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Summary of Carrying Values, Estimated Fair Values and Fair Value Measurement Levels of Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Financial Assets: |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 2,528,169 |  | $ 557,850 |  | $ 537,674 | $ 564,150
Securities held to maturity | [1] |  |  | 3,712,776 |  |  |
FHLB stock | [2] | 603,819 |  | 590,934 |  |  |
Loans, net |  | 38,265,183 |  | 39,308,016 |  |  |
Financial Liabilities: |  |  |  |  |  |  |
Deposits |  | 29,102,163 |  | 28,887,903 |  |  |
Borrowed funds |  | 12,913,679 |  | 13,673,379 |  |  |
Financial Assets: |  |  |  |  |  |  |
Cash and cash equivalents |  | 2,528,169 |  |  |  |  |
Securities held to maturity | [1] |  |  | 3,813,959 |  |  |
FHLB stock | [2] | 603,819 |  |  |  |  |
Loans, net |  | 38,254,538 |  | 39,416,469 |  |  |
Financial Liabilities: |  |  |  |  |  |  |
Deposits |  | 29,044,852 |  |  |  |  |
Borrowed funds |  | 12,780,653 |  |  |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |  |
Cash and cash equivalents |  | 2,528,169 |  | 557,850 |  |  |
Securities held to maturity |  |  |  | 3,813,959 |  |  |
FHLB stock | [2] |  |  | 590,934 |  |  |
Loans, net |  |  |  | 39,416,469 |  |  |
Financial Liabilities: |  |  |  |  |  |  |
Deposits |  | 20,458,517 | [3] | 28,888,064 |  |  |
Borrowed funds |  |  |  | 13,633,943 |  |  |
Significant Other Observable Inputs (Level 2) |  |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | 557,850 |  |  |
Securities held to maturity |  |  |  | 200,220 |  |  |
FHLB stock | [2] | 603,819 |  |  |  |  |
Financial Liabilities: |  |  |  |  |  |  |
Deposits |  | 8,586,335 | [4] | 21,310,733 | [3] |  |
Borrowed funds |  | 12,780,653 |  |  |  |  |
Significant Unobservable Inputs (Level 3) |  |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |  |
Securities held to maturity |  |  |  | 3,613,739 |  |  |
FHLB stock | [2] |  |  | 590,934 |  |  |
Loans, net |  | $ 38,254,538 |  |  |  |  |
Financial Liabilities: |  |  |  |  |  |  |
Deposits | [4] |  |  | 7,577,331 |  |  |
Borrowed funds |  |  |  | $ 13,633,943 |  |  |
[1] | 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, 2016, the non-credit portion of OTTI recorded in AOCL was $8.6 million (before taxes).
[2] | Carrying value and estimated fair value are at cost.
[3] | Interest-bearing checking and money market accounts, savings accounts, and non-interest-bearing accounts.
[4] | Certificates of deposit.

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