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Weighted Average Interest Rates for Each Type of Deposit (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Amount |  |  |
NOW and money market accounts |  | $ 13,069,019 | $ 12,549,600
Savings accounts |  | 7,541,566 | 7,051,622
Certificates of deposit |  | 5,312,487 | 6,420,598
Non-interest-bearing accounts |  | 2,503,686 | 2,306,914
Total deposits |  | $ 28,426,758 | $ 28,328,734
Percent of Total |  |  |
NOW and money market accounts, percent |  | 45.97% | 44.30%
Savings accounts, percent |  | 26.53% | 24.89%
Certificates of deposit, percent |  | 18.69% | 22.67%
Non-interest-bearing accounts, percent |  | 8.81% | 8.14%
Total deposits, percent |  | 100.00% | 100.00%
Weighted Average Interest Rate |  |  |
NOW and money market accounts, weighted average interest rate | [1] | 0.22% | 0.37%
Savings accounts, weighted average interest rate | [1] | 0.63% | 0.60%
Certificates of deposit, weighted average interest rate | [1] | 0.68% | 1.15%
Non-interest-bearing accounts, weighted average interest rate | [1] | 0.00% | 0.00%
Total deposits, weighted average interest rate | [1] | 0.39% | 0.57%
[1] | Excludes the effect of purchase accounting adjustments for certain certificates of deposit ("CDs").

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- Definition 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) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition 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. + References No definition available. + Details
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- Definition Amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts. + 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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