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Summary of Portfolio of Securities Available for Sale and Equity Investments with Readily Determinable Fair Values (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 4,838,804 $ 3,464,279 [1]
Gross Unrealized Gain 28,110 81,594 [1]
Gross Unrealized Loss 70,907 14,446 [1]
Fair Value 4,796,007 3,531,427 [1]
Mortgage-Related Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,811,486 2,559,961
Gross Unrealized Gain 8,904 60,810
Gross Unrealized Loss 39,494 2,025
Fair Value 2,780,896 2,618,746
Mortgage-Related Securities | GSE certificates    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,892,104 2,023,677
Gross Unrealized Gain 5,113 46,364
Gross Unrealized Loss 33,361 1,199
Fair Value 1,863,856 2,068,842
Mortgage-Related Securities | GSE CMOs    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 919,382 536,284
Gross Unrealized Gain 3,791 14,446
Gross Unrealized Loss 6,133 826
Fair Value 917,040 549,904
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 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 | 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 | Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   79,702
Gross Unrealized Gain   11,073
Fair Value   90,775
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
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
Debt Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,995,152  
Gross Unrealized Gain 18,830  
Gross Unrealized Loss 30,595  
Fair Value 1,983,387  
Debt Securities | GSE debentures    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,043,927  
Gross Unrealized Gain 632  
Gross Unrealized Loss 22,868  
Fair Value 1,021,691  
Debt Securities | Municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 69,276  
Gross Unrealized Gain 100  
Gross Unrealized Loss 1,877  
Fair Value 67,499  
Debt Securities | Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 445,902  
Gross Unrealized Gain 10,384  
Gross Unrealized Loss 655  
Fair Value 455,631  
Debt Securities | Capital trust notes    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 48,265  
Gross Unrealized Gain 6,639  
Gross Unrealized Loss 4,661  
Fair Value 50,243  
Debt Securities | Asset backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost [3] 387,782  
Gross Unrealized Gain [3] 1,075  
Gross Unrealized Loss [3] 534  
Fair Value [3] 388,323  
Mortgage Backed Securities And Other Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost [4] 4,806,638  
Gross Unrealized Gain [4] 27,734  
Gross Unrealized Loss [4] 70,089  
Fair Value [4] 4,764,283  
Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 32,166  
Gross Unrealized Gain 376  
Gross Unrealized Loss 818  
Fair Value 31,724  
Equity securities | Preferred stock    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 15,292  
Gross Unrealized Loss 138  
Fair Value 15,154  
Equity securities | Mutual Funds and Common Stock    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost [2] 16,874  
Gross Unrealized Gain [2] 376  
Gross Unrealized Loss [2] 680  
Fair Value [2] $ 16,570  
[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 September 30, 2018, the non-credit portion of OTTI recorded in AOCL was $8.6 million before taxes.