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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | $ 65,696 | $ 92,615
Fair value more than 12 months | 308,074 | 398,164
Total fair value | 373,770 | 490,779
Unrealized losses less than 12 months | (698) | (1,767)
Unrealized losses more than 12 months | (6,216) | (12,794)
Total unrealized losses | (6,914) | (14,561)
U.S. Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value more than 12 months | 9,823 | 9,707
Total fair value | 9,823 | 9,707
Unrealized losses more than 12 months | (92) | (208)
Total unrealized losses | (92) | (208)
State and Municipal [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 65,265 | 75,163
Fair value more than 12 months | 44,783 | 106,335
Total fair value | 110,048 | 181,498
Unrealized losses less than 12 months | (697) | (1,628)
Unrealized losses more than 12 months | (2,500) | (4,316)
Total unrealized losses | (3,197) | (5,944)
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 431 | 6,450
Fair value more than 12 months | 100,886 | 106,257
Total fair value | 101,317 | 112,707
Unrealized losses less than 12 months | (1) | (25)
Unrealized losses more than 12 months | (1,607) | (3,280)
Total unrealized losses | (1,608) | (3,305)
Federal Agency Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months |  | 5,739
Fair value more than 12 months | 152,582 | 175,865
Total fair value | 152,582 | 181,604
Unrealized losses less than 12 months |  | (39)
Unrealized losses more than 12 months | (2,017) | (4,990)
Total unrealized losses | $ (2,017) | (5,029)
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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