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Summary of Carrying Values, Estimated Fair Values and Fair Value Measurement Levels of Financial Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Financial Assets: |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 771,782 |  | $ 537,674 |  | $ 585,794 | $ 564,150
Securities held to maturity |  | 3,651,925 | [1] | 5,969,390 | [2] |  |
FHLB stock | [3] | 586,355 |  | 663,971 |  |  |
Loans, net |  | 39,671,237 |  | 38,011,995 |  |  |
Financial Liabilities: |  |  |  |  |  |  |
Deposits |  | 29,139,599 |  | 28,426,758 |  |  |
Borrowed funds |  | 14,001,809 |  | 15,748,405 |  |  |
Financial Assets: |  |  |  |  |  |  |
Cash and cash equivalents |  | 771,782 |  | 537,674 |  |  |
Securities held to maturity |  | 3,893,086 | [1] | 6,108,529 | [2] |  |
FHLB stock | [3] | 586,355 |  | 663,971 |  |  |
Loans, net |  | 40,099,680 |  | 38,245,434 |  |  |
Financial Liabilities: |  |  |  |  |  |  |
Deposits |  | 29,156,152 |  | 28,408,915 |  |  |
Borrowed funds |  | 14,057,006 |  | 15,685,616 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |  |
Cash and cash equivalents |  | 771,782 |  | 537,674 |  |  |
Financial Liabilities: |  |  |  |  |  |  |
Deposits | [4] | 21,755,869 |  | 23,114,271 |  |  |
Significant Other Observable Inputs (Level 2) |  |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |  |
Securities held to maturity |  | 3,892,670 |  | 6,107,697 |  |  |
FHLB stock | [3] | 586,355 |  | 663,971 |  |  |
Financial Liabilities: |  |  |  |  |  |  |
Deposits | [5] | 7,400,283 |  | 5,294,644 |  |  |
Borrowed funds |  | 14,057,006 |  | 15,685,616 |  |  |
Significant Unobservable Inputs (Level 3) |  |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |  |
Securities held to maturity |  | 416 |  | 832 |  |  |
Loans, net |  | $ 40,099,680 |  | $ 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 September 30, 2016, the non-credit portion of OTTI recorded in AOCL was $8.6 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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