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Loans (Schedule of Risk Category of Loans) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | $ 2,744,042 | [1] | $ 2,154,502 | [2] |
Commercial and Industrial Loans and Leases |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 545,342 | [1] | 488,058 | [2] |
Commercial Real Estate Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 1,211,882 | [1] | 929,040 | [2] |
Agricultural Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 370,694 | [1] | 337,801 | [2] |
Loans Acquired with Deteriorated Credit Quality |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 11,556 |  | 9,117 |  | $ 11,048
Loans Acquired with Deteriorated Credit Quality | Branch and Bank Acquisitions |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 481,901 |  |  |  |
Loans Acquired with Deteriorated Credit Quality | Commercial and Industrial Loans and Leases |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 1,038 |  | 988 |  | 1,656
Loans Acquired with Deteriorated Credit Quality | Commercial Real Estate Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 6,993 |  | 6,452 |  | 7,688
Loans Acquired with Deteriorated Credit Quality | Agricultural Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 1,877 |  | 789 |  | $ 706
Pass |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 1,996,743 |  | 1,660,271 |  |
Pass | Commercial and Industrial Loans and Leases |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 517,497 |  | 462,212 |  |
Pass | Commercial Real Estate Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 1,165,937 |  | 894,027 |  |
Pass | Agricultural Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 313,309 |  | 304,032 |  |
Pass | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 0 |  | 2,604 |  |
Pass | Loans Acquired with Deteriorated Credit Quality | Branch and Bank Acquisitions |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 250,415 |  |  |  |
Special Mention |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 75,247 |  | 53,226 |  |
Special Mention | Commercial and Industrial Loans and Leases |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 7,541 |  | 7,901 |  |
Special Mention | Commercial Real Estate Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 26,723 |  | 18,037 |  |
Special Mention | Agricultural Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 40,983 |  | 27,288 |  |
Special Mention | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 1,436 |  | 1,647 |  |
Special Mention | Loans Acquired with Deteriorated Credit Quality | Branch and Bank Acquisitions |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 14,972 |  |  |  |
Substandard |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 55,928 |  | 41,402 |  |
Substandard | Commercial and Industrial Loans and Leases |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 20,304 |  | 17,945 |  |
Substandard | Commercial Real Estate Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 19,222 |  | 16,976 |  |
Substandard | Agricultural Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 16,402 |  | 6,481 |  |
Substandard | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 8,472 |  | 3,978 |  |
Substandard | Loans Acquired with Deteriorated Credit Quality | Branch and Bank Acquisitions |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 11,521 |  |  |  |
Doubtful |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 0 |  | 0 |  |
Doubtful | Commercial and Industrial Loans and Leases |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 0 |  | 0 |  |
Doubtful | Commercial Real Estate Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 0 |  | 0 |  |
Doubtful | Agricultural Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 0 |  | 0 |  |
Doubtful | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 0 |  | 0 |  |
Doubtful | Loans Acquired with Deteriorated Credit Quality | Branch and Bank Acquisitions |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 0 |  |  |  |
Total |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 2,127,918 |  | 1,754,899 |  |
Total | Commercial and Industrial Loans and Leases |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 545,342 |  | 488,058 |  |
Total | Commercial Real Estate Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 1,211,882 |  | 929,040 |  |
Total | Agricultural Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 370,694 |  | 337,801 |  |
Total | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | 9,908 |  | $ 8,229 |  |
Total | Loans Acquired with Deteriorated Credit Quality | Branch and Bank Acquisitions |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans, net of deferred income | $ 276,908 |  |  |  |
[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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