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Loans (Aging of Past Due Loans) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | $ 17,736 | $ 20,489 |  |
Loans Not Past Due | 3,103,245 | 3,071,509 |  |
Total | 3,120,981 | 3,091,998 |  | $ 3,081,973
30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 4,582 | 5,219 |  |
60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 536 | 7,545 |  |
Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 12,618 | 7,725 |  |
Commercial and Industrial Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 3,095 | 3,827 |  |
Loans Not Past Due | 669,205 | 634,946 |  |
Total | 672,300 | 638,773 | $ 534,692 | 589,758
Commercial and Industrial Loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 729 | 477 |  |
Commercial and Industrial Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 384 | 909 |  |
Commercial and Industrial Loans | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 1,982 | 2,441 |  |
Commercial Real Estate Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 8,684 | 8,564 |  |
Loans Not Past Due | 1,483,933 | 1,458,833 |  |
Total | 1,492,617 | 1,467,397 | 1,500,247 | 1,495,862
Commercial Real Estate Loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 158 | 5 |  |
Commercial Real Estate Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 0 | 4,877 |  |
Commercial Real Estate Loans | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 8,526 | 3,682 |  |
Agricultural Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 651 | 651 |  |
Loans Not Past Due | 346,580 | 375,535 |  |
Total | 347,231 | 376,186 | 384,654 | 384,526
Agricultural Loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 0 | 0 |  |
Agricultural Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 0 | 0 |  |
Agricultural Loans | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 651 | 651 |  |
Leases |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 0 | 0 |  |
Loans Not Past Due | 55,714 | 55,664 |  |
Total | 55,714 | 55,664 | 57,257 |
Leases | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 0 | 0 |  |
Leases | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 0 | 0 |  |
Leases | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 0 | 0 |  |
Home Equity Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 694 | 948 |  |
Loans Not Past Due | 211,612 | 218,400 |  |
Total | 212,306 | 219,348 | 225,790 | 225,755
Home Equity Loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 327 | 672 |  |
Home Equity Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 74 | 5 |  |
Home Equity Loans | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 293 | 271 |  |
Consumer Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 460 | 382 |  |
Loans Not Past Due | 60,110 | 66,335 |  |
Total | 60,570 | 66,717 | 69,264 | 81,217
Consumer Loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 328 | 233 |  |
Consumer Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 38 | 84 |  |
Consumer Loans | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 94 | 65 |  |
Credit Cards |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 185 | 261 |  |
Loans Not Past Due | 12,424 | 11,376 |  |
Total | 12,609 | 11,637 | 11,953 |
Credit Cards | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 26 | 95 |  |
Credit Cards | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 5 | 80 |  |
Credit Cards | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 154 | 86 |  |
Residential Mortgage Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 3,967 | 5,856 |  |
Loans Not Past Due | 263,667 | 250,420 |  |
Total | 267,634 | 256,276 | $ 305,002 | $ 304,855
Residential Mortgage Loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 3,014 | 3,737 |  |
Residential Mortgage Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | 35 | 1,590 |  |
Residential Mortgage Loans | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due | $ 918 | $ 529 |  |

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