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Loans And Allowance For Loan Losses (Summary Of Troubled Debt Restructures) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) loan | Dec. 31, 2015 USD ($) loan | Dec. 31, 2014 USD ($) loan
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | loan | 13 | 10 | 2
Pre-Modification Outstanding Recorded Investment | $ 1,537 | $ 1,795 | $ 130
Post-Modification Outstanding Recorded Investment | $ 1,457 | $ 1,800 | $ 127
Commercial [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | loan | 6 | 4 | 1
Pre-Modification Outstanding Recorded Investment | $ 1,459 | $ 342 | $ 30
Post-Modification Outstanding Recorded Investment | $ 1,354 | $ 352 | $ 30
Commercial And Industrial [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | loan | 2 |  |
Pre-Modification Outstanding Recorded Investment | $ 38 |  |
Post-Modification Outstanding Recorded Investment | $ 48 |  |
Agriculture And Other Loans To Farmers [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | loan | 3 | 1 | 1
Pre-Modification Outstanding Recorded Investment | $ 29 | $ 18 | $ 100
Post-Modification Outstanding Recorded Investment | $ 44 | $ 15 | $ 97
Commercial Loans [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | loan | 11 | 5 | 2
Pre-Modification Outstanding Recorded Investment | $ 1,526 | $ 360 | $ 130
Post-Modification Outstanding Recorded Investment | $ 1,446 | $ 367 | $ 127
Other Consumer [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | loan | 2 | 5 |
Pre-Modification Outstanding Recorded Investment | $ 11 | $ 1,435 |
Post-Modification Outstanding Recorded Investment | $ 11 | $ 1,433 |
Consumer Loans [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | loan | 2 | 5 |
Pre-Modification Outstanding Recorded Investment | $ 11 | $ 1,435 |
Post-Modification Outstanding Recorded Investment | $ 11 | $ 1,433 |

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524 + Details
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