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Summary of Portfolio of Securities Available for Sale and Equity Investments with Readily Determinable Fair Values (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost [1]   $ 3,464,279
Gross Unrealized Gain [1]   81,594
Gross Unrealized Loss [1]   14,446
Fair Value $ 3,391,952 3,531,427 [1]
Amortized Cost 3,412,716  
Gross Unrealized Gain 46,181  
Gross Unrealized Loss 34,876  
Fair Value 3,424,021 3,531,427
Mortgage-Related Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,504,097 2,559,961
Gross Unrealized Gain 27,990 60,810
Gross Unrealized Loss 19,323 2,025
Fair Value 2,512,764 2,618,746
Mortgage-Related Securities | GSE certificates    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,966,476 2,023,677
Gross Unrealized Gain 20,565 46,364
Gross Unrealized Loss 15,864 1,199
Fair Value 1,971,177 2,068,842
Mortgage-Related Securities | GSE CMOs    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 537,621 536,284
Gross Unrealized Gain 7,425 14,446
Gross Unrealized Loss 3,459 826
Fair Value 541,587 549,904
Other Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 876,453 904,318
Gross Unrealized Gain 17,789 20,784
Gross Unrealized Loss 15,054 12,421
Fair Value 879,188 912,681
Other Securities | U.S. Treasury obligations    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 199,678 199,960
Gross Unrealized Loss 248 62
Fair Value 199,430 199,898
Other Securities | GSE debentures    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 478,588 473,879
Gross Unrealized Gain 1,213 2,044
Gross Unrealized Loss 6,732 2,665
Fair Value 473,069 473,258
Other Securities | Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 79,828 79,702
Gross Unrealized Gain 9,890 11,073
Fair Value 89,718 90,775
Other Securities | Municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 70,117 70,381
Gross Unrealized Gain 201 540
Gross Unrealized Loss 1,711 801
Fair Value 68,607 70,120
Other Securities | Capital trust notes    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 48,242 48,230
Gross Unrealized Gain 6,485 6,498
Gross Unrealized Loss 6,363 8,632
Fair Value 48,364 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
Mortgage Backed Securities And Other Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost [3] 3,380,550  
Gross Unrealized Gain [3] 45,779  
Gross Unrealized Loss [3] 34,377  
Fair Value [3] 3,391,952  
Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 32,166  
Gross Unrealized Gain 402  
Gross Unrealized Loss 499  
Fair Value 32,069  
Equity securities | Preferred stock    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 15,292  
Gross Unrealized Loss 49  
Fair Value 15,243  
Equity securities | Mutual Funds and Common Stock    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost [2] 16,874  
Gross Unrealized Gain [2] 402  
Gross Unrealized Loss [2] 450  
Fair Value [2] $ 16,826  
[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 amortized cost includes the non-credit portion of OTTI recorded in AOCL. At March 31, 2018, the non-credit portion of OTTI recorded in AOCL was $8.6 million (before taxes).