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Summary of Significant Accounting Policies (Impact of ASC 326 in Balance Sheet as January 1, 2020) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Loans | $ 3,091,998 |  | $ 3,081,973 |  |
Allowance for Credit Losses | (46,859) | $ (31,931) | (16,278) | $ (15,823) | $ (15,694)
Allowance for Credit Losses on Unfunded Loan Commitments |  | (173) |  |  |
Commercial and Industrial Loans |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Loans | 638,773 | 534,692 | 589,758 |  |
Allowance for Credit Losses | (6,445) |  | (4,799) |  |
Commercial Real Estate Loans |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Loans | 1,467,397 | 1,500,247 | 1,495,862 |  |
Allowance for Credit Losses | (29,878) |  | (4,692) | (5,291) | (4,591)
Agricultural Loans |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Loans | 376,186 | 384,654 | 384,526 |  |
Allowance for Credit Losses | (6,756) |  | (5,315) | (5,776) | (4,894)
Leases |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Loans | 55,664 | 57,257 |  |  |
Allowance for Credit Losses | (200) |  | 0 |  |
Home Equity Loans |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Loans | 219,348 | 225,790 | 225,755 |  |
Allowance for Credit Losses | (996) |  | (200) | (229) | (330)
Consumer Loans |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Loans | 66,717 | 69,264 | 81,217 |  |
Allowance for Credit Losses | (490) |  | (434) | (420) | (298)
Credit Cards |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Loans | 11,637 | 11,953 |  |  |
Allowance for Credit Losses | (150) |  | 0 |  |
Residential Mortgage Loans |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Loans | 256,276 | 305,002 | 304,855 |  |
Allowance for Credit Losses | $ (1,944) |  | (333) | $ (472) | $ (343)
Adjusted Balance |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Loans |  |  | 3,081,973 |  |
Allowance for Credit Losses |  |  | (16,278) |  |
Allowance for Credit Losses on Unfunded Loan Commitments |  |  | 0 |  |
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 |  |
Impact of ASC 326 Adoption |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Loans |  |  | 0 |  |
Allowance for Credit Losses |  | (15,653) |  |  |
Allowance for Credit Losses on Unfunded Loan Commitments |  | (173) |  |  |
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 |  |  |

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