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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ (759) | $ (625)
Fair Value, Less Than Twelve Months | 44,917 | 66,400
Gross Unrealized Losses, Twelve Months and Over | (5,660) | (2,643)
Fair Value, Twelve Months and Over | 129,282 | 106,840
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (111) | (36)
Fair Value, Less Than Twelve Months | 6,860 | 6,924
Gross Unrealized Losses, Twelve Months and Over | (259) | (205)
Fair Value, Twelve Months and Over | 13,910 | 14,054
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (166) | (314)
Fair Value, Less Than Twelve Months | 7,424 | 27,328
Gross Unrealized Losses, Twelve Months and Over | (2,820) | (1,418)
Fair Value, Twelve Months and Over | 68,344 | 53,139
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (132) | (70)
Fair Value, Less Than Twelve Months | 7,220 | 7,149
Gross Unrealized Losses, Twelve Months and Over | (1,629) | (720)
Fair Value, Twelve Months and Over | 26,657 | 28,080
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (350) | (205)
Fair Value, Less Than Twelve Months | 23,413 | 24,999
Gross Unrealized Losses, Twelve Months and Over | (952) | (300)
Fair Value, Twelve Months and Over | $ 20,371 | $ 11,567

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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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