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Loans (Schedule of Carrying Amount of Loans with Deterioration of Credit Quality) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total | $ 2,744,042 | [1] | $ 2,154,502 | [2] |
Commercial and Industrial Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total | 545,342 | [1] | 488,058 | [2] |
Commercial Real Estate Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total | 1,211,882 | [1] | 929,040 | [2] |
Agricultural Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total | 370,694 | [1] | 337,801 | [2] |
Home Equity Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total | 209,009 | [1] | 152,757 | [2] |
Consumer Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total | 77,761 | [1] | 67,647 | [2] |
Residential Mortgage Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total | 329,354 | [1] | 179,199 | [2] |
Loans Acquired with Deteriorated Credit Quality |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total | 11,556 |  | 9,117 |  | $ 11,048
Carrying Amount, Net of Allowance | 11,548 |  | 9,106 |  | 10,943
Loans Acquired with Deteriorated Credit Quality | Commercial and Industrial Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total | 1,038 |  | 988 |  | 1,656
Loans Acquired with Deteriorated Credit Quality | Commercial Real Estate Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total | 6,993 |  | 6,452 |  | 7,688
Loans Acquired with Deteriorated Credit Quality | Agricultural Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total | 1,877 |  | 789 |  | 706
Loans Acquired with Deteriorated Credit Quality | Home Equity Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total | 365 |  | 0 |  | 0
Loans Acquired with Deteriorated Credit Quality | Consumer Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total | 0 |  | 0 |  | 53
Loans Acquired with Deteriorated Credit Quality | Residential Mortgage Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total | $ 1,283 |  | $ 888 |  | $ 945
[1] | Total recorded investment in loans includes $12,301 in accrued interest.
[2] | Total recorded investment in loans includes $9,483 in accrued interest.

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