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Summary of Portfolio of Securities Held to Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 3,721,368 [1] $ 5,978,107 [2]
Carrying Amount 3,712,776 [1] 5,969,390 [2]
Gross Unrealized Gain 117,373 [1] 168,470 [2]
Gross Unrealized Loss 16,190 [1] 29,331 [2]
Fair Value 3,813,959 [1] 6,108,529 [2]
Mortgage-Related Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 3,212,563 3,594,861
Carrying Amount 3,212,563 3,594,861
Gross Unrealized Gain 101,326 130,063
Gross Unrealized Loss 2,456 4,779
Fair Value 3,311,433 3,720,145
Mortgage-Related Securities | GSE certificates    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 2,193,489 2,269,828
Carrying Amount 2,193,489 2,269,828
Gross Unrealized Gain 64,431 76,827
Gross Unrealized Loss 2,399 4,722
Fair Value 2,255,521 2,341,933
Mortgage-Related Securities | GSE CMOs    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 1,019,074 [3] 1,325,033
Carrying Amount 1,019,074 [3] 1,325,033
Gross Unrealized Gain 36,895 [3] 53,236
Gross Unrealized Loss 57 [3] 57
Fair Value 1,055,912 [3] 1,378,212
Other Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 508,805 2,383,246
Carrying Amount 500,213 2,374,529
Gross Unrealized Gain 16,047 38,407
Gross Unrealized Loss 13,734 24,552
Fair Value 502,526 2,388,384
Other Securities | U.S. Treasury obligations    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 200,293  
Carrying Amount 200,293  
Gross Unrealized Loss 73  
Fair Value 200,220  
Other Securities | GSE debentures    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 88,457 2,159,856
Carrying Amount 88,457 2,159,856
Gross Unrealized Gain 3,836 23,892
Gross Unrealized Loss   7,568
Fair Value 92,293 2,176,180
Other Securities | Corporate bonds    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 74,217 73,756
Carrying Amount 74,217 73,756
Gross Unrealized Gain 9,549 10,503
Fair Value 83,766 84,259
Other Securities | Municipal bonds    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 71,554 75,317
Carrying Amount 71,554 75,317
Gross Unrealized Gain   262
Gross Unrealized Loss 1,789 1,084
Fair Value 69,765 74,495
Other Securities | Capital trust notes    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 74,284 74,317
Carrying Amount 65,692 65,600
Gross Unrealized Gain 2,662 3,750
Gross Unrealized Loss 11,872 15,900
Fair Value $ 56,482 $ 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 AOCL. At December 31, 2016, the non-credit portion of OTTI recorded in AOCL was $8.6 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, 2015, the non-credit portion of OTTI recorded in AOCL was $8.7 million (before taxes).
[3] Collateralized mortgage obligations.