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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ (1,139) | $ (625)
Fair Value, Less Than Twelve Months | 57,554 | 66,400
Gross Unrealized Losses, Twelve Months and Over | (4,777) | (2,643)
Fair Value, Twelve Months and Over | 115,550 | 106,840
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (104) | (36)
Fair Value, Less Than Twelve Months | 6,864 | 6,924
Gross Unrealized Losses, Twelve Months and Over | (273) | (205)
Fair Value, Twelve Months and Over | 13,927 | 14,054
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (469) | (314)
Fair Value, Less Than Twelve Months | 14,664 | 27,328
Gross Unrealized Losses, Twelve Months and Over | (2,390) | (1,418)
Fair Value, Twelve Months and Over | 61,646 | 53,139
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (94) | (70)
Fair Value, Less Than Twelve Months | 5,640 | 7,149
Gross Unrealized Losses, Twelve Months and Over | (1,507) | (720)
Fair Value, Twelve Months and Over | 27,975 | 28,080
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (472) | (205)
Fair Value, Less Than Twelve Months | 30,386 | 24,999
Gross Unrealized Losses, Twelve Months and Over | (607) | (300)
Fair Value, Twelve Months and Over | $ 12,002 | $ 11,567

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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 that have been in a continuous loss position for less than twelve months. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
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