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Loans (Schedule of Aging of Recorded Investment in Loans) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total | $ 2,744,042 | [1] | $ 2,154,502 | [2] |
Total Past Due | 21,364 | [1] | 11,975 | [2] |
Loans Not Past Due | 2,722,678 | [1] | 2,142,527 | [2] |
Accrued interest receivable included in total recorded investment in loans and leases | 12,301 |  | 9,483 |  |
Commercial and Industrial Loans and Leases |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total | 545,342 | [1] | 488,058 | [2] |
Total Past Due | 5,669 |  | 2,479 |  |
Loans Not Past Due | 539,673 |  | 485,579 |  |
Commercial Real Estate Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total | 1,211,882 | [1] | 929,040 | [2] |
Total Past Due | 4,505 |  | 3,556 |  |
Loans Not Past Due | 1,207,377 |  | 925,484 |  |
Agricultural Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total | 370,694 | [1] | 337,801 | [2] |
Total Past Due | 1,642 |  | 295 |  |
Loans Not Past Due | 369,052 |  | 337,506 |  |
Home Equity Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total | 209,009 | [1] | 152,757 | [2] |
Total Past Due | 656 |  | 658 |  |
Loans Not Past Due | 208,353 |  | 152,099 |  |
Consumer Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total | 77,761 | [1] | 67,647 | [2] |
Total Past Due | 1,214 |  | 629 |  |
Loans Not Past Due | 76,547 |  | 67,018 |  |
Residential Mortgage Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total | 329,354 | [1] | 179,199 | [2] |
Total Past Due | 7,678 |  | 4,358 |  |
Loans Not Past Due | 321,676 |  | 174,841 |  |
30-59 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 12,958 | [1] | 4,927 | [2] |
30-59 Days Past Due | Commercial and Industrial Loans and Leases |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 5,414 |  | 209 |  |
30-59 Days Past Due | Commercial Real Estate Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 768 |  | 1,229 |  |
30-59 Days Past Due | Agricultural Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 563 |  | 27 |  |
30-59 Days Past Due | Home Equity Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 471 |  | 366 |  |
30-59 Days Past Due | Consumer Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 971 |  | 246 |  |
30-59 Days Past Due | Residential Mortgage Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 4,771 |  | 2,850 |  |
60-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 3,432 | [1] | 4,452 | [2] |
60-89 Days Past Due | Commercial and Industrial Loans and Leases |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 183 |  | 1,365 |  |
60-89 Days Past Due | Commercial Real Estate Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 705 |  | 1,650 |  |
60-89 Days Past Due | Agricultural Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 805 |  | 0 |  |
60-89 Days Past Due | Home Equity Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 125 |  | 93 |  |
60-89 Days Past Due | Consumer Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 94 |  | 97 |  |
60-89 Days Past Due | Residential Mortgage Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 1,520 |  | 1,247 |  |
90 Days or More Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 4,974 | [1] | 2,596 | [2] |
90 Days or More Past Due | Commercial and Industrial Loans and Leases |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 72 |  | 905 |  |
90 Days or More Past Due | Commercial Real Estate Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 3,032 |  | 677 |  |
90 Days or More Past Due | Agricultural Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 274 |  | 268 |  |
90 Days or More Past Due | Home Equity Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 60 |  | 199 |  |
90 Days or More Past Due | Consumer Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 149 |  | 286 |  |
90 Days or More Past Due | Residential Mortgage Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 1,387 |  | 261 |  |
Loans Acquired with Deteriorated Credit Quality |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total | 11,556 |  | 9,117 |  | $ 11,048
Total Past Due | 2,592 |  | 443 |  |
Loans Not Past Due | 8,964 |  | 8,674 |  |
Loans Acquired with Deteriorated Credit Quality | Commercial and Industrial Loans and Leases |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total | 1,038 |  | 988 |  | 1,656
Loans Acquired with Deteriorated Credit Quality | Commercial Real Estate Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total | 6,993 |  | 6,452 |  | 7,688
Loans Acquired with Deteriorated Credit Quality | Agricultural Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total | 1,877 |  | 789 |  | 706
Loans Acquired with Deteriorated Credit Quality | Home Equity Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total | 365 |  | 0 |  | 0
Loans Acquired with Deteriorated Credit Quality | Consumer Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total | 0 |  | 0 |  | 53
Loans Acquired with Deteriorated Credit Quality | Residential Mortgage Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total | 1,283 |  | 888 |  | $ 945
Loans Acquired with Deteriorated Credit Quality | 30-59 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 448 |  | 342 |  |
Loans Acquired with Deteriorated Credit Quality | 60-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 885 |  | 74 |  |
Loans Acquired with Deteriorated Credit Quality | 90 Days or More Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 1,259 |  | $ 27 |  |
Loans Acquired with Deteriorated Credit Quality | Branch and Bank Acquisitions |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total | 481,901 |  |  |  |
Total Past Due | 6,382 |  |  |  |
Loans Not Past Due | 475,519 |  |  |  |
Loans Acquired with Deteriorated Credit Quality | Branch and Bank Acquisitions | 30-59 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 2,571 |  |  |  |
Loans Acquired with Deteriorated Credit Quality | Branch and Bank Acquisitions | 60-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | 1,620 |  |  |  |
Loans Acquired with Deteriorated Credit Quality | Branch and Bank Acquisitions | 90 Days or More Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | $ 2,191 |  |  |  |
[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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