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Securities (Schedule Of Amortized Cost Gross Unrealized Gains and Losses, and Fair Values of Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
--- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |
Available for Sale, Gross Unrealized Gains | $ 0 |  |
Available for Sale, Gross Unrealized Losses | 0 | $ 0 |
Available for Sale, Fair Value | 265,862 | 281,121 |
Pledged Financial Instruments, Not Separately Reported, Securities | 216,435 |  | $ 230,852
Total Debt Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available for Sale, Amortized Cost | 274,343 | 284,970 |
Available for Sale, Gross Unrealized Gains | 649 | 1,568 |
Available for Sale, Gross Unrealized Losses | (9,130) | (5,417) |
Available for Sale, Fair Value | 265,862 | 281,121 |
US Treasury Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available for Sale, Amortized Cost |  | 2,001 |
Available for Sale, Gross Unrealized Losses |  | (3) |
Available for Sale, Fair Value |  | 1,998 |
States and Political Subdivisions [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available for Sale, Amortized Cost | 108,850 | 120,000 |
Available for Sale, Gross Unrealized Gains | 628 | 1,535 |
Available for Sale, Gross Unrealized Losses | (2,587) | (1,057) |
Available for Sale, Fair Value | 106,891 | 120,478 |
Corporate Obligations [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available for Sale, Amortized Cost | 10,020 | 10,068 |
Available for Sale, Gross Unrealized Gains | 0 | 16 |
Available for Sale, Gross Unrealized Losses | (253) | (95) |
Available for Sale, Fair Value | 9,767 | 9,989 |
Mortgage-backed Securities-Government Sponsored Entities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available for Sale, Amortized Cost | 155,473 | 152,901 |
Available for Sale, Gross Unrealized Gains | 21 | 17 |
Available for Sale, Gross Unrealized Losses | (6,290) | (4,262) |
Available for Sale, Fair Value | $ 149,204 | $ 148,656 |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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