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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | $ 125,249 | $ 54,040
12 Months or less, Unrealized Loss | (1,788) | (336)
More than 12 months, Fair Value | 54,366 | 36,125
More than 12 months, Unrealized Loss | (1,681) | (718)
Total Fair Value | 179,615 | 90,165
Total Unrealized Loss | (3,469) | (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 | 7,156 | 20,449
12 Months or less, Unrealized Loss | (107) | (100)
More than 12 months, Fair Value | 13,774 | 6,617
More than 12 months, Unrealized Loss | (126) | (92)
Total Fair Value | 20,930 | 27,066
Total Unrealized Loss | (233) | (192)
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 58,768 | 4,057
12 Months or less, Unrealized Loss | (967) | (41)
More than 12 months, Fair Value | 7,374 | 7,309
More than 12 months, Unrealized Loss | (310) | (131)
Total Fair Value | 66,142 | 11,366
Total Unrealized Loss | (1,277) | (172)
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 59,325 | 29,534
12 Months or less, Unrealized Loss | (714) | (195)
More than 12 months, Fair Value | 33,218 | 22,199
More than 12 months, Unrealized Loss | (1,245) | (495)
Total Fair Value | 92,543 | 51,733
Total Unrealized Loss | $ (1,959) | $ (690)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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