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Loans (Schedule of Aging of Recorded Investment in Loans) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans, net of deferred income | $ 2,725,212 | [1] | $ 2,744,042 | [2]
Loans Past Due | 17,363 | [1] | 21,364 | [2]
Loans Not Past Due | 2,707,849 | [1] | 2,722,678 | [2]
Accrued interest included in recorded investment | 12,798 |  | 12,301 |
Loans Acquired With Deteriorated Credit Quality |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans, net of deferred income | 10,472 |  | 11,556 |
Loans Past Due | 2,290 |  | 2,592 |
Loans Not Past Due | 8,182 |  | 8,964 |
Loans Acquired With Deteriorated Credit Quality | Loans Acquired in Current Year |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans, net of deferred income |  |  | 481,901 |
Loans Past Due |  |  | 6,382 |
Loans Not Past Due |  |  | 475,519 |
Commercial and Industrial Loans and Leases |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans, net of deferred income | 557,660 | [1] | 545,342 | [2]
Loans Past Due | 4,716 |  | 5,669 |
Loans Not Past Due | 552,944 |  | 539,673 |
Commercial and Industrial Loans and Leases | Loans Acquired With Deteriorated Credit Quality |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans, net of deferred income | 902 |  | 1,038 |
Commercial Real Estate Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans, net of deferred income | 1,215,532 | [1] | 1,211,882 | [2]
Loans Past Due | 3,286 |  | 4,505 |
Loans Not Past Due | 1,212,246 |  | 1,207,377 |
Commercial Real Estate Loans | Loans Acquired With Deteriorated Credit Quality |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans, net of deferred income | 6,127 |  | 6,993 |
Agricultural Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans, net of deferred income | 353,606 | [1] | 370,694 | [2]
Loans Past Due | 1,252 |  | 1,642 |
Loans Not Past Due | 352,354 |  | 369,052 |
Agricultural Loans | Loans Acquired With Deteriorated Credit Quality |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans, net of deferred income | 1,798 |  | 1,877 |
Home Equity Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans, net of deferred income | 204,626 | [1] | 209,009 | [2]
Loans Past Due | 666 |  | 656 |
Loans Not Past Due | 203,960 |  | 208,353 |
Home Equity Loans | Loans Acquired With Deteriorated Credit Quality |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans, net of deferred income | 368 |  | 365 |
Consumer Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans, net of deferred income | 78,356 | [1] | 77,761 | [2]
Loans Past Due | 652 |  | 1,214 |
Loans Not Past Due | 77,704 |  | 76,547 |
Residential Mortgage Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans, net of deferred income | 315,432 | [1] | 329,354 | [2]
Loans Past Due | 6,791 |  | 7,678 |
Loans Not Past Due | 308,641 |  | 321,676 |
Residential Mortgage Loans | Loans Acquired With Deteriorated Credit Quality |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans, net of deferred income | 1,277 |  | 1,283 |
30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 11,343 | [1] | 12,958 | [2]
30-59 Days Past Due | Loans Acquired With Deteriorated Credit Quality |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 0 |  | 448 |
30-59 Days Past Due | Loans Acquired With Deteriorated Credit Quality | Loans Acquired in Current Year |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due |  |  | 2,571 |
30-59 Days Past Due | Commercial and Industrial Loans and Leases |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 4,447 |  | 5,414 |
30-59 Days Past Due | Commercial Real Estate Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 896 |  | 768 |
30-59 Days Past Due | Agricultural Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 16 |  | 563 |
30-59 Days Past Due | Home Equity Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 546 |  | 471 |
30-59 Days Past Due | Consumer Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 216 |  | 971 |
30-59 Days Past Due | Residential Mortgage Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 5,222 |  | 4,771 |
60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 1,024 | [1] | 3,432 | [2]
60-89 Days Past Due | Loans Acquired With Deteriorated Credit Quality |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 68 |  | 885 |
60-89 Days Past Due | Loans Acquired With Deteriorated Credit Quality | Loans Acquired in Current Year |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due |  |  | 1,620 |
60-89 Days Past Due | Commercial and Industrial Loans and Leases |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 218 |  | 183 |
60-89 Days Past Due | Commercial Real Estate Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 68 |  | 705 |
60-89 Days Past Due | Agricultural Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 365 |  | 805 |
60-89 Days Past Due | Home Equity Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 3 |  | 125 |
60-89 Days Past Due | Consumer Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 213 |  | 94 |
60-89 Days Past Due | Residential Mortgage Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 157 |  | 1,520 |
90 Days or More Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 4,996 | [1] | 4,974 | [2]
90 Days or More Past Due | Loans Acquired With Deteriorated Credit Quality |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 2,222 |  | 1,259 |
90 Days or More Past Due | Loans Acquired With Deteriorated Credit Quality | Loans Acquired in Current Year |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due |  |  | 2,191 |
90 Days or More Past Due | Commercial and Industrial Loans and Leases |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 51 |  | 72 |
90 Days or More Past Due | Commercial Real Estate Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 2,322 |  | 3,032 |
90 Days or More Past Due | Agricultural Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 871 |  | 274 |
90 Days or More Past Due | Home Equity Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 117 |  | 60 |
90 Days or More Past Due | Consumer Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | 223 |  | 149 |
90 Days or More Past Due | Residential Mortgage Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans Past Due | $ 1,412 |  | $ 1,387 |
[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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