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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 |  |

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