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Summary of Portfolio of Securities Held to Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 521,000 $ 3,721,368 [1]
Carrying Amount [1]   3,712,776
Gross Unrealized Gain [1]   117,373
Gross Unrealized Loss [1]   16,190
Fair Value [1]   3,813,959
Mortgage-Related Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost   3,212,563
Carrying Amount   3,212,563
Gross Unrealized Gain   101,326
Gross Unrealized Loss   2,456
Fair Value   3,311,433
Mortgage-Related Securities | GSE certificates    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost   2,193,489
Carrying Amount   2,193,489
Gross Unrealized Gain   64,431
Gross Unrealized Loss   2,399
Fair Value   2,255,521
Mortgage-Related Securities | GSE CMOs    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost [2]   1,019,074
Carrying Amount [2]   1,019,074
Gross Unrealized Gain [2]   36,895
Gross Unrealized Loss [2]   57
Fair Value [2]   1,055,912
Other Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost   508,805
Carrying Amount   500,213
Gross Unrealized Gain   16,047
Gross Unrealized Loss   13,734
Fair Value   502,526
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
Carrying Amount   88,457
Gross Unrealized Gain   3,836
Fair Value   92,293
Other Securities | Corporate bonds    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost   74,217
Carrying Amount   74,217
Gross Unrealized Gain   9,549
Fair Value   83,766
Other Securities | Municipal bonds    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost   71,554
Carrying Amount   71,554
Gross Unrealized Loss   1,789
Fair Value   69,765
Other Securities | Capital trust notes    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost   74,284
Carrying Amount   65,692
Gross Unrealized Gain   2,662
Gross Unrealized Loss   11,872
Fair Value   $ 56,482
[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] Collateralized mortgage obligations.