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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | $ 92,615 | $ 229,768
Fair value more than 12 months | 398,164 | 193,869
Total fair value | 490,779 | 423,637
Unrealized losses less than 12 months | (1,767) | (4,554)
Unrealized losses more than 12 months | (12,794) | (4,974)
Total unrealized losses | (14,561) | (9,528)
U.S. Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months |  | 15,882
Fair value more than 12 months | 9,707 | 2,870
Total fair value | 9,707 | 18,752
Unrealized losses less than 12 months |  | (180)
Unrealized losses more than 12 months | (208) | (45)
Total unrealized losses | (208) | (225)
State and Municipal [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 75,163 | 54,312
Fair value more than 12 months | 106,335 | 30,691
Total fair value | 181,498 | 85,003
Unrealized losses less than 12 months | (1,628) | (2,758)
Unrealized losses more than 12 months | (4,316) | (844)
Total unrealized losses | (5,944) | (3,602)
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 6,450 | 54,006
Fair value more than 12 months | 106,257 | 73,462
Total fair value | 112,707 | 127,468
Unrealized losses less than 12 months | (25) | (589)
Unrealized losses more than 12 months | (3,280) | (2,031)
Total unrealized losses | (3,305) | (2,620)
Federal Agency Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 5,739 | 103,926
Fair value more than 12 months | 175,865 | 86,846
Total fair value | 181,604 | 190,772
Unrealized losses less than 12 months | (39) | (1,019)
Unrealized losses more than 12 months | (4,990) | (2,054)
Total unrealized losses | (5,029) | (3,073)
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)
Corporate Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 5,263 |
Total fair value | 5,263 |
Unrealized losses less than 12 months | (75) |
Total unrealized losses | $ (75) |

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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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