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Investment Securities Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 235,174 | $ 221,311 | $ 212,294
Unrealized Gains | 6,422 | 2,758 | 3,107
Unrealized Losses | (269) | (1,030) | (1,587)
Fair Value (Estimated) | 241,327 | 223,039 | 213,814
U.S. Government-sponsored agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 522 |  |
Unrealized Gains | 0 |  |
Unrealized Losses | 0 |  |
Fair Value (Estimated) | 522 |  |
Mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 214,303 | 194,563 | 184,787
Unrealized Gains | 5,274 | 1,509 | 2,040
Unrealized Losses | (224) | (962) | (1,235)
Fair Value (Estimated) | 219,353 | 195,110 | 185,592
State and political subdivisions |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 17,315 | 23,367 | 24,378
Unrealized Gains | 1,100 | 1,201 | 1,006
Unrealized Losses | 0 | (62) | (344)
Fair Value (Estimated) | 18,415 | 24,506 | 25,040
Other equity securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 3,034 | 3,381 | 3,129
Unrealized Gains | 48 | 48 | 61
Unrealized Losses | (45) | (6) | (8)
Fair Value (Estimated) | $ 3,037 | $ 3,423 | $ 3,182

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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=73527792&loc=d3e27161-111563 + Details
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