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Summary of Carrying Values, Estimated Fair Values and Fair Value Measurement Levels of Financial Instruments (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Financial Assets: |  |  |  |  |  |
Cash and cash equivalents |  | $ 984,296 | $ 557,850 |  | $ 650,880 | $ 537,674
Securities held to maturity |  | 3,642,104 | 3,712,776 | [1] |  |
FHLB stock | [2] | 577,943 | 590,934 |  |  |
Loans, net |  | 38,973,215 | 39,308,016 |  |  |
Financial Liabilities: |  |  |  |  |  |
Deposits |  | 28,726,546 | 28,887,903 |  |  |
Borrowed funds |  | 13,213,452 | 13,673,379 |  |  |
Financial Assets: |  |  |  |  |  |
Cash and cash equivalents |  | 984,296 | 557,850 |  |  |
Securities held to maturity |  | 3,750,049 | 3,813,959 | [1] |  |
FHLB stock | [2] | 577,943 | 590,934 |  |  |
Loans, net |  | 39,177,036 | 39,416,469 |  |  |
Financial Liabilities: |  |  |  |  |  |
Deposits |  | 28,718,398 | 28,888,064 |  |  |
Borrowed funds |  | 13,163,397 | 13,633,943 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |
Cash and cash equivalents |  | 984,296 | 557,850 |  |  |
Securities held to maturity |  | 200,055 | 200,220 |  |  |
Financial Liabilities: |  |  |  |  |  |
Deposits | [3] | 21,164,339 | 21,310,733 |  |  |
Significant Other Observable Inputs (Level 2) |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |
Securities held to maturity |  | 3,549,994 | 3,613,739 |  |  |
FHLB stock | [2] | 577,943 | 590,934 |  |  |
Financial Liabilities: |  |  |  |  |  |
Deposits | [4] | 7,554,059 | 7,577,331 |  |  |
Borrowed funds |  | 13,163,397 | 13,633,943 |  |  |
Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |
Loans, net |  | $ 39,177,036 | $ 39,416,469 |  |  |
[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] | NOW and money market accounts, savings accounts, and non-interest-bearing accounts.
[4] | Certificates of deposit.

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