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Loans and Allowance for Loan Losses (Details) - Summary of impaired loan activity - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Commercial & industrial [Member]      
With no related allowance recorded:      
With no related allowance recorded, Recorded Investment $ 590   $ 849
With no related allowance recorded, Unpaid Principal Balance 1,386   1,645
With no related allowance recorded, Related Allowance  
With no related allowance recorded, Average Recorded Investment 1,598 $ 1,922 1,878
With no related allowance recorded, Interest Income Recognized 12 15 50
With a specific allowance recorded:      
With a specific allowance recorded, Recorded Investment  
With a specific allowance recorded, Unpaid Principal Balance  
With a specific allowance recorded, Related Allowance  
With a specific allowance recorded, Average Recorded Investment 249
With a specific allowance recorded, Interest Income Recognized
Totals:      
Total Recorded Investment 590   849
Total Unpaid Principal Balance 1,386   1,645
Total Related Allowance  
Total Average Recorded Investment 1,598 2,171 1,878
Total Interest Income Recognized 12 15 50
Commercial real estate - owner occupied [Member ]      
With no related allowance recorded:      
With no related allowance recorded, Recorded Investment 1,450   1,441
With no related allowance recorded, Unpaid Principal Balance 1,450   1,441
With no related allowance recorded, Related Allowance  
With no related allowance recorded, Average Recorded Investment 1,450 1,362 1,573
With no related allowance recorded, Interest Income Recognized 11
With a specific allowance recorded:      
With a specific allowance recorded, Recorded Investment  
With a specific allowance recorded, Unpaid Principal Balance  
With a specific allowance recorded, Related Allowance  
With a specific allowance recorded, Average Recorded Investment
With a specific allowance recorded, Interest Income Recognized
Totals:      
Total Recorded Investment 1,450   1,441
Total Unpaid Principal Balance 1,450   1,441
Total Related Allowance  
Total Average Recorded Investment 1,450 1,362 1,573
Total Interest Income Recognized   11
Commercial real estate - nonowner occupied [Member]      
With no related allowance recorded:      
With no related allowance recorded, Recorded Investment 296   182
With no related allowance recorded, Unpaid Principal Balance 425   182
With no related allowance recorded, Related Allowance  
With no related allowance recorded, Average Recorded Investment 534 473 258
With no related allowance recorded, Interest Income Recognized 7 3 14
With a specific allowance recorded:      
With a specific allowance recorded, Recorded Investment 579   579
With a specific allowance recorded, Unpaid Principal Balance 579   579
With a specific allowance recorded, Related Allowance 174   174
With a specific allowance recorded, Average Recorded Investment 579 579
With a specific allowance recorded, Interest Income Recognized 3
Totals:      
Total Recorded Investment 875   761
Total Unpaid Principal Balance 1,004   761
Total Related Allowance 174   174
Total Average Recorded Investment 1,113 473 837
Total Interest Income Recognized 7 3 17
Agricultural [Member]      
With no related allowance recorded:      
With no related allowance recorded, Recorded Investment  
With no related allowance recorded, Unpaid Principal Balance  
With no related allowance recorded, Related Allowance  
With no related allowance recorded, Average Recorded Investment
With no related allowance recorded, Interest Income Recognized
With a specific allowance recorded:      
With a specific allowance recorded, Recorded Investment  
With a specific allowance recorded, Unpaid Principal Balance  
With a specific allowance recorded, Related Allowance  
With a specific allowance recorded, Average Recorded Investment
With a specific allowance recorded, Interest Income Recognized
Totals:      
Total Recorded Investment  
Total Unpaid Principal Balance  
Total Related Allowance  
Total Average Recorded Investment
Total Interest Income Recognized
Residential real estate [Member]      
With no related allowance recorded:      
With no related allowance recorded, Recorded Investment 1,549   1,017
With no related allowance recorded, Unpaid Principal Balance 1,693   1,084
With no related allowance recorded, Related Allowance  
With no related allowance recorded, Average Recorded Investment 1,843 2,663 1,243
With no related allowance recorded, Interest Income Recognized 7 2 64
With a specific allowance recorded:      
With a specific allowance recorded, Recorded Investment 642   1,729
With a specific allowance recorded, Unpaid Principal Balance 642   1,774
With a specific allowance recorded, Related Allowance 90   160
With a specific allowance recorded, Average Recorded Investment 647 652 1,785
With a specific allowance recorded, Interest Income Recognized 6 5 14
Totals:      
Total Recorded Investment 2,191   2,746
Total Unpaid Principal Balance 2,335   2,858
Total Related Allowance 90   160
Total Average Recorded Investment 2,490 3,315 3,028
Total Interest Income Recognized 13 7 78
HELOC [Member]      
With no related allowance recorded:      
With no related allowance recorded, Recorded Investment 84   89
With no related allowance recorded, Unpaid Principal Balance 84   89
With no related allowance recorded, Average Recorded Investment 86 15 98
With no related allowance recorded, Interest Income Recognized 1 4
With a specific allowance recorded:      
With a specific allowance recorded, Recorded Investment 62   66
With a specific allowance recorded, Unpaid Principal Balance 62   66
With a specific allowance recorded, Related Allowance 3   3
With a specific allowance recorded, Average Recorded Investment 75 83
With a specific allowance recorded, Interest Income Recognized 1 6
Totals:      
Total Recorded Investment 146   155
Total Unpaid Principal Balance 146   155
Total Related Allowance 3   3
Total Average Recorded Investment 161 15 181
Total Interest Income Recognized 2 10
Consumer [Member]      
With no related allowance recorded:      
With no related allowance recorded, Recorded Investment 5   7
With no related allowance recorded, Unpaid Principal Balance 5   7
With no related allowance recorded, Related Allowance  
With no related allowance recorded, Average Recorded Investment 7 15 12
With no related allowance recorded, Interest Income Recognized 1
With a specific allowance recorded:      
With a specific allowance recorded, Recorded Investment  
With a specific allowance recorded, Unpaid Principal Balance  
With a specific allowance recorded, Related Allowance  
With a specific allowance recorded, Average Recorded Investment
With a specific allowance recorded, Interest Income Recognized
Totals:      
Total Recorded Investment 5   7
Total Unpaid Principal Balance 5   7
Total Related Allowance  
Total Average Recorded Investment 7 15 12
Total Interest Income Recognized $ 1