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Summary of Portfolio of Securities Held to Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 3,650,663 $ 3,721,368 [1]
Carrying Amount 3,642,104 3,712,776 [1]
Gross Unrealized Gain 121,015 117,373 [1]
Gross Unrealized Loss 13,070 16,190 [1]
Fair Value 3,750,049 3,813,959 [1]
Mortgage-Related Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 3,142,193 3,212,563
Carrying Amount 3,142,193 3,212,563
Gross Unrealized Gain 103,116 101,326
Gross Unrealized Loss 1,297 2,456
Fair Value 3,244,012 3,311,433
Mortgage-Related Securities | GSE certificates    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 2,170,706 2,193,489
Carrying Amount 2,170,706 2,193,489
Gross Unrealized Gain 70,183 64,431
Gross Unrealized Loss 1,078 2,399
Fair Value 2,239,811 2,255,521
Mortgage-Related Securities | GSE CMOs    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 971,487 [2] 1,019,074
Carrying Amount 971,487 [2] 1,019,074
Gross Unrealized Gain 32,933 [2] 36,895
Gross Unrealized Loss 219 [2] 57
Fair Value 1,004,201 [2] 1,055,912
Other Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 508,470 508,805
Carrying Amount 499,911 500,213
Gross Unrealized Gain 17,899 16,047
Gross Unrealized Loss 11,773 13,734
Fair Value 506,037 502,526
Other Securities | U.S. Treasury obligations    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 200,158 200,293
Carrying Amount 200,158 200,293
Gross Unrealized Loss 103 73
Fair Value 200,055 200,220
Other Securities | GSE debentures    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 88,387 88,457
Carrying Amount 88,387 88,457
Gross Unrealized Gain 3,565 3,836
Fair Value 91,952 92,293
Other Securities | Corporate bonds    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 74,337 74,217
Carrying Amount 74,337 74,217
Gross Unrealized Gain 11,079 9,549
Fair Value 85,416 83,766
Other Securities | Municipal bonds    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 71,297 71,554
Carrying Amount 71,297 71,554
Gross Unrealized Gain 533  
Gross Unrealized Loss 1,474 1,789
Fair Value 70,356 69,765
Other Securities | Capital trust notes    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 74,291 74,284
Carrying Amount 65,732 65,692
Gross Unrealized Gain 2,722 2,662
Gross Unrealized Loss 10,196 11,872
Fair Value $ 58,258 $ 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.