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Loans (Aging of Past Due Loans) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 31,485 |  | $ 19,974 | [1]
Loans Not Past Due |  | 2,986,931 |  | 3,075,928 | [1]
Total |  | 3,018,416 |  | 3,081,973 |
Total | [1] |  |  | 3,095,902 |
Accrued interest included in recorded investment |  | 12,350 |  | 13,929 |
Commercial and Industrial Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 7,444 |  |  |
Loans Not Past Due |  | 502,503 |  |  |
Total |  | 509,947 | $ 534,692 | 589,758 |
Commercial and Industrial Loans and Leases |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 5,571 |
Loans Not Past Due |  |  |  | 585,832 |
Total | [1] |  |  | 591,403 |
Commercial Real Estate Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 10,523 |  | 2,746 |
Loans Not Past Due |  | 1,478,830 |  | 1,497,118 |
Total |  | 1,489,353 | 1,500,247 | 1,495,862 |
Total | [1] |  |  | 1,499,864 |
Agricultural Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 4,130 |  | 828 |
Loans Not Past Due |  | 362,156 |  | 390,043 |
Total |  | 366,286 | 384,654 | 384,526 |
Total | [1] |  |  | 390,871 |
Leases |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  |  |
Loans Not Past Due |  | 55,833 |  |  |
Total |  | 55,833 | 57,257 |  |
Home Equity Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 1,129 |  | 1,454 |
Loans Not Past Due |  | 223,177 |  | 225,321 |
Total |  | 224,306 | 225,790 | 225,755 |
Total | [1] |  |  | 226,775 |
Consumer Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 689 |  | 592 |
Loans Not Past Due |  | 67,396 |  | 80,837 |
Total |  | 68,085 | 69,264 | 81,217 |
Total | [1] |  |  | 81,429 |
Credit Cards |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 296 |  |  |
Loans Not Past Due |  | 10,760 |  |  |
Total |  | 11,056 | 11,953 |  |
Residential Mortgage Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 7,274 |  | 8,783 |
Loans Not Past Due |  | 286,276 |  | 296,777 |
Total |  | 293,550 | $ 305,002 | 304,855 |
Total | [1] |  |  | 305,560 |
30-59 Days Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 16,854 |  | 11,879 | [1]
30-59 Days Past Due | Commercial and Industrial Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 1,936 |  |  |
30-59 Days Past Due | Commercial and Industrial Loans and Leases |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 4,689 |
30-59 Days Past Due | Commercial Real Estate Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 8,238 |  | 209 |
30-59 Days Past Due | Agricultural Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 1,052 |  | 499 |
30-59 Days Past Due | Leases |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  |  |
30-59 Days Past Due | Home Equity Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 753 |  | 1,121 |
30-59 Days Past Due | Consumer Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 501 |  | 347 |
30-59 Days Past Due | Credit Cards |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 221 |  |  |
30-59 Days Past Due | Residential Mortgage Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 4,153 |  | 5,014 |
60-89 Days Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 5,344 |  | 2,384 | [1]
60-89 Days Past Due | Commercial and Industrial Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 319 |  |  |
60-89 Days Past Due | Commercial and Industrial Loans and Leases |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 83 |
60-89 Days Past Due | Commercial Real Estate Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 733 |  | 431 |
60-89 Days Past Due | Agricultural Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 3,078 |  | 0 |
60-89 Days Past Due | Leases |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  |  |
60-89 Days Past Due | Home Equity Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 76 |  | 253 |
60-89 Days Past Due | Consumer Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 51 |  | 156 |
60-89 Days Past Due | Credit Cards |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 21 |  |  |
60-89 Days Past Due | Residential Mortgage Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 1,066 |  | 1,461 |
Greater Than 89 Days Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 9,287 |  | 5,711 | [1]
Greater Than 89 Days Past Due | Commercial and Industrial Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 5,189 |  |  |
Greater Than 89 Days Past Due | Commercial and Industrial Loans and Leases |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 799 |
Greater Than 89 Days Past Due | Commercial Real Estate Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 1,552 |  | 2,106 |
Greater Than 89 Days Past Due | Agricultural Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 329 |
Greater Than 89 Days Past Due | Leases |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  |  |
Greater Than 89 Days Past Due | Home Equity Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 300 |  | 80 |
Greater Than 89 Days Past Due | Consumer Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 137 |  | 89 |
Greater Than 89 Days Past Due | Credit Cards |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 54 |  |  |
Greater Than 89 Days Past Due | Residential Mortgage Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 2,055 |  | 2,308 |
Acquired with Deteriorated Credit Quality |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 1,607 |
Loans Not Past Due |  |  |  | 11,191 |
Total |  |  |  | 12,798 |
Acquired with Deteriorated Credit Quality | Commercial and Industrial Loans and Leases |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total |  |  |  | 1,368 |
Acquired with Deteriorated Credit Quality | Commercial Real Estate Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total |  |  |  | 7,212 |
Acquired with Deteriorated Credit Quality | Agricultural Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total |  |  |  | 3,161 |
Acquired with Deteriorated Credit Quality | Home Equity Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total |  |  |  | 369 |
Acquired with Deteriorated Credit Quality | Residential Mortgage Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total |  |  |  | 688 |
Acquired with Deteriorated Credit Quality | 30-59 Days Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 18 |
Acquired with Deteriorated Credit Quality | 60-89 Days Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 0 |
Acquired with Deteriorated Credit Quality | Greater Than 89 Days Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 1,589 |
Loans Acquired In Current Year | Acquired with Deteriorated Credit Quality |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 1,437 |
Loans Not Past Due |  |  |  | 320,027 |
Total |  |  |  | 321,464 |
Loans Acquired In Current Year | Acquired with Deteriorated Credit Quality | 30-59 Days Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 639 |
Loans Acquired In Current Year | Acquired with Deteriorated Credit Quality | 60-89 Days Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 1 |
Loans Acquired In Current Year | Acquired with Deteriorated Credit Quality | Greater Than 89 Days Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | $ 797 |
[1] | Total recorded investment in loans includes $13,929 in accrued interest.

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