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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | $ 201,590 | $ 425,635
Fair value more than 12 months | 138,336 | 10,199
Total fair value | 339,926 | 435,834
Unrealized losses less than 12 months | (1,612) | (9,413)
Unrealized losses more than 12 months | (2,989) | (252)
Total unrealized losses | (4,601) | (9,665)
U.S. Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 15,233 | 6,987
Fair value more than 12 months | 1,372 |
Total fair value | 16,605 | 6,987
Unrealized losses less than 12 months | (71) | (64)
Unrealized losses more than 12 months | (43) |
Total unrealized losses | (114) | (64)
State and Municipal [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 41,995 | 142,466
Fair value more than 12 months | 28,127 |
Total fair value | 70,122 | 142,466
Unrealized losses less than 12 months | (483) | (3,544)
Unrealized losses more than 12 months | (935) |
Total unrealized losses | (1,418) | (3,544)
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 61,135 | 112,414
Fair value more than 12 months | 47,213 | 10,199
Total fair value | 108,348 | 122,613
Unrealized losses less than 12 months | (480) | (1,918)
Unrealized losses more than 12 months | (991) | (252)
Total unrealized losses | (1,471) | (2,170)
Federal Agency Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 81,397 | 163,768
Fair value more than 12 months | 61,624 |
Total fair value | 143,021 | 163,768
Unrealized losses less than 12 months | (567) | (3,887)
Unrealized losses more than 12 months | (1,020) |
Total unrealized losses | (1,587) | $ (3,887)
Private Labeled Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 1,830 |
Total fair value | 1,830 |
Unrealized losses less than 12 months | (11) |
Total unrealized losses | $ (11) |

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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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