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Investment Securities Held to Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | $ 477,652 | $ 488,183
Gross unrealized gains | 9,295 | 6,675
Gross unrealized losses | (1,908) | (5,571)
Fair value | 485,039 | 489,287
Agency Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 4,308 | 4,306
Gross unrealized gains | 0 | 2
Gross unrealized losses | (87) | (83)
Fair value | 4,221 | 4,225
Mortgage-backed securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 382 | 893
Gross unrealized gains | 14 | 31
Gross unrealized losses | 0 | 0
Fair value | 396 | 924
State and municipal obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 462,942 | 473,653
Gross unrealized gains | 9,280 | 6,635
Gross unrealized losses | (1,738) | (5,436)
Fair value | 470,484 | 474,852
Corporate Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 10,020 | 9,331
Gross unrealized gains | 1 | 7
Gross unrealized losses | (83) | (52)
Fair value | $ 9,938 | $ 9,286

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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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