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Investment Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
ScheduleOfAvailableForSaleSecuritiesLineItems |  |
Available-for-sale securities, Amortized Cost | $ 205,266 | $ 212,284
Available-for-sale securities, Gross Unrealized Gains | 1,892 | 733
Available-for-sale securities, Gross Unrealized Losses | 423 | 852
Available-for-sale securities, Estimated Fair Value | 206,735 | 212,165
Held-to-maturity securities, Amortized Cost | 3,996 | 4,191
Held-to-maturity securities, Gross Unrealized Gains | 121 | 112
Held-to-maturity securities, Gross Unrealized Losses | 9 | 60
Held-to-maturity securities, Estimated Fair Value | 4,108 | 4,243
US Treasury Securities [Member] |  |
ScheduleOfAvailableForSaleSecuritiesLineItems |  |
Available-for-sale securities, Amortized Cost | 5,045 | 5,078
Available-for-sale securities, Gross Unrealized Gains | 5 | 1
Available-for-sale securities, Gross Unrealized Losses | 0 | 0
Available-for-sale securities, Estimated Fair Value | 5,050 | 5,079
US Government Corporations and Agencies Securities [Member] |  |
ScheduleOfAvailableForSaleSecuritiesLineItems |  |
Available-for-sale securities, Amortized Cost | 49,490 | 49,630
Available-for-sale securities, Gross Unrealized Gains | 163 | 89
Available-for-sale securities, Gross Unrealized Losses | 145 | 190
Available-for-sale securities, Estimated Fair Value | 49,508 | 49,529
Held-to-maturity securities, Amortized Cost | 2,380 | 2,575
Held-to-maturity securities, Gross Unrealized Gains | 0 | 0
Held-to-maturity securities, Gross Unrealized Losses | 9 | 60
Held-to-maturity securities, Estimated Fair Value | 2,371 | 2,515
US States and Political Subdivisions Debt Securities [Member] |  |
ScheduleOfAvailableForSaleSecuritiesLineItems |  |
Held-to-maturity securities, Amortized Cost | 1,616 | 1,616
Held-to-maturity securities, Gross Unrealized Gains | 121 | 112
Held-to-maturity securities, Gross Unrealized Losses | 0 | 0
Held-to-maturity securities, Estimated Fair Value | 1,737 | 1,728
Collateralized Mortgage Backed Securities [Member] |  |
ScheduleOfAvailableForSaleSecuritiesLineItems |  |
Available-for-sale securities, Amortized Cost | 150,090 | 156,939
Available-for-sale securities, Gross Unrealized Gains | 1,713 | 639
Available-for-sale securities, Gross Unrealized Losses | 278 | 662
Available-for-sale securities, Estimated Fair Value | 151,525 | 156,916
Equity Securities [Member] |  |
ScheduleOfAvailableForSaleSecuritiesLineItems |  |
Available-for-sale securities, Amortized Cost | 641 | 637
Available-for-sale securities, Gross Unrealized Gains | 11 | 4
Available-for-sale securities, Gross Unrealized Losses | 0 | 0
Available-for-sale securities, Estimated Fair Value | 652 | $ 641
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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