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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | $ 59,484 | $ 65,891
12 Months or less, Unrealized Loss | (593) | (1,185)
More than 12 months, Fair Value | 5,478 | 4,261
More than 12 months, Unrealized Loss | (131) | (63)
Total Fair Value | 64,962 | 70,152
Total Unrealized Loss | (724) | (1,248)
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 | 20,067 | 13,271
12 Months or less, Unrealized Loss | (73) | (61)
More than 12 months, Fair Value | 821 | 893
More than 12 months, Unrealized Loss | (12) | (16)
Total Fair Value | 20,888 | 14,164
Total Unrealized Loss | (85) | (77)
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 11,377 | 17,167
12 Months or less, Unrealized Loss | (188) | (558)
More than 12 months, Fair Value | 1,547 | 519
More than 12 months, Unrealized Loss | (67) | (16)
Total Fair Value | 12,924 | 17,686
Total Unrealized Loss | (255) | (574)
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 28,040 | 35,453
12 Months or less, Unrealized Loss | (332) | (566)
More than 12 months, Fair Value | 3,110 | 2,849
More than 12 months, Unrealized Loss | (52) | (31)
Total Fair Value | 31,150 | 38,302
Total Unrealized Loss | $ (384) | $ (597)

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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=82897076&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=82897076&loc=d3e27337-111563 + Details
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