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Securities - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2013 | Sep. 30, 2018 | Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Available-for-sale securities transferred to held-to-maturity securities |  |  | $ 536,000,000 |  |
Unrealized net loss on securities transferred from available-for-sale to held-to-maturity, Gross |  |  | $ 13,300,000 |  |
Realized gains on the sale of available-for-sale securities | $ 0 | $ 0 |  | $ 248,000 |
Realized losses on sale of available-for-sale securities | 0 |  |  | 0 |
Corporate debt securities, callable, amortized cost | 53,800,000 |  |  | 53,800,000 |
Corporate debt securities, callable, estimated fair value | 51,800,000 |  |  | 51,800,000 |
Securities pledged for other debt obligations, at fair value | 578,500,000 |  |  | 578,500,000 | $ 466,400,000
Reverse Repurchase Agreement |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Securities pledged for repurchase agreements, at fair value | $ 76,800,000 |  |  | $ 76,800,000 | 58,000,000
Investment Securities | U.S. Agency Obligations |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss |  |  |  |  | 0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value |  |  |  |  | $ 0

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- Definition Available For Sale And Held To Maturity Securities Amount Callable Fair Value Disclosure + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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