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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | $ 54,040 | $ 65,891
12 Months or less, Unrealized Loss | (336) | (1,185)
More than 12 months, Fair Value | 36,125 | 4,261
More than 12 months, Unrealized Loss | (718) | (63)
Total Fair Value | 90,165 | 70,152
Total Unrealized Loss | (1,054) | (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 | 20,449 | 13,271
12 Months or less, Unrealized Loss | (100) | (61)
More than 12 months, Fair Value | 6,617 | 893
More than 12 months, Unrealized Loss | (92) | (16)
Total Fair Value | 27,066 | 14,164
Total Unrealized Loss | (192) | (77)
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 4,057 | 17,167
12 Months or less, Unrealized Loss | (41) | (558)
More than 12 months, Fair Value | 7,309 | 519
More than 12 months, Unrealized Loss | (131) | (16)
Total Fair Value | 11,366 | 17,686
Total Unrealized Loss | (172) | (574)
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 29,534 | 35,453
12 Months or less, Unrealized Loss | (195) | (566)
More than 12 months, Fair Value | 22,199 | 2,849
More than 12 months, Unrealized Loss | (495) | (31)
Total Fair Value | 51,733 | 38,302
Total Unrealized Loss | $ (690) | $ (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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