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Investment Securities Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014 | Jun. 30, 2014
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 212,294 | $ 181,380 | $ 301,501
Unrealized Gains | 3,107 | 4,567 | 6,455
Unrealized Losses | (1,587) | (686) | (4,076)
Fair Value (Estimated) | 213,814 | 185,261 | 303,880
Mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 184,787 | 149,796 | 165,978
Unrealized Gains | 2,040 | 2,637 | 2,417
Unrealized Losses | (1,235) | (578) | (1,692)
Fair Value (Estimated) | 185,592 | 151,855 | 166,703
State and political subdivisions |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 24,378 | 29,094 | 133,327
Unrealized Gains | 1,006 | 1,865 | 3,951
Unrealized Losses | (344) | (104) | (2,383)
Fair Value (Estimated) | 25,040 | 30,855 | 134,895
Other equity securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 3,129 | 2,490 | 2,196
Unrealized Gains | 61 | 65 | 87
Unrealized Losses | (8) | (4) | (1)
Fair Value (Estimated) | $ 3,182 | $ 2,551 | $ 2,282

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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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