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Deposits - Additional Information (Detail) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Investments [Line Items] |  |
Aggregate amounts of deposits reclassified as loan balances | $ 3,100,000 | $ 3,100,000
Brokered deposits | $ 4,000,000,000 | $ 3,900,000,000
Brokered deposits, weighted average interest rates | 1.37% | 0.62%
Money Market |  |
Schedule of Investments [Line Items] |  |
Brokered deposits | $ 2,600,000,000 | $ 2,500,000,000
Interest Bearing Checking Accounts |  |
Schedule of Investments [Line Items] |  |
Brokered deposits | 793,700,000 | 1,400,000,000
Certificates of Deposits |  |
Schedule of Investments [Line Items] |  |
Brokered deposits | $ 567,800,000 | $ 0

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- Definition Amount of deposits held by the entity that have been reclassified as loan balances receivable, for example, but not limited to, overdrafts receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=50488274&loc=d3e64164-112818 + Details
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- Definition Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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