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Loans, Trouble Debt Restructuring (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Contract
Sep. 30, 2016
USD ($)
Contract
Sep. 30, 2017
USD ($)
Contract
Sep. 30, 2016
USD ($)
Contract
Dec. 31, 2016
USD ($)
Loans [Abstract]          
Reserves of allowance for loan losses $ 85   $ 85   $ 29
Financing receivable modifications [Abstract]          
Number of contract, subsequently defaults | Contract 0 0 0 0  
Interest Modification [Member]          
Financing receivable modifications [Abstract]          
Number of contracts | Contract 0 0 0 0  
Pre-modification outstanding recorded investment $ 0 $ 0 $ 0 $ 0  
Post-modification outstanding recorded investment $ 0 $ 0 $ 0 $ 0  
Term Modification [Member]          
Financing receivable modifications [Abstract]          
Number of contracts | Contract 3 4 10 7  
Pre-modification outstanding recorded investment $ 311 $ 3,826 $ 7,108 $ 4,264  
Post-modification outstanding recorded investment $ 311 $ 3,826 $ 7,108 $ 4,264  
Real Estate Loans [Member] | Commercial [Member] | Interest Modification [Member]          
Financing receivable modifications [Abstract]          
Number of contracts | Contract   0 0 0  
Pre-modification outstanding recorded investment   $ 0 $ 0 $ 0  
Post-modification outstanding recorded investment   $ 0 $ 0 $ 0  
Real Estate Loans [Member] | Commercial [Member] | Term Modification [Member]          
Financing receivable modifications [Abstract]          
Number of contracts | Contract   1 7 4  
Pre-modification outstanding recorded investment   $ 750 $ 6,797 $ 1,188  
Post-modification outstanding recorded investment   $ 750 $ 6,797 $ 1,188  
Real Estate Loans [Member] | Agricultural [Member] | Interest Modification [Member]          
Financing receivable modifications [Abstract]          
Number of contracts | Contract 0   0    
Pre-modification outstanding recorded investment $ 0   $ 0    
Post-modification outstanding recorded investment $ 0   $ 0    
Real Estate Loans [Member] | Agricultural [Member] | Term Modification [Member]          
Financing receivable modifications [Abstract]          
Number of contracts | Contract 2   2    
Pre-modification outstanding recorded investment $ 150   $ 150    
Post-modification outstanding recorded investment $ 150   $ 150    
Other Commercial Loans [Member] | Interest Modification [Member]          
Financing receivable modifications [Abstract]          
Number of contracts | Contract   0   0  
Pre-modification outstanding recorded investment   $ 0   $ 0  
Post-modification outstanding recorded investment   $ 0   $ 0  
Other Commercial Loans [Member] | Term Modification [Member]          
Financing receivable modifications [Abstract]          
Number of contracts | Contract   3   3  
Pre-modification outstanding recorded investment   $ 3,076   $ 3,076  
Post-modification outstanding recorded investment   $ 3,076   $ 3,076  
Other Agricultural Loans [Member] | Interest Modification [Member]          
Financing receivable modifications [Abstract]          
Number of contracts | Contract 0   0    
Pre-modification outstanding recorded investment $ 0   $ 0    
Post-modification outstanding recorded investment $ 0   $ 0    
Other Agricultural Loans [Member] | Term Modification [Member]          
Financing receivable modifications [Abstract]          
Number of contracts | Contract 1   1    
Pre-modification outstanding recorded investment $ 161   $ 161    
Post-modification outstanding recorded investment $ 161   $ 161