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Investment Securities - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Fair value of securities |  | $ 898,600,000 |  |
Net unrealized holding gain after tax |  | $ 3,900,000 | $ 2,600,000 |
Total held-to-maturity investment securities | $ 878,953,000 |  | 878,953,000 | $ 850,989,000
Total held-to-maturity investment securities |  |  |  | 1,300,000
Net gain of held-to-maturity investment securities | 546,000 |  |  |
Investment securities pledged as collateral | 2,250,000,000 |  | 2,250,000,000 | 2,810,000,000
Investment in FHLB stock, impairment losses | $ 0 |  | $ 0 |
United States [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Securities issued by U.S. government percentage | 87.00% |  | 87.00% |
CMO/REMIC - Residential [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total held-to-maturity investment securities | $ 192,680,000 |  | $ 192,680,000 | $ 1,284,000
Total CMO backed by whole loans issued by private-label companies (non-government sponsored) | $ 101,000 |  | $ 101,000 |

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- Definition Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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