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Loans (Collateral-dependent Loans by Class) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | $ 3,018,416 |  | $ 3,081,973
Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 20,034 |  |
Equipment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 1,028 |  |
Accounts Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 790 |  |
Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 2,857 |  |
Total |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 24,709 |  |
Commercial and Industrial Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 509,947 | $ 534,692 | 589,758
Commercial and Industrial Loans | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 5,357 |  |
Commercial and Industrial Loans | Equipment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 1,028 |  |
Commercial and Industrial Loans | Accounts Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 790 |  |
Commercial and Industrial Loans | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 993 |  |
Commercial and Industrial Loans | Total |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 8,168 |  |
Commercial Real Estate Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 1,489,353 | 1,500,247 | 1,495,862
Commercial Real Estate Loans | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 9,924 |  |
Commercial Real Estate Loans | Equipment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Commercial Real Estate Loans | Accounts Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Commercial Real Estate Loans | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 1,860 |  |
Commercial Real Estate Loans | Total |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 11,784 |  |
Agricultural Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 366,286 | 384,654 | 384,526
Agricultural Loans | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 3,414 |  |
Agricultural Loans | Equipment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Agricultural Loans | Accounts Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Agricultural Loans | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 4 |  |
Agricultural Loans | Total |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 3,418 |  |
Leases |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 55,833 | 57,257 |
Leases | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Leases | Equipment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Leases | Accounts Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Leases | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Leases | Total |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Home Equity Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 224,306 | 225,790 | 225,755
Home Equity Loans | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 401 |  |
Home Equity Loans | Equipment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Home Equity Loans | Accounts Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Home Equity Loans | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Home Equity Loans | Total |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 401 |  |
Consumer Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 68,085 | 69,264 | 81,217
Consumer Loans | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 113 |  |
Consumer Loans | Equipment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Consumer Loans | Accounts Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Consumer Loans | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Consumer Loans | Total |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 113 |  |
Credit Cards |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 11,056 | 11,953 |
Credit Cards | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Credit Cards | Equipment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Credit Cards | Accounts Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Credit Cards | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Credit Cards | Total |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Residential Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 293,550 | $ 305,002 | $ 304,855
Residential Mortgage Loans | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 825 |  |
Residential Mortgage Loans | Equipment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Residential Mortgage Loans | Accounts Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Residential Mortgage Loans | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 0 |  |
Residential Mortgage Loans | Total |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | $ 825 |  |

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