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Summary of Portfolio of Securities Held to Maturity (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 3,831,217 [1] $ 5,978,107 [2]
Carrying Amount 3,822,561 [1] 5,969,390 [2]
Gross Unrealized Gain 287,195 [1] 168,470 [2]
Gross Unrealized Loss 16,022 [1] 29,331 [2]
Fair Value 4,093,734 [1] 6,108,529 [2]
Mortgage-Related Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 3,429,807 3,594,861
Carrying Amount 3,429,807 3,594,861
Gross Unrealized Gain 255,859 130,063
Gross Unrealized Loss   4,779
Fair Value 3,685,666 3,720,145
Mortgage-Related Securities | GSE certificates    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 2,239,688 2,269,828
Carrying Amount 2,239,688 2,269,828
Gross Unrealized Gain 169,049 76,827
Gross Unrealized Loss   4,722
Fair Value 2,408,737 2,341,933
Mortgage-Related Securities | GSE CMOs    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 1,190,119 [3] 1,325,033
Carrying Amount 1,190,119 [3] 1,325,033
Gross Unrealized Gain 86,810 [3] 53,236
Gross Unrealized Loss   57
Fair Value 1,276,929 [3] 1,378,212
Other Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 401,410 2,383,246
Carrying Amount 392,754 2,374,529
Gross Unrealized Gain 31,336 38,407
Gross Unrealized Loss 16,022 24,552
Fair Value 408,068 2,388,384
Other Securities | GSE debentures    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 179,366 2,159,856
Carrying Amount 179,366 2,159,856
Gross Unrealized Gain 14,326 23,892
Gross Unrealized Loss   7,568
Fair Value 193,692 2,176,180
Other Securities | Corporate bonds    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 73,983 73,756
Carrying Amount 73,983 73,756
Gross Unrealized Gain 10,706 10,503
Fair Value 84,689 84,259
Other Securities | Municipal bonds    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 73,792 75,317
Carrying Amount 73,792 75,317
Gross Unrealized Gain 2,984 262
Gross Unrealized Loss   1,084
Fair Value 76,776 74,495
Other Securities | Capital trust notes    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 74,269 74,317
Carrying Amount 65,613 65,600
Gross Unrealized Gain 3,320 3,750
Gross Unrealized Loss 16,022 15,900
Fair Value $ 52,911 $ 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 June 30, 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.