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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, 2017
Dec. 31, 2016
Schedule of Investments [Line Items]    
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss $ 13,070 $ 16,190 [1]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value 23,324 36,385
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 781 1,049
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value 5,441 5,241
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss 2,021 2,217
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 28,765 41,626
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 2,802 3,266
Debt Securities    
Schedule of Investments [Line Items]    
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value 573,148 581,856
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss 3,174 4,318
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Fair Value 26,346 24,364
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Unrealized Loss 9,896 11,872
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value 599,494 606,220
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss 13,070 16,190
Debt Securities | GSE certificates    
Schedule of Investments [Line Items]    
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value 236,364 268,891
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss 1,078 2,399
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value 236,364 268,891
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss 1,078 2,399
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value 7,303 7,326
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 445 460
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 7,303 7,326
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 445 460
Debt Securities | Capital trust notes    
Schedule of Investments [Line Items]    
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value 24,701  
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss 300  
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Fair Value 26,346 24,364
Temporarily Impaired Held-to-Maturity Securities, Twelve Months or Longer Unrealized Loss 9,896 11,872
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value 51,047 24,364
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss 10,196 11,872
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value 1,976  
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 25  
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value 5,441 5,241
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss 2,021 2,217
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 7,417 5,241
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 2,046 2,217
Debt Securities | GSE CMOs    
Schedule of Investments [Line Items]    
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value 65,374 42,980
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss 219 57
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value 65,374 42,980
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss 219 57
Debt Securities | U.S. Treasury obligations    
Schedule of Investments [Line Items]    
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value 200,055 200,220
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss 103 73
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value 200,055 200,220
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss 103 73
Debt Securities | Municipal bonds    
Schedule of Investments [Line Items]    
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Fair Value 46,654 69,765
Temporarily Impaired Held-to-Maturity Securities, Less than Twelve Months Unrealized Loss 1,474 1,789
Temporarily Impaired Held-to-Maturity Securities, Total Fair Value 46,654 69,765
Temporarily Impaired Held-to-Maturity Securities, Total Unrealized Loss 1,474 1,789
Equity securities    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value 14,045 29,059
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 311 589
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 14,045 29,059
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss $ 311 $ 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).