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Weighted Average Interest Rates for Each Type of Deposit (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Amount
NOW and money market accounts	$ 13,395,080	$ 13,069,019
Savings accounts	5,280,374	7,541,566
Certificates of deposit	7,577,170	5,312,487
Non-interest-bearing accounts	2,635,279	2,503,686
Total deposits	$ 28,887,903	$ 28,426,758
Percent of Total
NOW and money market accounts	46.37%	45.97%
Savings accounts	18.28%	26.53%
Certificates of deposit	26.23%	18.69%
Non-interest-bearing accounts	9.12%	8.81%
Total deposits	100.00%	100.00%
Weighted Average Interest Rate
NOW and money market accounts, weighted average interest rate	0.55%	0.22%
Savings accounts, weighted average interest rate	0.46%	0.63%
Certificates of deposit, weighted average interest rate	1.12%	0.68%
Non-interest-bearing accounts, weighted average interest rate	0.00%	0.00%
Total deposits, weighted average interest rate	0.63%	0.39%

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Percentage of Deposits to Deposits

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Percentage of Deposits to Deposits, Non-Interest-Bearing Accounts

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Percentage of interest bearing deposits to deposits, notice of withdrawal and money market accounts.

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Weighted Average Rate Deposit, Non-Interest-Bearing Accounts

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Weighted Average Rate Deposit, Notice of Withdrawal and Money Market Accounts

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

+ 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)
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Amount of deposits in accounts that offer many of the same services as checking accounts although transactions may be somewhat more limited, share some of the characteristics of a money market fund and are insured by the Federal government, also known as money market accounts. Also includes amount of deposits in interest-bearing transaction accounts at banks or savings and loans, that are restricted in regard to ownership and can usually only be held by individuals, nonprofit entities and governments. Negotiable order of withdrawal accounts differ from money market demand accounts as they typically have higher reserve requirements and no limit on the number of checks that can be written.

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Amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts and money-market deposit accounts (MMDAs).

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of money in noninterest-bearing domestic accounts that entitle the depositor to withdraw funds at any time without prior notice, also known as demand deposits.

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Percentage of interest-bearing domestic certificates of deposit liabilities to total deposit liabilities.

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Percentage of interest-bearing domestic savings deposit liabilities to total deposit liabilities.

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Amount of time deposit liabilities, including certificates of deposit.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=50488274&loc=d3e64164-112818

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-Topic 942
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher SEC
-Name Industry Guide
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-Section V
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The weighted average interest rate for all domestic deposit liabilities.

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The weighted average interest rate for domestic certificates of deposit liabilities.

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The weighted average interest rate for domestic savings deposit liabilities.

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