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Loans (Risk Category of Loans by Class) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]        
Total $ 3,120,981 $ 3,091,998   $ 3,081,973
Commercial and Industrial Loans        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current Fiscal Year 176,630 260,788    
Fiscal Year Before Current Fiscal Year 166,111 89,539    
Two Years Before Current Fiscal Year 79,819 50,720    
Three Years Before Current Fiscal Year 45,437 34,881    
Four Years Before Current Fiscal Year 31,762 21,838    
Prior 71,349 55,896    
Revolving Loans Amortized Cost Basis 101,192 125,111    
Total 672,300 638,773 $ 534,692 589,758
Commercial Real Estate Loans        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current Fiscal Year 89,120 297,148    
Fiscal Year Before Current Fiscal Year 302,812 225,718    
Two Years Before Current Fiscal Year 220,563 196,096    
Three Years Before Current Fiscal Year 185,817 208,884    
Four Years Before Current Fiscal Year 192,786 182,886    
Prior 471,863 326,784    
Revolving Loans Amortized Cost Basis 29,656 29,881    
Total 1,492,617 1,467,397 1,500,247 1,495,862
Agricultural Loans        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current Fiscal Year 13,720 61,323    
Fiscal Year Before Current Fiscal Year 57,532 35,433    
Two Years Before Current Fiscal Year 34,123 34,790    
Three Years Before Current Fiscal Year 32,065 42,363    
Four Years Before Current Fiscal Year 37,551 29,875    
Prior 104,084 80,213    
Revolving Loans Amortized Cost Basis 68,156 92,189    
Total 347,231 376,186 384,654 $ 384,526
Leases        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current Fiscal Year 4,996 18,258    
Fiscal Year Before Current Fiscal Year 16,615 17,517    
Two Years Before Current Fiscal Year 16,616 9,176    
Three Years Before Current Fiscal Year 8,235 5,415    
Four Years Before Current Fiscal Year 4,643 1,605    
Prior 4,609 3,693    
Revolving Loans Amortized Cost Basis 0 0    
Total 55,714 55,664 $ 57,257  
Pass | Commercial and Industrial Loans        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current Fiscal Year 176,630 260,027    
Fiscal Year Before Current Fiscal Year 165,352 88,273    
Two Years Before Current Fiscal Year 78,654 46,681    
Three Years Before Current Fiscal Year 41,565 31,612    
Four Years Before Current Fiscal Year 28,684 21,025    
Prior 64,123 48,508    
Revolving Loans Amortized Cost Basis 85,946 109,228    
Total 640,954 605,354    
Pass | Commercial Real Estate Loans        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current Fiscal Year 89,120 296,265    
Fiscal Year Before Current Fiscal Year 301,184 215,226    
Two Years Before Current Fiscal Year 210,976 179,129    
Three Years Before Current Fiscal Year 168,708 183,703    
Four Years Before Current Fiscal Year 167,909 171,016    
Prior 436,255 295,641    
Revolving Loans Amortized Cost Basis 29,556 29,634    
Total 1,403,708 1,370,614    
Pass | Agricultural Loans        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current Fiscal Year 13,084 49,242    
Fiscal Year Before Current Fiscal Year 43,509 25,449    
Two Years Before Current Fiscal Year 24,244 31,285    
Three Years Before Current Fiscal Year 28,419 32,368    
Four Years Before Current Fiscal Year 27,630 22,702    
Prior 81,385 64,890    
Revolving Loans Amortized Cost Basis 55,256 75,871    
Total 273,527 301,807    
Pass | Leases        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current Fiscal Year 4,996 18,258    
Fiscal Year Before Current Fiscal Year 16,615 17,517    
Two Years Before Current Fiscal Year 16,616 9,176    
Three Years Before Current Fiscal Year 8,235 5,415    
Four Years Before Current Fiscal Year 4,643 1,605    
Prior 4,609 3,693    
Revolving Loans Amortized Cost Basis 0 0    
Total 55,714 55,664    
Special Mention | Commercial and Industrial Loans        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current Fiscal Year 0 618    
Fiscal Year Before Current Fiscal Year 573 1,102    
Two Years Before Current Fiscal Year 1,011 2,756    
Three Years Before Current Fiscal Year 1,996 1,739    
Four Years Before Current Fiscal Year 1,585 206    
Prior 2,070 1,972    
Revolving Loans Amortized Cost Basis 9,313 9,948    
Total 16,548 18,341    
Special Mention | Commercial Real Estate Loans        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current Fiscal Year 0 883    
Fiscal Year Before Current Fiscal Year 1,628 9,361    
Two Years Before Current Fiscal Year 1,222 15,232    
Three Years Before Current Fiscal Year 15,387 23,489    
Four Years Before Current Fiscal Year 23,220 7,578    
Prior 20,791 20,294    
Revolving Loans Amortized Cost Basis 0 147    
Total 62,248 76,984    
Special Mention | Agricultural Loans        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current Fiscal Year 636 11,503    
Fiscal Year Before Current Fiscal Year 13,445 9,911    
Two Years Before Current Fiscal Year 9,806 3,111    
Three Years Before Current Fiscal Year 3,262 8,767    
Four Years Before Current Fiscal Year 8,765 2,707    
Prior 13,227 10,125    
Revolving Loans Amortized Cost Basis 12,900 16,318    
Total 62,041 62,442    
Special Mention | Leases        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current Fiscal Year 0 0    
Fiscal Year Before Current Fiscal Year 0 0    
Two Years Before Current Fiscal Year 0 0    
Three Years Before Current Fiscal Year 0 0    
Four Years Before Current Fiscal Year 0 0    
Prior 0 0    
Revolving Loans Amortized Cost Basis 0 0    
Total 0 0    
Substandard | Commercial and Industrial Loans        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current Fiscal Year 0 143    
Fiscal Year Before Current Fiscal Year 186 164    
Two Years Before Current Fiscal Year 154 1,283    
Three Years Before Current Fiscal Year 1,876 1,530    
Four Years Before Current Fiscal Year 1,493 607    
Prior 5,156 5,416    
Revolving Loans Amortized Cost Basis 5,933 5,935    
Total 14,798 15,078    
Substandard | Commercial Real Estate Loans        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current Fiscal Year 0 0    
Fiscal Year Before Current Fiscal Year 0 1,131    
Two Years Before Current Fiscal Year 8,365 1,735    
Three Years Before Current Fiscal Year 1,722 1,692    
Four Years Before Current Fiscal Year 1,657 4,292    
Prior 14,817 10,849    
Revolving Loans Amortized Cost Basis 100 100    
Total 26,661 19,799    
Substandard | Agricultural Loans        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current Fiscal Year 0 578    
Fiscal Year Before Current Fiscal Year 578 73    
Two Years Before Current Fiscal Year 73 394    
Three Years Before Current Fiscal Year 384 1,228    
Four Years Before Current Fiscal Year 1,156 4,466    
Prior 9,472 5,198    
Revolving Loans Amortized Cost Basis 0 0    
Total 11,663 11,937    
Substandard | Leases        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current Fiscal Year 0 0    
Fiscal Year Before Current Fiscal Year 0 0    
Two Years Before Current Fiscal Year 0 0    
Three Years Before Current Fiscal Year 0 0    
Four Years Before Current Fiscal Year 0 0    
Prior 0 0    
Revolving Loans Amortized Cost Basis 0 0    
Total 0 0    
Doubtful | Commercial and Industrial Loans        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current Fiscal Year 0 0    
Fiscal Year Before Current Fiscal Year 0 0    
Two Years Before Current Fiscal Year 0 0    
Three Years Before Current Fiscal Year 0 0    
Four Years Before Current Fiscal Year 0 0    
Prior 0 0    
Revolving Loans Amortized Cost Basis 0 0    
Total 0 0    
Doubtful | Commercial Real Estate Loans        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current Fiscal Year 0 0    
Fiscal Year Before Current Fiscal Year 0 0    
Two Years Before Current Fiscal Year 0 0    
Three Years Before Current Fiscal Year 0 0    
Four Years Before Current Fiscal Year 0 0    
Prior 0 0    
Revolving Loans Amortized Cost Basis 0 0    
Total 0 0    
Doubtful | Agricultural Loans        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current Fiscal Year 0 0    
Fiscal Year Before Current Fiscal Year 0 0    
Two Years Before Current Fiscal Year 0 0    
Three Years Before Current Fiscal Year 0 0    
Four Years Before Current Fiscal Year 0 0    
Prior 0 0    
Revolving Loans Amortized Cost Basis 0 0    
Total 0 0    
Doubtful | Leases        
Financing Receivable, Credit Quality Indicator [Line Items]        
Current Fiscal Year 0 0    
Fiscal Year Before Current Fiscal Year 0 0    
Two Years Before Current Fiscal Year 0 0    
Three Years Before Current Fiscal Year 0 0    
Four Years Before Current Fiscal Year 0 0    
Prior 0 0    
Revolving Loans Amortized Cost Basis 0 0    
Total $ 0 $ 0