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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | $ 16,059 | $ 20,806
12 Months or less, Unrealized Loss | (130) | (57)
More than 12 months, Fair Value | 10,307 | 29,027
More than 12 months, Unrealized Loss | (100) | (552)
Total Fair Value | 26,366 | 49,833
Total Unrealized Loss | (230) | (609)
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 2,037 | 7,664
12 Months or less, Unrealized Loss |  | (17)
More than 12 months, Fair Value | 1,192 | 11,888
More than 12 months, Unrealized Loss | (13) | (106)
Total Fair Value | 3,229 | 19,552
Total Unrealized Loss | (13) | (123)
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 7,866 | 853
12 Months or less, Unrealized Loss | (93) | (11)
More than 12 months, Fair Value | 1,466 | 5,647
More than 12 months, Unrealized Loss | (50) | (295)
Total Fair Value | 9,332 | 6,500
Total Unrealized Loss | (143) | (306)
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 6,156 | 12,289
12 Months or less, Unrealized Loss | (37) | (29)
More than 12 months, Fair Value | 7,649 | 11,492
More than 12 months, Unrealized Loss | (37) | (151)
Total Fair Value | 13,805 | 23,781
Total Unrealized Loss | $ (74) | $ (180)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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