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Loans (Components of Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | $ 3,012,989 |  | $ 3,091,998 |  |  |  | $ 3,081,973
Less: Unearned Income | (3,729) |  | (3,926) |  |  |  |
Allowance for Credit Losses | (37,798) | $ (39,995) | (46,859) | $ (46,768) | $ (42,431) | $ (31,931) | (16,278)
Loans, Net | 2,971,462 |  | 3,041,213 |  |  |  |
Commercial and Industrial Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 510,583 |  | 638,773 |  |  | 534,692 | 589,758
Allowance for Credit Losses | (8,054) | (6,080) | (6,445) | (7,700) | (8,787) |  | (4,799)
Commercial Real Estate Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 1,528,493 |  | 1,467,397 |  |  | 1,500,247 | 1,495,862
Allowance for Credit Losses | (21,392) | (24,220) | (29,878) | (28,382) | (22,369) |  | (4,692)
Agricultural Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 349,321 |  | 376,186 |  |  | 384,654 | 384,526
Allowance for Credit Losses | (4,695) | (5,847) | (6,756) | (6,715) | (7,030) |  | (5,315)
Leases |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 56,186 |  | 55,664 |  |  | 57,257 |
Allowance for Credit Losses | (203) | (204) | (200) | (206) | (202) |  | 0
Home Equity Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 217,994 |  | 219,348 |  |  | 225,790 | 225,755
Allowance for Credit Losses | (1,017) | (908) | (996) | (995) | (1,062) |  | (200)
Consumer Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 67,150 |  | 66,717 |  |  | 69,264 | 81,217
Allowance for Credit Losses | (483) | (460) | (490) | (492) | (496) |  | (434)
Credit Cards |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 13,856 |  | 11,637 |  |  | 11,953 |
Allowance for Credit Losses | (192) | (181) | (150) | (137) | (125) |  | 0
Residential Mortgage Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 269,406 |  | 256,276 |  |  | $ 305,002 | 304,855
Allowance for Credit Losses | (1,762) | $ (2,095) | (1,944) | $ (2,141) | $ (2,360) |  | $ (333)
Commercial | Commercial and Industrial Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 510,583 |  | 638,773 |  |  |  |
Commercial | Commercial Real Estate Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 1,528,493 |  | 1,467,397 |  |  |  |
Commercial | Agricultural Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 349,321 |  | 376,186 |  |  |  |
Commercial | Leases |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 56,186 |  | 55,664 |  |  |  |
Retail | Home Equity Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 217,994 |  | 219,348 |  |  |  |
Retail | Consumer Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 67,150 |  | 66,717 |  |  |  |
Retail | Credit Cards |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | 13,856 |  | 11,637 |  |  |  |
Retail | Residential Mortgage Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total | $ 269,406 |  | $ 256,276 |  |  |  |

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