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Loans (Schedule of Risk Category of Loans) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | $ 2,725,212 | [1] | $ 2,744,042 | [2]
Loans Acquired With Deteriorated Credit Quality |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 10,472 |  | 11,556 |
Loans Acquired With Deteriorated Credit Quality | Loans Acquired in Current Year |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income |  |  | 481,901 |
Commercial and Industrial Loans and Leases |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 557,660 | [1] | 545,342 | [2]
Commercial and Industrial Loans and Leases | Loans Acquired With Deteriorated Credit Quality |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 902 |  | 1,038 |
Commercial Real Estate Loans |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 1,215,532 | [1] | 1,211,882 | [2]
Commercial Real Estate Loans | Loans Acquired With Deteriorated Credit Quality |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 6,127 |  | 6,993 |
Agricultural Loans |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 353,606 | [1] | 370,694 | [2]
Agricultural Loans | Loans Acquired With Deteriorated Credit Quality |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 1,798 |  | 1,877 |
Pass |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 2,005,703 |  | 1,996,743 |
Pass | Loans Acquired With Deteriorated Credit Quality |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 289 |  | 0 |
Pass | Loans Acquired With Deteriorated Credit Quality | Loans Acquired in Current Year |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income |  |  | 250,415 |
Pass | Commercial and Industrial Loans and Leases |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 529,641 |  | 517,497 |
Pass | Commercial Real Estate Loans |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 1,174,789 |  | 1,165,937 |
Pass | Agricultural Loans |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 301,273 |  | 313,309 |
Special Mention |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 70,621 |  | 75,247 |
Special Mention | Loans Acquired With Deteriorated Credit Quality |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 1,438 |  | 1,436 |
Special Mention | Loans Acquired With Deteriorated Credit Quality | Loans Acquired in Current Year |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income |  |  | 14,972 |
Special Mention | Commercial and Industrial Loans and Leases |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 8,155 |  | 7,541 |
Special Mention | Commercial Real Estate Loans |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 24,998 |  | 26,723 |
Special Mention | Agricultural Loans |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 37,468 |  | 40,983 |
Substandard |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 50,474 |  | 55,928 |
Substandard | Loans Acquired With Deteriorated Credit Quality |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 7,100 |  | 8,472 |
Substandard | Loans Acquired With Deteriorated Credit Quality | Loans Acquired in Current Year |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income |  |  | 11,521 |
Substandard | Commercial and Industrial Loans and Leases |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 19,864 |  | 20,304 |
Substandard | Commercial Real Estate Loans |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 15,745 |  | 19,222 |
Substandard | Agricultural Loans |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 14,865 |  | 16,402 |
Doubtful |  |  |  |
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 | Loans Acquired in Current Year |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income |  |  | 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 |
Total |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 2,126,798 |  | 2,127,918 |
Total | Loans Acquired With Deteriorated Credit Quality |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 8,827 |  | 9,908 |
Total | Loans Acquired With Deteriorated Credit Quality | Loans Acquired in Current Year |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income |  |  | 276,908 |
Total | Commercial and Industrial Loans and Leases |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 557,660 |  | 545,342 |
Total | Commercial Real Estate Loans |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | 1,215,532 |  | 1,211,882 |
Total | Agricultural Loans |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans, net of deferred income | $ 353,606 |  | $ 370,694 |
[1] | Total recorded investment in loans includes $12,798 in accrued interest.
[2] | Total recorded investment in loans includes $12,301 in accrued interest.

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