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Summary of Portfolio of Securities Held to Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized Cost | $ 5,978,107 | [1] | $ 6,931,498 | [2]
Carrying Amount | 5,969,390 | [1] | 6,922,667 | [2]
Gross Unrealized Gain | 168,470 | [1] | 212,968 | [2]
Gross Unrealized Loss | 29,331 | [1] | 49,664 | [2]
Fair Value | 6,108,529 | [1] | 7,085,971 | [2]
Mortgage-Related Securities |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized Cost | 3,594,861 |  | 4,079,034 |
Carrying Amount | 3,594,861 |  | 4,079,034 |
Gross Unrealized Gain | 130,063 |  | 171,489 |
Gross Unrealized Loss | 4,779 |  | 4,549 |
Fair Value | 3,720,145 |  | 4,245,974 |
Mortgage-Related Securities | GSE certificates |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized Cost | 2,269,828 |  | 2,468,791 |
Carrying Amount | 2,269,828 |  | 2,468,791 |
Gross Unrealized Gain | 76,827 |  | 106,414 |
Gross Unrealized Loss | 4,722 |  | 3,838 |
Fair Value | 2,341,933 |  | 2,571,367 |
Mortgage-Related Securities | GSE CMOs |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized Cost | 1,325,033 | [3] | 1,610,243 |
Carrying Amount | 1,325,033 | [3] | 1,610,243 |
Gross Unrealized Gain | 53,236 | [3] | 65,075 |
Gross Unrealized Loss | 57 | [3] | 711 |
Fair Value | 1,378,212 | [3] | 1,674,607 |
Other Securities |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized Cost | 2,383,246 |  | 2,852,464 |
Carrying Amount | 2,374,529 |  | 2,843,633 |
Gross Unrealized Gain | 38,407 |  | 41,479 |
Gross Unrealized Loss | 24,552 |  | 45,115 |
Fair Value | 2,388,384 |  | 2,839,997 |
Other Securities | GSE debentures |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized Cost | 2,159,856 |  | 2,635,989 |
Carrying Amount | 2,159,856 |  | 2,635,989 |
Gross Unrealized Gain | 23,892 |  | 24,173 |
Gross Unrealized Loss | 7,568 |  | 32,920 |
Fair Value | 2,176,180 |  | 2,627,242 |
Other Securities | Corporate bonds |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized Cost | 73,756 |  | 73,317 |
Carrying Amount | 73,756 |  | 73,317 |
Gross Unrealized Gain | 10,503 |  | 12,113 |
Fair Value | 84,259 |  | 85,430 |
Other Securities | Municipal bonds |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized Cost | 75,317 |  | 58,682 |
Carrying Amount | 75,317 |  | 58,682 |
Gross Unrealized Gain | 262 |  |  |
Gross Unrealized Loss | 1,084 |  | 1,027 |
Fair Value | 74,495 |  | 57,655 |
Other Securities | Capital trust notes |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized Cost | 74,317 |  | 84,476 |
Carrying Amount | 65,600 |  | 75,645 |
Gross Unrealized Gain | 3,750 |  | 5,193 |
Gross Unrealized Loss | 15,900 |  | 11,168 |
Fair Value | $ 53,450 |  | $ 69,670 |
[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, 2015, the non-credit portion of OTTI recorded in AOCL was $8.7 million (before taxes).
[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, 2014, the non-credit portion of OTTI recorded in AOCL was $8.8 million (before taxes).
[3] | Collateralized mortgage obligations.

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