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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | $ 229,768 | $ 425,635
Fair value more than 12 months | 193,869 | 10,199
Total fair value | 423,637 | 435,834
Unrealized losses less than 12 months | (4,554) | (9,413)
Unrealized losses more than 12 months | (4,974) | (252)
Total unrealized losses | (9,528) | (9,665)
U.S. Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 15,882 | 6,987
Fair value more than 12 months | 2,870 |
Total fair value | 18,752 | 6,987
Unrealized losses less than 12 months | (180) | (64)
Unrealized losses more than 12 months | (45) |
Total unrealized losses | (225) | (64)
State and Municipal [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 54,312 | 142,466
Fair value more than 12 months | 30,691 |
Total fair value | 85,003 | 142,466
Unrealized losses less than 12 months | (2,758) | (3,544)
Unrealized losses more than 12 months | (844) |
Total unrealized losses | (3,602) | (3,544)
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 54,006 | 112,414
Fair value more than 12 months | 73,462 | 10,199
Total fair value | 127,468 | 122,613
Unrealized losses less than 12 months | (589) | (1,918)
Unrealized losses more than 12 months | (2,031) | (252)
Total unrealized losses | (2,620) | (2,170)
Federal Agency Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 103,926 | 163,768
Fair value more than 12 months | 86,846 |
Total fair value | 190,772 | 163,768
Unrealized losses less than 12 months | (1,019) | (3,887)
Unrealized losses more than 12 months | (2,054) |
Total unrealized losses | (3,073) | $ (3,887)
Private Labeled Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [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) |

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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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