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Loans (Aging of Past Due Loans) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | $ 3,007,926 | $ 3,091,998 |  | $ 3,081,973
30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 3,182 | 5,219 |  |
60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 808 | 7,545 |  |
Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 7,500 | 7,725 |  |
Total Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 11,490 | 20,489 |  |
Loans Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 2,996,436 | 3,071,509 |  |
Commercial and Industrial Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 493,005 | 638,773 | $ 534,692 | 589,758
Commercial and Industrial Loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 12 | 477 |  |
Commercial and Industrial Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 0 | 909 |  |
Commercial and Industrial Loans | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 6,147 | 2,441 |  |
Commercial and Industrial Loans | Total Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 6,159 | 3,827 |  |
Commercial and Industrial Loans | Loans Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 486,846 | 634,946 |  |
Commercial Real Estate Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 1,530,677 | 1,467,397 | 1,500,247 | 1,495,862
Commercial Real Estate Loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 0 | 5 |  |
Commercial Real Estate Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 5 | 4,877 |  |
Commercial Real Estate Loans | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 891 | 3,682 |  |
Commercial Real Estate Loans | Total Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 896 | 8,564 |  |
Commercial Real Estate Loans | Loans Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 1,529,781 | 1,458,833 |  |
Agricultural Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 358,150 | 376,186 | 384,654 | 384,526
Agricultural Loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 0 | 0 |  |
Agricultural Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 0 | 0 |  |
Agricultural Loans | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 0 | 651 |  |
Agricultural Loans | Total Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 0 | 651 |  |
Agricultural Loans | Loans Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 358,150 | 375,535 |  |
Leases |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 55,345 | 55,664 | 57,257 |
Leases | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 0 | 0 |  |
Leases | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 0 | 0 |  |
Leases | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 0 | 0 |  |
Leases | Total Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 0 | 0 |  |
Leases | Loans Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 55,345 | 55,664 |  |
Home Equity Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 222,525 | 219,348 | 225,790 | 225,755
Home Equity Loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 225 | 672 |  |
Home Equity Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 229 | 5 |  |
Home Equity Loans | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 25 | 271 |  |
Home Equity Loans | Total Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 479 | 948 |  |
Home Equity Loans | Loans Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 222,046 | 218,400 |  |
Consumer Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 70,302 | 66,717 | 69,264 | 81,217
Consumer Loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 158 | 233 |  |
Consumer Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 58 | 84 |  |
Consumer Loans | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 4 | 65 |  |
Consumer Loans | Total Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 220 | 382 |  |
Consumer Loans | Loans Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 70,082 | 66,335 |  |
Credit Cards |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 14,357 | 11,637 | 11,953 |
Credit Cards | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 61 | 95 |  |
Credit Cards | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 9 | 80 |  |
Credit Cards | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 64 | 86 |  |
Credit Cards | Total Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 134 | 261 |  |
Credit Cards | Loans Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 14,223 | 11,376 |  |
Residential Mortgage Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 263,565 | 256,276 | $ 305,002 | $ 304,855
Residential Mortgage Loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 2,726 | 3,737 |  |
Residential Mortgage Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 507 | 1,590 |  |
Residential Mortgage Loans | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 369 | 529 |  |
Residential Mortgage Loans | Total Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 3,602 | 5,856 |  |
Residential Mortgage Loans | Loans Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | $ 259,963 | $ 250,420 |  |

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