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Investment Securities - Additional Information (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) Security | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2018 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Number of available-for-sale investment securities in the less than twelve month category (security) | Security | 62 |  |  |
Number of available-for-sale investment securities in the twelve month or more category (security) | Security | 16 |  |  |
Impairment loss on investment securities | $ 0 | $ (1,703) |  |
Investment securities, at fair value | 1,181,661 |  | $ 471,371 |
Unrealized gains (losses) on equity securities | (25,233) | (685) |  |
Gain (Loss) on Investments | 10 | 0 |  |
Pledged investment securities fair value | 701,500 |  | 16,900 |
Equity securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Impairment loss on investment securities |  | $ (1,700) |  |
Investment securities, at fair value |  |  | 3,352 |
Unrealized gains (losses) on equity securities |  |  | 1,000 |
Accounting Standards Update 2016-01 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  | $ 0 |
Accumulated Other Comprehensive Loss | Accounting Standards Update 2016-01 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  | $ 1,000
Other Non-interest Income | Equity securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gain (Loss) on Investments | $ 10 |  |  |

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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for less than one year or normal operating cycle, if longer, for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563 + Details
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- Definition Sum of the carrying amounts as of the date of the latest financial statement presented of securities which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 + Details
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