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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, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Financial Assets: |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 674,289 |  | $ 537,674 |  | $ 588,718 | $ 564,150
Securities held to maturity |  | 3,822,561 | [1] | 5,969,390 | [2] |  |
FHLB stock | [3] | 586,835 |  | 663,971 |  |  |
Loans, net |  | 39,121,599 |  | 38,011,995 |  |  |
Financial Liabilities: |  |  |  |  |  |  |
Deposits |  | 28,882,992 |  | 28,426,758 |  |  |
Borrowed funds |  | 13,908,139 |  | 15,748,405 |  |  |
Financial Assets: |  |  |  |  |  |  |
Cash and cash equivalents |  | 674,289 |  | 537,674 |  |  |
Securities held to maturity |  | 4,093,734 | [1] | 6,108,529 | [2] |  |
FHLB stock | [3] | 586,835 |  | 663,971 |  |  |
Loans, net |  | 39,569,245 |  | 38,245,434 |  |  |
Financial Liabilities: |  |  |  |  |  |  |
Deposits |  | 28,894,119 |  | 28,408,915 |  |  |
Borrowed funds |  | 13,996,619 |  | 15,685,616 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |  |
Cash and cash equivalents |  | 674,289 |  | 537,674 |  |  |
Financial Liabilities: |  |  |  |  |  |  |
Deposits | [4] | 21,865,579 |  | 23,114,271 |  |  |
Significant Other Observable Inputs (Level 2) |  |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |  |
Securities held to maturity |  | 4,092,947 |  | 6,107,697 |  |  |
FHLB stock | [3] | 586,835 |  | 663,971 |  |  |
Financial Liabilities: |  |  |  |  |  |  |
Deposits | [5] | 7,028,540 |  | 5,294,644 |  |  |
Borrowed funds |  | 13,996,619 |  | 15,685,616 |  |  |
Significant Unobservable Inputs (Level 3) |  |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |  |
Securities held to maturity |  | 787 |  | 832 |  |  |
Loans, net |  | $ 39,569,245 |  | $ 38,245,434 |  |  |
[1] | Held-to-maturity securities are reported at a carrying amount equal to amortized cost less the non-credit portion of OTTI recorded in Accumulated Other Comprehensive Loss ("AOCL"). At June 30, 2016, the non-credit portion of OTTI recorded in AOCL was $8.7 million, pre-tax.
[2] | Held-to-maturity securities are reported at a carrying amount equal to amortized cost less the non-credit portion of OTTI recorded in AOCL. At December 31, 2015, the non-credit portion of OTTI recorded in AOCL was $8.7 million, pre-tax.
[3] | Carrying value and estimated fair value are at cost.
[4] | NOW and money market accounts, savings accounts, and non-interest-bearing accounts.
[5] | 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3044-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 5: http://www.xbrl.org/2003/role/presentationRef -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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