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Investment Securities (Summary Of Gross Unrealized Losses Not Considered OTTI) (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
holding
Dec. 31, 2011
holding
Schedule of Investments [Line Items]    
Available for Sale, Fair Value - Less Than Twelve Months $ 178,547 $ 582,287
Available for Sale, Unrealized Losses - Less Than Twelve Months (923) (15,146)
Available for Sale, Fair Value - Twelve Months or Longer 90,129 68,932
Available for Sale, Unrealized Losses - Twelve Months or Longer (34,958) (36,040)
Available for Sale, # of Holdings - Total 31 37
Available for Sale, Fair Value - Total 268,676 651,219
Available for Sale, Unrealized Losses - Total (35,881) (51,186)
Total investment securities, Fair Value - Less Than Twelve Months 218,058 587,692
Total investment securities - Unrealized Losses, Less Than Twelve Months (1,135) (15,212)
Total investment securities - Fair Value, Twelve Months or Longer 94,671 75,049
Total investment securities, Unrealized Losses - Twelve Months or Longer (35,037) (36,148)
Total investment securities, # of Holdings - Total 54 58
Total investment securities - Fair value - Total 312,729 662,741
Total investment securities - Unrealized Losses - Total (36,172) (51,360)
Held-to-maturity, Fair Value - Less Than Twelve Months 39,511 5,405
Held-to-maturity, Unrealized Losses - Less Than Twelve Months (212) (66)
Held-to-maturity, Fair Value - Twelve Months or Longer 4,542 6,117
Held-to-maturity, Unrealized Losses - Twelve Months or Longer (79) (108)
Held-to-maturity, # of Holdings - Total 23 21
Held-to-maturity, Fair Value - Total 44,053 11,522
Held-to-maturity, Unrealized Losses - Total (291) (174)
Agency CMOs - GSE [Member]
   
Schedule of Investments [Line Items]    
Available for Sale, Fair Value - Less Than Twelve Months 118,266 405,318
Available for Sale, Unrealized Losses - Less Than Twelve Months (275) (3,341)
Available for Sale, Fair Value - Twelve Months or Longer    0
Available for Sale, Unrealized Losses - Twelve Months or Longer      
Available for Sale, # of Holdings - Total 6 11
Available for Sale, Fair Value - Total 118,266 405,318
Available for Sale, Unrealized Losses - Total (275) (3,341)
Pooled Trust Preferred Securities [Member]
   
Schedule of Investments [Line Items]    
Available for Sale, Fair Value - Less Than Twelve Months    6,526
Available for Sale, Unrealized Losses - Less Than Twelve Months    (8,178)
Available for Sale, Fair Value - Twelve Months or Longer 28,253 22,472
Available for Sale, Unrealized Losses - Twelve Months or Longer (21,330) (15,430)
Available for Sale, # of Holdings - Total 8 8
Available for Sale, Fair Value - Total 28,253 28,998
Available for Sale, Unrealized Losses - Total (21,330) (23,608)
Total investment securities - Fair value - Total 28,300 29,000
Single Issuer Trust Preferred Securities [Member]
   
Schedule of Investments [Line Items]    
Available for Sale, Fair Value - Less Than Twelve Months    6,711
Available for Sale, Unrealized Losses - Less Than Twelve Months    (1,521)
Available for Sale, Fair Value - Twelve Months or Longer 41,420 31,503
Available for Sale, Unrealized Losses - Twelve Months or Longer (9,724) (11,292)
Available for Sale, # of Holdings - Total 9 9
Available for Sale, Fair Value - Total 41,420 38,214
Available for Sale, Unrealized Losses - Total (9,724) (12,813)
Total investment securities - Fair value - Total 41,400 38,200
Equity Securities - Financial Institutions [Member]
   
Schedule of Investments [Line Items]    
Available for Sale, Fair Value - Less Than Twelve Months 129 124
Available for Sale, Unrealized Losses - Less Than Twelve Months (20) (24)
Available for Sale, Fair Value - Twelve Months or Longer      
Available for Sale, Unrealized Losses - Twelve Months or Longer      
Available for Sale, # of Holdings - Total 1 1
Available for Sale, Fair Value - Total 129 124
Available for Sale, Unrealized Losses - Total (20) (24)
Mortgage-Backed Securities [Member]
   
Schedule of Investments [Line Items]    
Available for Sale, Fair Value - Less Than Twelve Months 60,152 90,418
Available for Sale, Unrealized Losses - Less Than Twelve Months (628) (158)
Available for Sale, Fair Value - Twelve Months or Longer      
Available for Sale, Unrealized Losses - Twelve Months or Longer      
Available for Sale, # of Holdings - Total 6 3
Available for Sale, Fair Value - Total 60,152 90,418
Available for Sale, Unrealized Losses - Total (628) (158)
Held-to-maturity, Fair Value - Less Than Twelve Months 15,563  
Held-to-maturity, Unrealized Losses - Less Than Twelve Months (37)  
Held-to-maturity, Fair Value - Twelve Months or Longer     
Held-to-maturity, Unrealized Losses - Twelve Months or Longer     
Held-to-maturity, # of Holdings - Total 3  
Held-to-maturity, Fair Value - Total 15,563  
Held-to-maturity, Unrealized Losses - Total (37)  
CMBS [Member]
   
Schedule of Investments [Line Items]    
Available for Sale, Fair Value - Less Than Twelve Months    73,190
Available for Sale, Unrealized Losses - Less Than Twelve Months    (1,924)
Available for Sale, Fair Value - Twelve Months or Longer 20,456 14,957
Available for Sale, Unrealized Losses - Twelve Months or Longer (3,904) (9,318)
Available for Sale, # of Holdings - Total 1 5
Available for Sale, Fair Value - Total 20,456 88,147
Available for Sale, Unrealized Losses - Total (3,904) (11,242)
Held-to-maturity, Fair Value - Less Than Twelve Months 15,789  
Held-to-maturity, Unrealized Losses - Less Than Twelve Months (76)  
Held-to-maturity, Fair Value - Twelve Months or Longer     
Held-to-maturity, Unrealized Losses - Twelve Months or Longer     
Held-to-maturity, # of Holdings - Total 1  
Held-to-maturity, Fair Value - Total 15,789  
Held-to-maturity, Unrealized Losses - Total (76)  
Municipal Bonds And Notes [Member]
   
Schedule of Investments [Line Items]    
Held-to-maturity, Fair Value - Less Than Twelve Months 8,159 5,405
Held-to-maturity, Unrealized Losses - Less Than Twelve Months (99) (66)
Held-to-maturity, Fair Value - Twelve Months or Longer 4,542 6,117
Held-to-maturity, Unrealized Losses - Twelve Months or Longer (79) (108)
Held-to-maturity, # of Holdings - Total 19 21
Held-to-maturity, Fair Value - Total 12,701 11,522
Held-to-maturity, Unrealized Losses - Total $ (178) $ (174)