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Loans (Components of Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | $ 3,225,232 |  |  | $ 3,081,973 |  |  |
Less: Unearned Income | (4,105) |  |  | (4,882) |  |  |
Allowance for credit losses | (46,768) | $ (42,431) | $ (31,931) | (16,278) | $ (15,869) | $ (16,239) | $ (15,823)
Loans, Net | 3,174,359 |  |  | 3,060,813 |  |  |
Commercial and Industrial Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 781,547 |  | 534,692 | 589,758 |  |  |
Allowance for credit losses | (7,700) | (8,787) |  | (4,799) |  |  |
Commercial Real Estate Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 1,453,280 |  | 1,500,247 | 1,495,862 |  |  |
Allowance for credit losses | (28,382) | (22,369) |  | (4,692) | (4,300) | (5,841) | (5,291)
Agricultural Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 376,215 |  | 384,654 | 384,526 |  |  |
Allowance for credit losses | (6,715) | (7,030) |  | (5,315) | (5,352) | (5,725) | (5,776)
Leases |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 57,475 |  | 57,257 |  |  |  |
Allowance for credit losses | (206) | (202) |  | 0 |  |  |
Home Equity Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 218,640 |  | 225,790 | 225,755 |  |  |
Allowance for credit losses | (995) | (1,062) |  | (200) | (194) | (258) | (229)
Consumer Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 64,919 |  | 69,264 | 81,217 |  |  |
Allowance for credit losses | (492) | (496) |  | (434) | (418) | (422) | (420)
Credit Cards |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 10,717 |  | 11,953 |  |  |  |
Allowance for credit losses | (137) | (125) |  | 0 |  |  |
Residential Mortgage Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 262,439 |  | $ 305,002 | 304,855 |  |  |
Allowance for credit losses | (2,141) | $ (2,360) |  | (333) | $ (362) | $ (349) | $ (472)
Commercial | Commercial and Industrial Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 781,547 |  |  | 532,501 |  |  |
Commercial | Commercial Real Estate Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 1,453,280 |  |  | 1,495,862 |  |  |
Commercial | Agricultural Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 376,215 |  |  | 384,526 |  |  |
Commercial | Leases |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 57,475 |  |  | 57,257 |  |  |
Retail | Home Equity Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 218,640 |  |  | 225,755 |  |  |
Retail | Consumer Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 64,919 |  |  | 69,264 |  |  |
Retail | Credit Cards |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 10,717 |  |  | 11,953 |  |  |
Retail | Residential Mortgage Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | $ 262,439 |  |  | $ 304,855 |  |  |

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