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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.