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Summary of Portfolio of Securities Available for Sale and Equity Investments with Readily Determinable Fair Values (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 4,167,877 $ 3,464,279 [1]
Gross Unrealized Gain 35,116 81,594 [1]
Gross Unrealized Loss 48,344 14,446 [1]
Fair Value 4,154,649 3,531,427 [1]
Mortgage-Related Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,595,384 2,559,961
Gross Unrealized Gain 17,062 60,810
Gross Unrealized Loss 29,258 2,025
Fair Value 2,583,188 2,618,746
Mortgage-Related Securities | GSE certificates    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,936,949 2,023,677
Gross Unrealized Gain 11,307 46,364
Gross Unrealized Loss 24,840 1,199
Fair Value 1,923,416 2,068,842
Mortgage-Related Securities | GSE CMOs    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 658,435 536,284
Gross Unrealized Gain 5,755 14,446
Gross Unrealized Loss 4,418 826
Fair Value 659,772 549,904
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 1,540,327  
Gross Unrealized Gain 17,708  
Gross Unrealized Loss 18,340  
Fair Value 1,539,695  
Debt Securities | U.S. Treasury obligations    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 199,839  
Gross Unrealized Loss 143  
Fair Value 199,696  
Debt Securities | GSE debentures    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 562,866  
Gross Unrealized Gain 929  
Gross Unrealized Loss 9,146  
Fair Value 554,649  
Debt Securities | Municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 69,546  
Gross Unrealized Gain 178  
Gross Unrealized Loss 2,119  
Fair Value 67,605  
Debt Securities | Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 379,069  
Gross Unrealized Gain 9,922  
Gross Unrealized Loss 898  
Fair Value 388,093  
Debt Securities | Capital trust notes    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 48,252  
Gross Unrealized Gain 6,478  
Gross Unrealized Loss 5,876  
Fair Value 48,854  
Debt Securities | Asset backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost [3] 280,755  
Gross Unrealized Gain [3] 201  
Gross Unrealized Loss [3] 158  
Fair Value [3] 280,798  
Mortgage Backed Securities And Other Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost [4] 4,135,711  
Gross Unrealized Gain [4] 34,770  
Gross Unrealized Loss [4] 47,598  
Fair Value [4] 4,122,883  
Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 32,166  
Gross Unrealized Gain 346  
Gross Unrealized Loss 746  
Fair Value 31,766  
Equity securities | Preferred stock    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 15,292  
Gross Unrealized Loss 184  
Fair Value 15,108  
Equity securities | Mutual Funds and Common Stock    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost [5] 16,874  
Gross Unrealized Gain [5] 346  
Gross Unrealized Loss [5] 562  
Fair Value [5] $ 16,658  
[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] Asset-backed securities are substantially U.S. Government guaranteed.
[4] The amortized cost includes the non-credit portion of OTTI recorded in AOCL. At June 30, 2018, the non-credit portion of OTTI recorded in AOCL was $8.6 million before taxes.
[5] Primarily consists of mutual funds that are CRA-qualified investments.