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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Fair Value less than 12 months | $ 352,517 | $ 229,768
Fair value more than 12 months | 313,819 | 193,869
Total fair value | 666,336 | 423,637
Unrealized losses less than 12 months | (6,027) | (4,554)
Unrealized losses more than 12 months | (16,412) | (4,974)
Total unrealized losses | (22,439) | (9,528)
U.S. Treasury and Federal Agencies [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value less than 12 months | 7,763 | 15,882
Fair value more than 12 months | 8,809 | 2,870
Total fair value | 16,572 | 18,752
Unrealized losses less than 12 months | (137) | (180)
Unrealized losses more than 12 months | (327) | (45)
Total unrealized losses | (464) | (225)
State and Municipal [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value less than 12 months | 215,439 | 54,312
Fair value more than 12 months | 56,725 | 30,691
Total fair value | 272,164 | 85,003
Unrealized losses less than 12 months | (3,691) | (2,758)
Unrealized losses more than 12 months | (4,760) | (844)
Total unrealized losses | (8,451) | (3,602)
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value less than 12 months | 72,495 | 54,006
Fair value more than 12 months | 102,498 | 73,462
Total fair value | 174,993 | 127,468
Unrealized losses less than 12 months | (830) | (589)
Unrealized losses more than 12 months | (4,750) | (2,031)
Total unrealized losses | (5,580) | (2,620)
Federal Agency Mortgage-backed Pools [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value less than 12 months | 48,696 | 103,926
Fair value more than 12 months | 145,787 | 86,846
Total fair value | 194,483 | 190,772
Unrealized losses less than 12 months | (1,270) | (1,019)
Unrealized losses more than 12 months | (6,575) | (2,054)
Total unrealized losses | (7,845) | (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 | 8,124 |
Total fair value | 8,124 |
Unrealized losses less than 12 months | (99) |
Total unrealized losses | $ (99) |

X
- 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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