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Summary of Portfolio of Securities Held to Maturity (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost |  | $ 4,077,437 | [1] | $ 5,978,107 | [2]
Carrying Amount |  | 4,068,750 | [1] | 5,969,390 | [2]
Gross Unrealized Gain |  | 252,159 | [1] | 168,470 | [2]
Gross Unrealized Loss |  | 16,748 | [1] | 29,331 | [2]
Fair Value |  | 4,304,161 | [1] | 6,108,529 | [2]
Mortgage-Related Securities |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 3,486,101 |  | 3,594,861 |
Carrying Amount |  | 3,486,101 |  | 3,594,861 |
Gross Unrealized Gain |  | 216,930 |  | 130,063 |
Gross Unrealized Loss |  | 54 |  | 4,779 |
Fair Value |  | 3,702,977 |  | 3,720,145 |
Mortgage-Related Securities | GSE certificates |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 2,256,996 |  | 2,269,828 |
Carrying Amount |  | 2,256,996 |  | 2,269,828 |
Gross Unrealized Gain |  | 140,529 |  | 76,827 |
Gross Unrealized Loss |  | 54 |  | 4,722 |
Fair Value |  | 2,397,471 |  | 2,341,933 |
Mortgage-Related Securities | GSE CMOs |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | [3] | 1,229,105 |  | 1,325,033 |
Carrying Amount | [3] | 1,229,105 |  | 1,325,033 |
Gross Unrealized Gain | [3] | 76,401 |  | 53,236 |
Gross Unrealized Loss | [3] |  |  | 57 |
Fair Value | [3] | 1,305,506 |  | 1,378,212 |
Other Securities |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 591,336 |  | 2,383,246 |
Carrying Amount |  | 582,649 |  | 2,374,529 |
Gross Unrealized Gain |  | 35,229 |  | 38,407 |
Gross Unrealized Loss |  | 16,694 |  | 24,552 |
Fair Value |  | 601,184 |  | 2,388,384 |
Other Securities | GSE debentures |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 368,784 |  | 2,159,856 |
Carrying Amount |  | 368,784 |  | 2,159,856 |
Gross Unrealized Gain |  | 19,461 |  | 23,892 |
Gross Unrealized Loss |  |  |  | 7,568 |
Fair Value |  | 388,245 |  | 2,176,180 |
Other Securities | Corporate bonds |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 73,871 |  | 73,756 |
Carrying Amount |  | 73,871 |  | 73,756 |
Gross Unrealized Gain |  | 11,049 |  | 10,503 |
Fair Value |  | 84,920 |  | 84,259 |
Other Securities | Municipal bonds |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 74,419 |  | 75,317 |
Carrying Amount |  | 74,419 |  | 75,317 |
Gross Unrealized Gain |  | 1,661 |  | 262 |
Gross Unrealized Loss |  |  |  | 1,084 |
Fair Value |  | 76,080 |  | 74,495 |
Other Securities | Capital trust notes |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 74,262 |  | 74,317 |
Carrying Amount |  | 65,575 |  | 65,600 |
Gross Unrealized Gain |  | 3,058 |  | 3,750 |
Gross Unrealized Loss |  | 16,694 |  | 15,900 |
Fair Value |  | $ 51,939 |  | $ 53,450 |
[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 March 31, 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] | Collateralized mortgage obligations.

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