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Summary of Held-to-Maturity and Available-for-Sale Securities Having Continuous Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value $ 483,559 $ 36,385
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 2,177 1,049
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value 32,396 5,241
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss 11,319 2,217
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 515,955 41,626
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 13,496 3,266
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss [1]   16,190
Debt Securities    
Schedule of Investments [Line Items]    
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 219,080 7,326
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 1,014 460
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 219,080 7,326
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 1,014 460
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 | Capital trust notes    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value 32,396 5,241
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss 11,319 2,217
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 32,396 5,241
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 11,319 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
Debt Securities | GSE CMOs    
Schedule of Investments [Line Items]    
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 199,992  
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 29  
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 199,992  
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 29  
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 52,876  
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 939  
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 52,876  
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 939  
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
Equity securities    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value 11,611 29,059
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 195 589
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 11,611 29,059
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss $ 195 $ 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).