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Loans and Related Allowance for Loan Losses (Summary of Information Related to Impaired Loans) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
With no related allowance recorded, Recorded Investment $ 7,500 $ 7,624
With no related allowance recorded, Unpaid Principal Balance 8,607 8,625
With a related allowance, Recorded Investment 2,385 10,235
With a related allowance, Unpaid Principal Balance 3,298 12,403
Total, Recorded Investment 9,885 17,859
Total, Unpaid Principal Balance 11,905 21,028
Related Allowance 584 2,246
Average Investment 14,110 16,394
Interest income recognized on impaired loans 248 430
Mortgage Loans on Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
With no related allowance recorded, Recorded Investment 7,500 7,624
With no related allowance recorded, Unpaid Principal Balance 8,607 8,625
With a related allowance, Recorded Investment 1,924 8,252
With a related allowance, Unpaid Principal Balance 2,831 10,412
Total, Recorded Investment 9,424 15,876
Total, Unpaid Principal Balance 11,438 19,037
Related Allowance 478 1,346
Average Investment 12,719 15,216
Interest income recognized on impaired loans 232 411
Mortgage Loans on Real Estate [Member] | Residential 1-4 Family [Member]    
Financing Receivable, Impaired [Line Items]    
With no related allowance recorded, Recorded Investment 1,483 1,563
With no related allowance recorded, Unpaid Principal Balance 1,850 1,890
With a related allowance, Recorded Investment 1,498 2,131
With a related allowance, Unpaid Principal Balance 1,808 2,538
Total, Recorded Investment 2,981 3,694
Total, Unpaid Principal Balance 3,658 4,428
Related Allowance 380 349
Average Investment 3,395 3,993
Interest income recognized on impaired loans 87 124
Mortgage Loans on Real Estate [Member] | Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
With no related allowance recorded, Recorded Investment 3,226 3,502
With no related allowance recorded, Unpaid Principal Balance 3,966 4,176
With a related allowance, Recorded Investment 378 1,550
With a related allowance, Unpaid Principal Balance 876 2,034
Total, Recorded Investment 3,604 5,052
Total, Unpaid Principal Balance 4,842 6,210
Related Allowance 87 482
Average Investment 4,096 4,822
Interest income recognized on impaired loans 145 164
Mortgage Loans on Real Estate [Member] | Construction and Land Development [Member]    
Financing Receivable, Impaired [Line Items]    
With no related allowance recorded, Recorded Investment 328  
With no related allowance recorded, Unpaid Principal Balance 328  
With a related allowance, Recorded Investment 48 4,571
With a related allowance, Unpaid Principal Balance 147 5,840
Total, Recorded Investment 376 4,571
Total, Unpaid Principal Balance 475 5,840
Related Allowance 11 515
Average Investment 2,709 4,839
Mortgage Loans on Real Estate [Member] | Multifamily [Member]    
Financing Receivable, Impaired [Line Items]    
With no related allowance recorded, Recorded Investment 2,463 2,559
With no related allowance recorded, Unpaid Principal Balance 2,463 2,559
Total, Recorded Investment 2,463 2,559
Total, Unpaid Principal Balance 2,463 2,559
Average Investment 2,519 1,535
Interest income recognized on impaired loans   123
Mortgage Loans on Real Estate [Member] | Agriculture [Member]    
Financing Receivable, Impaired [Line Items]    
Average Investment   27
Commercial Loans [Member]    
Financing Receivable, Impaired [Line Items]    
With a related allowance, Recorded Investment 454 1,983
With a related allowance, Unpaid Principal Balance 460 1,991
Total, Recorded Investment 454 1,983
Total, Unpaid Principal Balance 460 1,991
Related Allowance 105 900
Average Investment 1,386 1,175
Interest income recognized on impaired loans 16 19
Consumer Installment Loans [Member]    
Financing Receivable, Impaired [Line Items]    
With a related allowance, Recorded Investment 7  
With a related allowance, Unpaid Principal Balance 7  
Total, Recorded Investment 7  
Total, Unpaid Principal Balance 7  
Related Allowance 1  
Average Investment $ 5 $ 3