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Allowance for Credit Losses, Loans by Class Modified as Troubled Debt Restructured Loans (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Loan
Dec. 31, 2018
USD ($)
Loan
Troubled Debt Restructured Loans [Abstract]    
Specific reserves allocated to troubled debt restructured loans & leases $ 612 $ 511
Commitments to lend additional amounts to customers with outstanding loans that are classified as troubled debt restructurings $ 0 $ 0
Loans by class modified as troubled debt restructured loans [Abstract]    
Number of Loans | Loan 2 3
Pre-Modification Outstanding Recorded Investment $ 396 $ 7,525
Post-Modification Recorded Outstanding Investment 396 7,494
Increase in allowance for loan losses due to TDR 101  
TDR's charge-offs $ 0 $ 31
Number of loans modified as troubled debt restructurings with subsequent payment defaults | Loan 0 0
Threshold period after which loan is considered to be in payment default 90 days  
Stated Interest Rate Reduction [Member]    
Troubled Debt Restructured Loans [Abstract]    
Period of modifications 5 years  
Extended Maturity [Member]    
Troubled Debt Restructured Loans [Abstract]    
Period of modifications 10 years  
Extended Maturity [Member] | Minimum [Member]    
Troubled Debt Restructured Loans [Abstract]    
Period of modifications 3 months  
Extended Maturity [Member] | Maximum [Member]    
Troubled Debt Restructured Loans [Abstract]    
Period of modifications 6 years  
Performing [Member]    
Troubled Debt Restructured Loans [Abstract]    
Troubled debt restructured loans $ 12,100 $ 13,600
Agricultural [Member]    
Loans by class modified as troubled debt restructured loans [Abstract]    
Number of Loans | Loan 1  
Pre-Modification Outstanding Recorded Investment $ 201  
Post-Modification Recorded Outstanding Investment $ 201  
Agricultural Real Estate [Member]    
Loans by class modified as troubled debt restructured loans [Abstract]    
Number of Loans | Loan   1
Pre-Modification Outstanding Recorded Investment   $ 7,239
Post-Modification Recorded Outstanding Investment   $ 7,239
Residential 1st Mortgages [Member]    
Loans by class modified as troubled debt restructured loans [Abstract]    
Number of Loans | Loan   2
Pre-Modification Outstanding Recorded Investment   $ 286
Post-Modification Recorded Outstanding Investment   $ 255
Consumer & Other [Member]    
Loans by class modified as troubled debt restructured loans [Abstract]    
Number of Loans | Loan 1  
Pre-Modification Outstanding Recorded Investment $ 195  
Post-Modification Recorded Outstanding Investment $ 195