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Deposits - Additional Information (Detail) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
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

X

- 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

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X

- 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

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- Definition

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+ References

No definition available.

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- Definition

The weighted average interest rate for domestic brokered deposit liabilities.

+ References

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