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Securities (Amortized Cost and Fair Values of Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016
--- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |
Available for Sale, Amortized Cost | $ 303,470 | $ 309,289 |
Available-for-sale Securities, Gross Unrealized Gains | 1,725 | 1,051 |
Available for Sale, Gross Unrealized Losses | (4,528) | (7,776) |
Available for Sale, Fair Value | 300,667 | 302,564 |
Pledged Financial Instruments, Not Separately Reported, Securities | 226,759 |  | $ 110,266
Total Debt Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available for Sale, Amortized Cost | 303,178 | 308,969 |
Available-for-sale Securities, Gross Unrealized Gains | 1,591 | 947 |
Available for Sale, Gross Unrealized Losses | (4,528) | (7,776) |
Available for Sale, Fair Value | 300,241 | 302,140 |
US Treasury Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available for Sale, Amortized Cost | 2,003 | 2,005 |
Available-for-sale Securities, Gross Unrealized Gains | 0 |  |
Available for Sale, Gross Unrealized Losses | (9) | (8) |
Available for Sale, Fair Value | 1,994 | 1,997 |
States and political subdivisions [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available for Sale, Amortized Cost | 128,343 | 127,585 |
Available-for-sale Securities, Gross Unrealized Gains | 1,510 | 884 |
Available for Sale, Gross Unrealized Losses | (1,215) | (3,368) |
Available for Sale, Fair Value | 128,638 | 125,101 |
Corporate obligations [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available for Sale, Amortized Cost | 10,162 | 10,255 |
Available-for-sale Securities, Gross Unrealized Gains | 44 | 37 |
Available for Sale, Gross Unrealized Losses | (92) | (180) |
Available for Sale, Fair Value | 10,114 | 10,112 |
Mortgage-backed securities-government sponsored entities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available for Sale, Amortized Cost | 162,670 | 169,124 |
Available-for-sale Securities, Gross Unrealized Gains | 37 | 26 |
Available for Sale, Gross Unrealized Losses | (3,212) | (4,220) |
Available for Sale, Fair Value | 159,495 | 164,930 |
Equity securities-financial services [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available for Sale, Amortized Cost | 292 | 320 |
Available-for-sale Securities, Gross Unrealized Gains | 134 | 104 |
Available for Sale, Gross Unrealized Losses | 0 | 0 |
Available for Sale, Fair Value | $ 426 | $ 424 |

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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=65884222&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=73527792&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=66010992&loc=d3e26610-111562 + Details
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