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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, 2016
Dec. 31, 2015
Schedule of Investments [Line Items]    
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss $ 16,190 [1] $ 29,331 [2]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value 36,385 105,702
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 1,049 356
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value 5,241 4,997
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss 2,217 2,448
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 41,626 110,699
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 3,266 2,804
Debt Securities    
Schedule of Investments [Line Items]    
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value 581,856 923,130
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss 4,318 6,876
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Fair Value 24,364 1,201,558
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Unrealized Loss 11,872 22,455
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value 606,220 2,124,688
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss 16,190 29,331
Debt Securities | GSE certificates    
Schedule of Investments [Line Items]    
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value 268,891 299,019
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss 2,399 4,608
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Fair Value   3,899
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Unrealized Loss   114
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value 268,891 302,918
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss 2,399 4,722
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value 7,326 51,959
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 460 1
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 7,326 51,959
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 460 1
Debt Securities | Capital trust notes    
Schedule of Investments [Line Items]    
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value   24,601
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss   399
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Fair Value 24,364 20,710
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Unrealized Loss 11,872 15,501
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value 24,364 45,311
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss 11,872 15,900
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value   1,968
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss   32
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value 5,241 4,997
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss 2,217 2,448
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 5,241 6,965
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 2,217 2,480
Debt Securities | GSE CMOs    
Schedule of Investments [Line Items]    
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value 42,980 9,943
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss 57 57
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value 42,980 9,943
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss 57 57
Debt Securities | U.S. Treasury obligations    
Schedule of Investments [Line Items]    
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 Held-to-Maturity Securities, Less than Twelve Months Fair Value 69,765 42,083
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss 1,789 1,084
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value 69,765 42,083
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss 1,789 1,084
Debt Securities | GSE debentures    
Schedule of Investments [Line Items]    
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value   547,484
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss   728
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Fair Value   1,176,949
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Unrealized Loss   6,840
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value   1,724,433
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss   7,568
Equity securities    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value 29,059 51,775
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 589 323
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 29,059 51,775
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss $ 589 $ 323
[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).
[2] 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, 2015, the non-credit portion of OTTI recorded in AOCL was $8.7 million (before taxes).