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Investment Securities (Held to Maturity) (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | $ 481,845 | $ 488,183
Gross unrealized gains | 10,430 | 6,675
Gross unrealized losses | (1,850) | (5,571)
Fair value | 490,425 | 489,287
Agency Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 4,307 | 4,306
Gross unrealized gains | 0 | 2
Gross unrealized losses | (55) | (83)
Fair value | 4,252 | 4,225
Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 475 | 893
Gross unrealized gains | 17 | 31
Gross unrealized losses | 0 | 0
Fair value | 492 | 924
State And Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 467,113 | 473,653
Gross unrealized gains | 10,407 | 6,635
Gross unrealized losses | (1,761) | (5,436)
Fair value | 475,759 | 474,852
Corporate Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 9,950 | 9,331
Gross unrealized gains | 6 | 7
Gross unrealized losses | (34) | (52)
Fair value | $ 9,922 | $ 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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