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Summary of Carrying Values, Estimated Fair Values and Fair Value Measurement Levels of Financial Instruments (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financial Assets: |  |  |
Cash and cash equivalents |  | $ 2,204,397 | $ 2,528,169
FHLB stock | [1] | 653,075 | 603,819
Loans, net |  | 39,287,173 | 38,265,183
Financial Liabilities: |  |  |
Deposits |  | 29,555,845 | 29,102,163
Borrowed funds |  | 13,793,839 | 12,913,679
Financial Assets: |  |  |
Cash and cash equivalents |  | 2,204,397 | 2,528,169
FHLB stock | [1] | 653,075 | 603,819
Loans, net |  | 38,834,022 | 38,254,538
Financial Liabilities: |  |  |
Deposits |  | 29,503,131 | 29,044,852
Borrowed funds |  | 13,649,155 | 12,780,653
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Financial Assets: |  |  |
Cash and cash equivalents |  | 2,204,397 | 2,528,169
Financial Liabilities: |  |  |
Deposits | [2] | 19,249,326 | 20,458,517
Significant Other Observable Inputs (Level 2) |  |  |
Financial Assets: |  |  |
FHLB stock | [1] | 653,075 | 603,819
Financial Liabilities: |  |  |
Deposits | [3] | 10,253,805 | 8,586,335
Borrowed funds |  | 13,649,155 | 12,780,653
Significant Unobservable Inputs (Level 3) |  |  |
Financial Assets: |  |  |
Loans, net |  | $ 38,834,022 | $ 38,254,538
[1] | Carrying value and estimated fair value are at cost.
[2] | Interest-bearing checking and money market accounts, savings accounts, and non-interest-bearing accounts.
[3] | Certificates of deposit.

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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