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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Fair Value less than 12 months | $ 357,355 | $ 229,768
Fair value more than 12 months | 194,073 | 193,869
Total fair value | 551,428 | 423,637
Unrealized losses less than 12 months | (9,431) | (4,554)
Unrealized losses more than 12 months | (8,755) | (4,974)
Total unrealized losses | (18,186) | (9,528)
U.S. Treasury and Federal Agencies [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value less than 12 months | 20,387 | 15,882
Fair value more than 12 months | 3,832 | 2,870
Total fair value | 24,219 | 18,752
Unrealized losses less than 12 months | (352) | (180)
Unrealized losses more than 12 months | (83) | (45)
Total unrealized losses | (435) | (225)
State and Municipal [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value less than 12 months | 149,412 | 54,312
Fair value more than 12 months | 37,546 | 30,691
Total fair value | 186,958 | 85,003
Unrealized losses less than 12 months | (4,495) | (2,758)
Unrealized losses more than 12 months | (1,865) | (844)
Total unrealized losses | (6,360) | (3,602)
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value less than 12 months | 67,216 | 54,006
Fair value more than 12 months | 67,923 | 73,462
Total fair value | 135,139 | 127,468
Unrealized losses less than 12 months | (1,507) | (589)
Unrealized losses more than 12 months | (3,010) | (2,031)
Total unrealized losses | (4,517) | (2,620)
Federal Agency Mortgage-backed Pools [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value less than 12 months | 119,369 | 103,926
Fair value more than 12 months | 84,772 | 86,846
Total fair value | 204,141 | 190,772
Unrealized losses less than 12 months | (3,073) | (1,019)
Unrealized losses more than 12 months | (3,797) | (2,054)
Total unrealized losses | (6,870) | (3,073)
Private Labeled Mortgage-backed Pools [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value less than 12 months |  | 1,642
Total fair value |  | 1,642
Unrealized losses less than 12 months |  | (8)
Total unrealized losses |  | $ (8)
Corporate Notes [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value less than 12 months | 971 |
Total fair value | 971 |
Unrealized losses less than 12 months | (4) |
Total unrealized losses | $ (4) |

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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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