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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | $ 99,664 | $ 54,040
12 Months or less, Unrealized Loss | (1,634) | (336)
More than 12 months, Fair Value | 38,540 | 36,125
More than 12 months, Unrealized Loss | (1,159) | (718)
Total Fair Value | 138,204 | 90,165
Total Unrealized Loss | (2,793) | (1,054)
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 | 15,172 | 20,449
12 Months or less, Unrealized Loss | (159) | (100)
More than 12 months, Fair Value | 11,366 | 6,617
More than 12 months, Unrealized Loss | (135) | (92)
Total Fair Value | 26,538 | 27,066
Total Unrealized Loss | (294) | (192)
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 27,449 | 4,057
12 Months or less, Unrealized Loss | (448) | (41)
More than 12 months, Fair Value | 7,453 | 7,309
More than 12 months, Unrealized Loss | (253) | (131)
Total Fair Value | 34,902 | 11,366
Total Unrealized Loss | (701) | (172)
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 57,043 | 29,534
12 Months or less, Unrealized Loss | (1,027) | (195)
More than 12 months, Fair Value | 19,721 | 22,199
More than 12 months, Unrealized Loss | (771) | (495)
Total Fair Value | 76,764 | 51,733
Total Unrealized Loss | $ (1,798) | $ (690)

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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 No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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