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Loans (Components of Loans) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans, Gross | $ 2,712,414 | $ 2,731,741 |  |
Less: Unearned Income | (3,582) | (3,682) |  |
Allowance for Loan Losses | (16,243) | (15,823) | $ (14,460) | $ (15,694)
Loans, Net | 2,692,589 | 2,712,236 |  |
Commercial and Industrial Loans and Leases |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for Loan Losses | (3,317) | (2,953) | (3,603) | (4,735)
Commercial Real Estate Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for Loan Losses | (5,741) | (5,291) | (4,622) | (4,591)
Agricultural Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for Loan Losses | (5,453) | (5,776) | (4,825) | (4,894)
Home Equity Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for Loan Losses | (214) | (229) | (272) | (330)
Consumer Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for Loan Losses | (483) | (420) | (316) | (298)
Residential Mortgage Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for Loan Losses | (429) | (472) | $ (327) | $ (343)
Commercial | Commercial and Industrial Loans and Leases |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans, Gross | 555,967 | 543,761 |  |
Commercial | Commercial Real Estate Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans, Gross | 1,212,090 | 1,208,646 |  |
Commercial | Agricultural Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans, Gross | 347,999 | 365,208 |  |
Retail | Home Equity Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans, Gross | 203,611 | 207,987 |  |
Retail | Consumer Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans, Gross | 78,113 | 77,547 |  |
Retail | Residential Mortgage Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans, Gross | $ 314,634 | $ 328,592 |  |

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