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Loans (Aging on Recorded Investment of Past Due Loans) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |  |
Total | [1] |  | $ 3,095,902 |
Total Past Due |  | $ 20,489 | 19,974 | [1]
Loans Not Past Due |  | 3,071,509 | 3,075,928 | [1]
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 |  | 5,219 | 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 |  | 7,545 | 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 |  | 7,725 | 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 |  | 8,564 | 2,746 |
Loans Not Past Due |  | 1,458,833 | 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 |  | 5 | 209 |
Commercial Real Estate Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 4,877 | 431 |
Commercial Real Estate Loans | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 3,682 | 2,106 |
Agricultural Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total | [1] |  | 390,871 |
Total Past Due |  | 651 | 828 |
Loans Not Past Due |  | 375,535 | 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 |  | 0 | 0 |
Agricultural Loans | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 651 | 329 |
Home Equity Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total | [1] |  | 226,775 |
Total Past Due |  | 948 | 1,454 |
Loans Not Past Due |  | 218,400 | 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 |  | 672 | 1,121 |
Home Equity Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 5 | 253 |
Home Equity Loans | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 271 | 80 |
Consumer Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total | [1] |  | 81,429 |
Total Past Due |  | 382 | 592 |
Loans Not Past Due |  | 66,335 | 80,837 |
Consumer Loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 233 | 347 |
Consumer Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 84 | 156 |
Consumer Loans | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 65 | 89 |
Residential Mortgage Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total | [1] |  | 305,560 |
Total Past Due |  | 5,856 | 8,783 |
Loans Not Past Due |  | 250,420 | 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 |  | 3,737 | 5,014 |
Residential Mortgage Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | 1,590 | 1,461 |
Residential Mortgage Loans | Greater Than 89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Past Due |  | $ 529 | $ 2,308 |
[1] | Total recorded investment in loans includes $13,929 in accrued interest.

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