 82 111
Interest income recognized 4 0
Commercial Real Estate - Other [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance 1,990 787
Recorded investment with no allowance 1,506 0
Recorded investment with an allowance 484 675
Total recorded investment 1,990 675
Related allowance 32 300
Average recorded investment 440 1,615
Interest income recognized 148 50
Commercial & Industrial [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance 7,614 1,207
Recorded investment with no allowance 7,359 990
Recorded investment with an allowance 22 41
Total recorded investment 7,381 1,031
Related allowance 14 22
Average recorded investment 7,049 3,645
Interest income recognized 560 109
Troubled Debt Restructurings [Abstract]    
TDR's loans impaired 501 861
Agricultural [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance 1,097 2,578
Recorded investment with no allowance 1,097 2,273
Recorded investment with an allowance 0 290
Total recorded investment 1,097 2,563
Related allowance 0 64
Average recorded investment 1,313 2,042
Interest income recognized 82 178
Consumer [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance 5 88
Recorded investment with no allowance 0 61
Recorded investment with an allowance 0 15
Total recorded investment 0 76
Related allowance 0 10
Average recorded investment 28 219
Interest income recognized $ 1 5
Commercial Real Estate [Member]    
Troubled Debt Restructurings [Abstract]    
TDR's loans impaired   $ 675