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Loans (Aging of the Recorded Investment in Past Due Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |  |
Total | [1] |  | $ 3,095,902 |
Total Past Due |  | $ 15,329 | 19,974 | [1]
Loans Not Past Due |  | 3,209,903 | 3,075,928 | [1]
Accrued interest included in recorded investment |  | 14,995 | 13,929 |
Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total |  |  | 12,798 |
Total Past Due |  |  | 1,607 |
Loans Not Past Due |  |  | 11,191 |
Acquired with Deteriorated Credit Quality | Loans Acquired In Current Year |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total |  |  | 321,464 |
Total Past Due |  |  | 1,437 |
Loans Not Past Due |  |  | 320,027 |
30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 5,760 | 11,879 | [1]
30-59 Days Past Due | Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  |  | 18 |
30-59 Days Past Due | Acquired with Deteriorated Credit Quality | Loans Acquired In Current Year |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  |  | 639 |
60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 2,888 | 2,384 | [1]
60-89 Days Past Due | Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  |  | 0 |
60-89 Days Past Due | Acquired with Deteriorated Credit Quality | Loans Acquired In Current Year |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  |  | 1 |
Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 6,681 | 5,711 | [1]
Greater Than 89 Days Past Due | Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  |  | 1,589 |
Greater Than 89 Days Past Due | Acquired with Deteriorated Credit Quality | Loans Acquired In Current Year |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  |  | 797 |
Commercial and Industrial Loans and Leases |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total | [1] |  | 591,403 |
Total Past Due |  |  | 5,571 |
Loans Not Past Due |  |  | 585,832 |
Commercial and Industrial Loans and Leases | Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total |  |  | 1,368 |
Commercial and Industrial Loans and Leases | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  |  | 4,689 |
Commercial and Industrial Loans and Leases | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  |  | 83 |
Commercial and Industrial Loans and Leases | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  |  | 799 |
Commercial Real Estate Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total | [1] |  | 1,499,864 |
Total Past Due |  | 2,595 | 2,746 |
Loans Not Past Due |  | 1,450,685 | 1,497,118 |
Commercial Real Estate Loans | Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total |  |  | 7,212 |
Commercial Real Estate Loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 1,637 | 209 |
Commercial Real Estate Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 0 | 431 |
Commercial Real Estate Loans | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 958 | 2,106 |
Agricultural Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total | [1] |  | 390,871 |
Total Past Due |  | 651 | 828 |
Loans Not Past Due |  | 375,564 | 390,043 |
Agricultural Loans | Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total |  |  | 3,161 |
Agricultural Loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 0 | 499 |
Agricultural Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 578 | 0 |
Agricultural Loans | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 73 | 329 |
Home Equity Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total | [1] |  | 226,775 |
Total Past Due |  | 714 | 1,454 |
Loans Not Past Due |  | 217,926 | 225,321 |
Home Equity Loans | Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total |  |  | 369 |
Home Equity Loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 401 | 1,121 |
Home Equity Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 113 | 253 |
Home Equity Loans | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 200 | 80 |
Consumer Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total | [1] |  | 81,429 |
Total Past Due |  | 404 | 592 |
Loans Not Past Due |  | 64,515 | 80,837 |
Consumer Loans | Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total |  |  | 0 |
Consumer Loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 259 | 347 |
Consumer Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 61 | 156 |
Consumer Loans | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 84 | 89 |
Residential Mortgage Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total | [1] |  | 305,560 |
Total Past Due |  | 6,040 | 8,783 |
Loans Not Past Due |  | 256,399 | 296,777 |
Residential Mortgage Loans | Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total |  |  | 688 |
Residential Mortgage Loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 3,281 | 5,014 |
Residential Mortgage Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 1,947 | 1,461 |
Residential Mortgage Loans | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | $ 812 | $ 2,308 |
[1] | Total recorded investment in loans includes $13,929 in accrued interest.

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