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Recent Accounting Pronouncements (Impact of ASC 326 in Balance Sheet as January 1, 2020) (Details) - USD ($) $ in Thousands | Jan. 01, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
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Accounting Policies [Abstract] |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  | $ 3,225,232 |  | $ 3,081,973 |  |  |
Allowance for Credit Losses | $ (31,931) | (46,768) | $ (42,431) | (16,278) | $ (15,869) | $ (16,239) | $ (15,823)
Allowance for Credit Losses on Unfunded Loan Commitments | (173) |  |  |  |  |  |
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 |  |  |
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) |  |  |  |  |  |
Commercial and Industrial Loans |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | 534,692 | 781,547 |  | 589,758 |  |  |
Allowance for Credit Losses |  | (7,700) | (8,787) | (4,799) |  |  |
Commercial and Industrial Loans | Adjusted Balance |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  | 532,501 |  |  |
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 Real Estate Loans |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | 1,500,247 | 1,453,280 |  | 1,495,862 |  |  |
Allowance for Credit Losses |  | (28,382) | (22,369) | (4,692) | (4,300) | (5,841) | (5,291)
Commercial Real Estate Loans | Adjusted Balance |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  | 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 |  |  |  |  |  |
Agricultural Loans |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | 384,654 | 376,215 |  | 384,526 |  |  |
Allowance for Credit Losses |  | (6,715) | (7,030) | (5,315) | (5,352) | (5,725) | (5,776)
Agricultural Loans | Adjusted Balance |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  | 384,526 |  |  |
Agricultural Loans | Impact of ASC 326 Adoption |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | 128 |  |  |  |  |  |
Leases |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | 57,257 | 57,475 |  |  |  |  |
Allowance for Credit Losses |  | (206) | (202) | 0 |  |  |
Leases | Adjusted Balance |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  | 57,257 |  |  |
Leases | Impact of ASC 326 Adoption |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | 0 |  |  | 57,257 |  |  |
Home Equity Loans |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | 225,790 | 218,640 |  | 225,755 |  |  |
Allowance for Credit Losses |  | (995) | (1,062) | (200) | (194) | (258) | (229)
Home Equity Loans | Adjusted Balance |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  | 225,755 |  |  |
Home Equity Loans | Impact of ASC 326 Adoption |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | 35 |  |  |  |  |  |
Consumer Loans |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | 69,264 | 64,919 |  | 81,217 |  |  |
Allowance for Credit Losses |  | (492) | (496) | (434) | (418) | (422) | (420)
Consumer Loans | Adjusted Balance |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  | 69,264 |  |  |
Consumer Loans | Impact of ASC 326 Adoption |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | 0 |  |  | (11,953) |  |  |
Credit Cards |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | 11,953 | 10,717 |  |  |  |  |
Allowance for Credit Losses |  | (137) | (125) | 0 |  |  |
Credit Cards | Adjusted Balance |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  | 11,953 |  |  |
Credit Cards | Impact of ASC 326 Adoption |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | 0 |  |  | 11,953 |  |  |
Residential Mortgage Loans |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | 305,002 | 262,439 |  | 304,855 |  |  |
Allowance for Credit Losses |  | $ (2,141) | $ (2,360) | (333) | $ (362) | $ (349) | $ (472)
Residential Mortgage Loans | Adjusted Balance |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans |  |  |  | $ 304,855 |  |  |
Residential Mortgage Loans | Impact of ASC 326 Adoption |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Loans | $ 147 |  |  |  |  |  |

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