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Investment Securities - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items] |  |
Average life of investment grade debt securities, years | 4 years |
Credit-related impairment loss on investment securities held-to-maturity | $ 0 | $ 0
Investment securities pledged as collateral | 1,910,000,000 | $ 2,190,000,000
Investment in FHLB stock, impairment losses | $ 0 |
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Average life of investment grade debt securities, years | 9 years 10 months 25 days |
Government Agency/GSE [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Agency bond callable | $ 101,300,000 |
United States [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities issued by U.S. government percentage | 89.00% |
CMO/REMIC - Residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investment contractual cash flows guaranteed by Government, percentage | 100.00% |

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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 45 -Paragraph 9A -URI http://asc.fasb.org/extlink&oid=82896770&loc=SL6284427-111562 Reference 2: 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=82897076&loc=d3e27161-111563 Reference 3: 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=84228862&loc=SL7669686-108580 + Details
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