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Investment Securities Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 212,366 | $ 181,380 | $ 189,033
Unrealized Gains | 4,065 | 4,567 | 3,947
Unrealized Losses | (498) | (686) | (2,060)
Fair Value (Estimated) | 215,933 | 185,261 | 190,920
Mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 184,865 | 149,796 | 157,420
Unrealized Gains | 2,921 | 2,637 | 2,109
Unrealized Losses | (276) | (578) | (1,779)
Fair Value (Estimated) | 187,510 | 151,855 | 157,750
State and political subdivisions |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 24,372 | 29,094 | 29,099
Unrealized Gains | 1,104 | 1,865 | 1,785
Unrealized Losses | (186) | (104) | (265)
Fair Value (Estimated) | 25,290 | 30,855 | 30,619
Other equity securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 3,129 | 2,490 | 2,514
Unrealized Gains | 40 | 65 | 53
Unrealized Losses | (36) | (4) | (16)
Fair Value (Estimated) | $ 3,133 | $ 2,551 | $ 2,551

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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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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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