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Recent Accounting Pronouncements (Impact of ASC 326 in Loan Portfolio Segments as January 1, 2020) (Details) - USD ($) $ in Thousands | Jan. 01, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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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 |  | $ 3,270,934 | $ 3,081,973
Impact of ASC 326 Adoption |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans |  |  | 0
Adjusted Balance |  |  |
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 | $ 534,692 | 795,688 | 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 | Adjusted Balance |  |  |
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 | 1,500,247 | 1,473,234 | 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 | Adjusted Balance |  |  |
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 | 384,654 | 373,483 | 384,526
Agricultural Loans | Impact of ASC 326 Adoption |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans | 128 |  |
Agricultural Loans | Adjusted Balance |  |  |
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 | 57,257 | 56,728 |
Leases | Impact of ASC 326 Adoption |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans | 0 |  | 57,257
Leases | Adjusted Balance |  |  |
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 | 225,790 | 216,366 | 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 | Adjusted Balance |  |  |
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 | 69,264 | 64,972 | 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 | Adjusted Balance |  |  |
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 | 11,953 | 10,217 |
Credit Cards | Impact of ASC 326 Adoption |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans | 0 |  | 11,953
Credit Cards | Adjusted Balance |  |  |
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 | 305,002 | $ 280,246 | 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 | Adjusted Balance |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Loans |  |  | $ 304,855

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