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Securities (Amortized Cost and Fair Values of Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |
Available for Sale, Amortized Cost | $ 301,309 | $ 309,289 |
Available-for-sale Securities, Gross Unrealized Gains | 1,250 | 1,051 |
Available for Sale, Gross Unrealized Losses | (6,758) | (7,776) |
Available for Sale, Fair Value | 295,801 | 302,564 |
Pledged Financial Instruments, Not Separately Reported, Securities | 230,852 |  | $ 102,875
Total Debt Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available for Sale, Amortized Cost | 300,999 | 308,969 |
Available-for-sale Securities, Gross Unrealized Gains | 1,138 | 947 |
Available for Sale, Gross Unrealized Losses | (6,758) | (7,776) |
Available for Sale, Fair Value | 295,379 | 302,140 |
US Treasury Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available for Sale, Amortized Cost | 2,004 | 2,005 |
Available-for-sale Securities, Gross Unrealized Gains | 0 |  |
Available for Sale, Gross Unrealized Losses | (8) | (8) |
Available for Sale, Fair Value | 1,996 | 1,997 |
States and political subdivisions [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available for Sale, Amortized Cost | 126,756 | 127,585 |
Available-for-sale Securities, Gross Unrealized Gains | 1,071 | 884 |
Available for Sale, Gross Unrealized Losses | (2,627) | (3,368) |
Available for Sale, Fair Value | 125,200 | 125,101 |
Corporate obligations [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available for Sale, Amortized Cost | 10,208 | 10,255 |
Available-for-sale Securities, Gross Unrealized Gains | 41 | 37 |
Available for Sale, Gross Unrealized Losses | (142) | (180) |
Available for Sale, Fair Value | 10,107 | 10,112 |
Mortgage-backed securities-government sponsored entities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available for Sale, Amortized Cost | 162,031 | 169,124 |
Available-for-sale Securities, Gross Unrealized Gains | 26 | 26 |
Available for Sale, Gross Unrealized Losses | (3,981) | (4,220) |
Available for Sale, Fair Value | 158,076 | 164,930 |
Equity securities-financial services [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available for Sale, Amortized Cost | 310 | 320 |
Available-for-sale Securities, Gross Unrealized Gains | 112 | 104 |
Available for Sale, Gross Unrealized Losses | 0 | 0 |
Available for Sale, Fair Value | $ 422 | $ 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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