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Loans - Components of Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 4,044,268 |  | $ 3,977,900 |  |  |
Less: Unearned Income | (7,141) |  | (6,818) |  |  |
Allowance for Credit Losses | (43,946) | $ (43,754) | (43,765) | $ (44,266) | $ (44,315) | $ (44,168)
Loans, Net | 3,993,181 |  | 3,927,317 |  |  |
Commercial and Industrial Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | 591,699 |  | 589,541 |  |  |
Allowance for Credit Losses | (7,200) | (7,266) | (7,921) | (13,567) | (13,572) | (13,749)
Commercial Real Estate Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | 2,172,447 |  | 2,121,835 |  |  |
Allowance for Credit Losses | (26,598) | (26,452) | (25,923) | (21,834) | (22,062) | (21,598)
Agricultural Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | 413,742 |  | 423,803 |  |  |
Allowance for Credit Losses | (3,697) | (3,650) | (3,837) | (3,956) | (3,887) | (4,188)
Leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | 72,736 |  | 71,988 |  |  |
Allowance for Credit Losses | (368) | (373) | (346) | (235) | (227) | (209)
Home Equity Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | 322,043 |  | 299,685 |  |  |
Allowance for Credit Losses | (2,058) | (2,001) | (1,834) | (1,436) | (1,415) | (1,344)
Consumer Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | 81,171 |  | 87,853 |  |  |
Allowance for Credit Losses | (722) | (785) | (759) | (640) | (609) | (595)
Credit Cards |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | 21,433 |  | 20,351 |  |  |
Allowance for Credit Losses | (413) | (395) | (383) | (288) | (263) | (257)
Residential Mortgage Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | 368,997 |  | 362,844 |  |  |
Allowance for Credit Losses | (2,890) | $ (2,832) | (2,762) | $ (2,310) | $ (2,280) | $ (2,228)
Commercial: | Commercial and Industrial Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | 591,699 |  | 589,541 |  |  |
Commercial: | Commercial Real Estate Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | 2,172,447 |  | 2,121,835 |  |  |
Commercial: | Agricultural Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | 413,742 |  | 423,803 |  |  |
Commercial: | Leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | 72,736 |  | 71,988 |  |  |
Retail: | Home Equity Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | 322,043 |  | 299,685 |  |  |
Retail: | Consumer Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | 81,171 |  | 87,853 |  |  |
Retail: | Credit Cards |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | 21,433 |  | 20,351 |  |  |
Retail: | Residential Mortgage Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 368,997 |  | $ 362,844 |  |  |

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