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Allowance for Credit Losses, Impaired Loans & Lease (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
With no related allowance recorded [Abstract]      
Recorded Investment $ 6,122 $ 10,024 $ 5,716
Unpaid Principal Balance 6,165 10,024 5,716
Average Recorded Investment 5,919 7,883 6,772
Interest Income Recognized 149 133 403
With an allowance recorded [Abstract]      
Recorded Investment 2,221 2,557 2,651
Unpaid Principal Balance 2,456 2,779 2,929
Related Allowance 150 550 248
Average Recorded Investment 2,437 4,464 2,603
Interest Income Recognized 32 26 171
Total [Abstract]      
Recorded Investment 8,343 12,581 8,367
Unpaid Principal Balance 8,621 12,803 8,645
Related Allowance 150 550 248
Average Recorded Investment 8,356 12,347 9,375
Interest Income Recognized 181 159 574
Commercial Real Estate [Member]      
With no related allowance recorded [Abstract]      
Recorded Investment 0 2,888 84
Unpaid Principal Balance 0 2,888 84
Average Recorded Investment 42 1,487 764
Interest Income Recognized 0 29 35
With an allowance recorded [Abstract]      
Recorded Investment 83 0 0
Unpaid Principal Balance 83 0 0
Related Allowance 1 0 0
Average Recorded Investment 42 1,411 21
Interest Income Recognized 3 0 1
Total [Abstract]      
Related Allowance 1 0 0
Agricultural Real Estate [Member]      
With no related allowance recorded [Abstract]      
Recorded Investment 5,629 5,629 5,629
Unpaid Principal Balance 5,629 5,629 5,629
Average Recorded Investment 5,629 5,642 5,629
Interest Income Recognized 149 89 352
With an allowance recorded [Abstract]      
Recorded Investment   549 0
Unpaid Principal Balance   549 0
Related Allowance   214 0
Average Recorded Investment   275 137
Interest Income Recognized   0 0
Total [Abstract]      
Related Allowance   214 0
Residential 1st Mortgages [Member]      
With an allowance recorded [Abstract]      
Recorded Investment 1,661 1,550 1,671
Unpaid Principal Balance 1,884 1,761 1,895
Related Allowance 83 77 84
Average Recorded Investment 1,666 1,556 1,652
Interest Income Recognized 20 19 76
Total [Abstract]      
Related Allowance 83 77 84
Home Equity Lines and Loans [Member]      
With an allowance recorded [Abstract]      
Recorded Investment 63 67 64
Unpaid Principal Balance 74 78 75
Related Allowance 3 3 3
Average Recorded Investment 64 68 66
Interest Income Recognized 1 1 4
Total [Abstract]      
Related Allowance 3 3 3
Agricultural [Member]      
With no related allowance recorded [Abstract]      
Recorded Investment 493   3
Unpaid Principal Balance 536   3
Average Recorded Investment 248   2
Interest Income Recognized 0   0
With an allowance recorded [Abstract]      
Recorded Investment 0 184 492
Unpaid Principal Balance 0 184 534
Related Allowance 0 184 92
Average Recorded Investment 246 186 410
Interest Income Recognized 0 2 59
Total [Abstract]      
Related Allowance 0 184 92
Commercial [Member]      
With no related allowance recorded [Abstract]      
Recorded Investment   1,507 0
Unpaid Principal Balance   1,507 0
Average Recorded Investment   754 377
Interest Income Recognized   15 16
With an allowance recorded [Abstract]      
Recorded Investment 228 11 234
Unpaid Principal Balance 228 11 234
Related Allowance 15 11 13
Average Recorded Investment 231 770 123
Interest Income Recognized 4 0 18
Total [Abstract]      
Related Allowance 15 11 13
Consumer & Other [Member]      
With an allowance recorded [Abstract]      
Recorded Investment 186 196 190
Unpaid Principal Balance 187 196 191
Related Allowance 48 61 56
Average Recorded Investment 188 198 194
Interest Income Recognized 4 4 13
Total [Abstract]      
Related Allowance $ 48 $ 61 $ 56