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Summary of Significant Accounting Policies (Impact of ASC 326 in Loan Portfolio Segments as January 1, 2020) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans | $ 3,091,998 |  | $ 3,081,973
Commercial and Industrial Loans |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans | 638,773 | $ 534,692 | 589,758
Commercial Real Estate Loans |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans | 1,467,397 | 1,500,247 | 1,495,862
Agricultural Loans |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans | 376,186 | 384,654 | 384,526
Leases |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans | 55,664 | 57,257 |
Home Equity Loans |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans | 219,348 | 225,790 | 225,755
Consumer Loans |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans | 66,717 | 69,264 | 81,217
Credit Cards |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans | 11,637 | 11,953 |
Residential Mortgage Loans |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans | $ 256,276 | 305,002 | 304,855
Impact of ASC 326 Adoption |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans |  |  | 0
Impact of ASC 326 Adoption | Commercial and Industrial Loans |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans |  | 2,191 | (57,257)
Impact of ASC 326 Adoption | Commercial Real Estate Loans |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans |  | 4,385 |
Impact of ASC 326 Adoption | Agricultural Loans |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans |  | 128 |
Impact of ASC 326 Adoption | Leases |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans |  | 0 | 57,257
Impact of ASC 326 Adoption | Home Equity Loans |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans |  | 35 |
Impact of ASC 326 Adoption | Consumer Loans |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans |  | 0 | (11,953)
Impact of ASC 326 Adoption | Credit Cards |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans |  | 0 | 11,953
Impact of ASC 326 Adoption | Residential Mortgage Loans |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans |  | $ 147 |
Adjusted Balance |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans |  |  | 3,081,973
Adjusted Balance | Commercial and Industrial Loans |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans |  |  | 532,501
Adjusted Balance | Commercial Real Estate Loans |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans |  |  | 1,495,862
Adjusted Balance | Agricultural Loans |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans |  |  | 384,526
Adjusted Balance | Leases |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans |  |  | 57,257
Adjusted Balance | Home Equity Loans |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans |  |  | 225,755
Adjusted Balance | Consumer Loans |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans |  |  | 69,264
Adjusted Balance | Credit Cards |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans |  |  | 11,953
Adjusted Balance | Residential Mortgage Loans |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans |  |  | $ 304,855

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