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Summary of Held-to-Maturity and Available-for-Sale Securities Having Continuous Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Schedule of Investments [Line Items]    
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss $ 16,748 [1] $ 29,331 [2]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value 16,997 105,702
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 295 356
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value 4,861 4,997
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss 2,587 2,448
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 21,858 110,699
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 2,882 2,804
Debt Securities    
Schedule of Investments [Line Items]    
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value 32,522 923,130
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss 261 6,876
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Fair Value 24,839 1,201,558
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Unrealized Loss 16,487 22,455
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value 57,361 2,124,688
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss 16,748 29,331
Debt Securities | Capital trust notes    
Schedule of Investments [Line Items]    
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value 24,753 24,601
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss 247 399
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Fair Value 19,770 20,710
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Unrealized Loss 16,447 15,501
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value 44,523 45,311
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss 16,694 15,900
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value 1,980 1,968
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 20 32
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value 4,861 4,997
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss 2,587 2,448
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 6,841 6,965
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 2,607 2,480
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
Debt Securities | GSE certificates    
Schedule of Investments [Line Items]    
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value 7,769 299,019
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss 14 4,608
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Fair Value 5,069 3,899
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Unrealized Loss 40 114
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value 12,838 302,918
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss 54 4,722
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value   51,959
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss   1
Temporarily Impaired Available-for-Sale Securities, Total Fair Value   51,959
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss   1
Debt Securities | Municipal bonds    
Schedule of Investments [Line Items]    
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value   42,083
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss   1,084
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value   42,083
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss   1,084
Debt Securities | GSE CMOs    
Schedule of Investments [Line Items]    
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value   9,943
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss   57
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value   9,943
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss   57
Equity securities    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value 15,017 51,775
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 275 323
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 15,017 51,775
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss $ 275 $ 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 Accumulated Other Comprehensive Loss ("AOCL"). At March 31, 2016, the non-credit portion of OTTI recorded in AOCL was $8.7 million, pre-tax.
[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, pre-tax.