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Summary of Portfolio of Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 5,660,418 $ 3,464,279 [1]
Gross Unrealized Gain 46,339 81,594 [1]
Gross Unrealized Loss 62,686 14,446 [1]
Fair Value 5,644,071 3,531,427 [1]
Mortgage-Related Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,953,957 2,559,961
Gross Unrealized Gain 26,526 60,810
Gross Unrealized Loss 20,201 2,025
Fair Value 2,960,282 2,618,746
Mortgage-Related Securities | GSE certificates    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,705,336 2,023,677
Gross Unrealized Gain 18,146 46,364
Gross Unrealized Loss 15,961 1,199
Fair Value 1,707,521 2,068,842
Mortgage-Related Securities | GSE CMOs    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,248,621 536,284
Gross Unrealized Gain 8,380 14,446
Gross Unrealized Loss 4,240 826
Fair Value 1,252,761 549,904
Other Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   904,318
Gross Unrealized Gain   20,784
Gross Unrealized Loss   12,421
Fair Value   912,681
Other Securities | U.S. Treasury obligations    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   199,960
Gross Unrealized Gain   0
Gross Unrealized Loss   62
Fair Value   199,898
Other Securities | GSE debentures    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   473,879
Gross Unrealized Gain   2,044
Gross Unrealized Loss   2,665
Fair Value   473,258
Other Securities | Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   79,702
Gross Unrealized Gain   11,073
Gross Unrealized Loss   0
Fair Value   90,775
Other Securities | Municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   70,381
Gross Unrealized Gain   540
Gross Unrealized Loss   801
Fair Value   70,120
Other Securities | Capital trust notes    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   48,230
Gross Unrealized Gain   6,498
Gross Unrealized Loss   8,632
Fair Value   46,096
Other Securities | Preferred stock    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   15,292
Gross Unrealized Gain   142
Gross Unrealized Loss   0
Fair Value   15,434
Other Securities | Mutual Funds and Common Stock    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost [2]   16,874
Gross Unrealized Gain [2]   487
Gross Unrealized Loss [2]   261
Fair Value [2]   $ 17,100
Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 32,162  
Gross Unrealized Gain 366  
Gross Unrealized Loss 1,977  
Fair Value 30,551  
Equity Securities [Member] | Preferred stock    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 15,292  
Gross Unrealized Gain 0  
Gross Unrealized Loss 1,446  
Fair Value 13,846  
Equity Securities [Member] | Mutual Funds and Common Stock    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost [2] 16,870  
Gross Unrealized Gain [2] 366  
Gross Unrealized Loss [2] 531  
Fair Value [2] 16,705  
Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,674,299  
Gross Unrealized Gain 19,447  
Gross Unrealized Loss 40,508  
Fair Value 2,653,238  
Debt Securities [Member] | GSE debentures    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,334,549  
Gross Unrealized Gain 3,366  
Gross Unrealized Loss 8,988  
Fair Value 1,328,927  
Debt Securities [Member] | Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 836,153  
Gross Unrealized Gain 8,667  
Gross Unrealized Loss 23,105  
Fair Value 821,715  
Debt Securities [Member] | Municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 68,551  
Gross Unrealized Gain 195  
Gross Unrealized Loss 2,563  
Fair Value 66,183  
Debt Securities [Member] | Capital trust notes    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 48,278  
Gross Unrealized Gain 6,435  
Gross Unrealized Loss 5,422  
Fair Value 49,291  
Debt Securities [Member] | Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost [3] 386,768  
Gross Unrealized Gain [3] 784  
Gross Unrealized Loss [3] 430  
Fair Value [3] 387,122  
Mortgage Backed Securities And Other Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost [4] 5,628,256  
Gross Unrealized Gain [4] 45,973  
Gross Unrealized Loss [4] 60,709  
Fair Value [4] $ 5,613,520  
[1] The amortized cost includes the non-credit portion of OTTI recorded in AOCL. At December 31, 2017, the non-credit portion of OTTI recorded in AOCL was $8.6 million before taxes.
[2] Primarily consists of mutual funds that are CRA-qualified investments.
[3] The underlying assets of the asset-backed securities are substantially guaranteed by the U.S. Government.
[4] The amortized cost includes the non-credit portion of OTTI recorded in AOCL. At December 31, 2018, the non-credit portion of OTTI recorded in AOCL was $8.6 million before taxes.