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Recent Accounting Pronouncements (Impact of ASC 326 in Loan Portfolio Segments as January 1, 2020) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans | $ 3,120,981 | $ 3,091,998 |  | $ 3,081,973
Impact of ASC 326 Adoption |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  |  |  | 0
December 31, 2019 After Reclassification |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  |  |  | 3,081,973
Commercial and Industrial Loans |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans | 672,300 | 638,773 | $ 534,692 | 589,758
Commercial and Industrial Loans | Impact of ASC 326 Adoption |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  |  | 2,191 | (57,257)
Commercial and Industrial Loans | December 31, 2019 After Reclassification |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  |  |  | 532,501
Commercial Real Estate Loans |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans | 1,492,617 | 1,467,397 | 1,500,247 | 1,495,862
Commercial Real Estate Loans | Impact of ASC 326 Adoption |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  |  | 4,385 |
Commercial Real Estate Loans | December 31, 2019 After Reclassification |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  |  |  | 1,495,862
Agricultural Loans |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans | 347,231 | 376,186 | 384,654 | 384,526
Agricultural Loans | Impact of ASC 326 Adoption |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  |  | 128 |
Agricultural Loans | December 31, 2019 After Reclassification |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  |  |  | 384,526
Leases |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans | 55,714 | 55,664 | 57,257 |
Leases | Impact of ASC 326 Adoption |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  |  | 0 | 57,257
Leases | December 31, 2019 After Reclassification |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  |  |  | 57,257
Home Equity Loans |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans | 212,306 | 219,348 | 225,790 | 225,755
Home Equity Loans | Impact of ASC 326 Adoption |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  |  | 35 |
Home Equity Loans | December 31, 2019 After Reclassification |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  |  |  | 225,755
Consumer Loans |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans | 60,570 | 66,717 | 69,264 | 81,217
Consumer Loans | Impact of ASC 326 Adoption |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  |  | 0 | (11,953)
Consumer Loans | December 31, 2019 After Reclassification |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  |  |  | 69,264
Credit Cards |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans | 12,609 | 11,637 | 11,953 |
Credit Cards | Impact of ASC 326 Adoption |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  |  | 0 | 11,953
Credit Cards | December 31, 2019 After Reclassification |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  |  |  | 11,953
Residential Mortgage Loans |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans | $ 267,634 | $ 256,276 | 305,002 | 304,855
Residential Mortgage Loans | Impact of ASC 326 Adoption |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  |  | $ 147 |
Residential Mortgage Loans | December 31, 2019 After Reclassification |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  |  |  | $ 304,855

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