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Investment Securities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
ScheduleOfAvailableForSaleSecuritiesLineItems |  |
Available-for-sale securities, Amortized Cost | $ 219,081 | $ 235,579
Available-for-sale securities, Gross Unrealized Gains | 1,876 | 1,328
Available-for-sale securities, Gross Unrealized Losses | 523 | 799
Available-for-sale securities, Estimated Fair Value | 220,434 | 236,108
Held-to-maturity securities, Amortized Cost | 4,192 | 4,630
Held-to-maturity securities, Gross Unrealized Gains | 131 | 147
Held-to-maturity securities, Gross Unrealized Losses | 43 | 83
Held-to-maturity securities, Estimated Fair Value | 4,280 | 4,694
US Treasury Securities [Member] |  |
ScheduleOfAvailableForSaleSecuritiesLineItems |  |
Available-for-sale securities, Amortized Cost | 5,111 | 5,210
Available-for-sale securities, Gross Unrealized Gains | 12 | 5
Available-for-sale securities, Gross Unrealized Losses | 0 | 0
Available-for-sale securities, Estimated Fair Value | 5,123 | 5,215
US Government Corporations and Agencies Securities [Member] |  |
ScheduleOfAvailableForSaleSecuritiesLineItems |  |
Available-for-sale securities, Amortized Cost | 65,707 | 75,220
Available-for-sale securities, Gross Unrealized Gains | 207 | 87
Available-for-sale securities, Gross Unrealized Losses | 160 | 347
Available-for-sale securities, Estimated Fair Value | 65,754 | 74,960
Held-to-maturity securities, Amortized Cost | 2,575 | 2,791
Held-to-maturity securities, Gross Unrealized Gains | 0 | 0
Held-to-maturity securities, Gross Unrealized Losses | 43 | 83
Held-to-maturity securities, Estimated Fair Value | 2,532 | 2,708
US States and Political Subdivisions Debt Securities [Member] |  |
ScheduleOfAvailableForSaleSecuritiesLineItems |  |
Held-to-maturity securities, Amortized Cost | 1,617 | 1,839
Held-to-maturity securities, Gross Unrealized Gains | 131 | 147
Held-to-maturity securities, Gross Unrealized Losses | 0 | 0
Held-to-maturity securities, Estimated Fair Value | 1,748 | 1,986
Collateralized Mortgage Backed Securities [Member] |  |
ScheduleOfAvailableForSaleSecuritiesLineItems |  |
Available-for-sale securities, Amortized Cost | 147,629 | 154,525
Available-for-sale securities, Gross Unrealized Gains | 1,647 | 1,230
Available-for-sale securities, Gross Unrealized Losses | 363 | 452
Available-for-sale securities, Estimated Fair Value | 148,913 | 155,303
Equity Securities [Member] |  |
ScheduleOfAvailableForSaleSecuritiesLineItems |  |
Available-for-sale securities, Amortized Cost | 634 | 624
Available-for-sale securities, Gross Unrealized Gains | 10 | 6
Available-for-sale securities, Gross Unrealized Losses | 0 | 0
Available-for-sale securities, Estimated Fair Value | 644 | $ 630
Held-to-maturity securities, Amortized Cost | 0 |
Held-to-maturity securities, Estimated Fair Value | $ 0 |

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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=51813488&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=27724398&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=49167202&loc=d3e26610-111562 + Details
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