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Loans (Collateral-dependent Loans by Class) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 3,091,998 |  | $ 3,081,973
Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 21,121 |  |
Equipment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 3,018 |  |
Accounts Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 669 |  |
Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 1,687 |  |
Total |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 26,495 |  |
Commercial and Industrial Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 638,773 | $ 534,692 | 589,758
Commercial and Industrial Loans | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 4,943 |  |
Commercial and Industrial Loans | Equipment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 3,014 |  |
Commercial and Industrial Loans | Accounts Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 669 |  |
Commercial and Industrial Loans | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 154 |  |
Commercial and Industrial Loans | Total |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 8,780 |  |
Commercial Real Estate Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 1,467,397 | 1,500,247 | 1,495,862
Commercial Real Estate Loans | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 11,877 |  |
Commercial Real Estate Loans | Equipment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 0 |  |
Commercial Real Estate Loans | Accounts Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 0 |  |
Commercial Real Estate Loans | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 1,530 |  |
Commercial Real Estate Loans | Total |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 13,407 |  |
Agricultural Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 376,186 | 384,654 | 384,526
Agricultural Loans | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 3,064 |  |
Agricultural Loans | Equipment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 0 |  |
Agricultural Loans | Accounts Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 0 |  |
Agricultural Loans | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 0 |  |
Agricultural Loans | Total |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 3,064 |  |
Leases |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 55,664 | 57,257 |
Leases | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 0 |  |
Leases | Equipment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 0 |  |
Leases | Accounts Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 0 |  |
Leases | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 0 |  |
Leases | Total |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 0 |  |
Home Equity Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 219,348 | 225,790 | 225,755
Home Equity Loans | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 416 |  |
Home Equity Loans | Equipment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 0 |  |
Home Equity Loans | Accounts Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 0 |  |
Home Equity Loans | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 0 |  |
Home Equity Loans | Total |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 416 |  |
Consumer Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 66,717 | 69,264 | 81,217
Consumer Loans | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 4 |  |
Consumer Loans | Equipment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 4 |  |
Consumer Loans | Accounts Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 0 |  |
Consumer Loans | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 3 |  |
Consumer Loans | Total |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 11 |  |
Credit Cards |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 11,637 | 11,953 |
Credit Cards | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 0 |  |
Credit Cards | Equipment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 0 |  |
Credit Cards | Accounts Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 0 |  |
Credit Cards | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 0 |  |
Credit Cards | Total |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 0 |  |
Residential Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 256,276 | $ 305,002 | $ 304,855
Residential Mortgage Loans | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 817 |  |
Residential Mortgage Loans | Equipment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 0 |  |
Residential Mortgage Loans | Accounts Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 0 |  |
Residential Mortgage Loans | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 0 |  |
Residential Mortgage Loans | Total |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 817 |  |

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