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Summary of Held-to-Maturity and Available-for-Sale Securities Having Continuous Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value   $ 36,385
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss   1,049
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value   5,241
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss   2,217
Temporarily Impaired Available-for-Sale Securities, Total Fair Value   41,626
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss   3,266
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss [1]   16,190
Debt Securities    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value $ 895,352  
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 4,347  
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value 108,144  
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss 10,099  
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 1,003,496  
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 14,446  
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value   581,856
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss   4,318
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Fair Value   24,364
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Unrealized Loss   11,872
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value   606,220
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss   16,190
Debt Securities | GSE certificates    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value 232,546 7,326
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 535 460
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value 20,440  
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss 664  
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 252,986 7,326
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 1,199 460
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value   268,891
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss   2,399
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value   268,891
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss   2,399
Debt Securities | GSE debentures    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value 333,045  
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 2,665  
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 333,045  
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 2,665  
Debt Securities | GSE CMOs    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value 118,694  
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 826  
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 118,694  
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 826  
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value   42,980
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss   57
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value   42,980
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss   57
Debt Securities | U.S. Treasury obligations    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value 199,898  
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 62  
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 199,898  
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 62  
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value   200,220
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss   73
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value   200,220
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss   73
Debt Securities | Municipal bonds    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value 11,169  
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 259  
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value 41,054  
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss 542  
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 52,223  
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 801  
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value   69,765
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss   1,789
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value   69,765
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss   1,789
Debt Securities | Capital trust notes    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value 35,105 5,241
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss 8,632 2,217
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 35,105 5,241
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 8,632 2,217
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Fair Value   24,364
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Unrealized Loss   11,872
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value   24,364
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss   11,872
Equity securities    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value   29,059
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss   589
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value 11,545  
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss 261  
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 11,545 29,059
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss $ 261 $ 589
[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).