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Investment Securities (Summary Of Gross Unrealized Losses Not Considered OTTI) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Schedule of Investments [Line Items]    
Available for Sale, Fair Value - Less Than Twelve Months $ 582,287 $ 487,944
Available for Sale, Unrealized Losses - Less Than Twelve Months (15,146) (8,151)
Available for Sale, Fair Value - Twelve Months or Longer 68,932 138,377
Available for Sale, Unrealized Losses - Twelve Months or Longer (36,040) (25,097)
Available for Sale, # of Holdings, Total 37 45
Available for Sale, Fair Value - Total 651,219 626,321
Available for Sale, Unrealized Losses - Total (51,186) (33,248)
Held-to-maturity, Fair Value - Less Than Twelve Months 5,405 710,950
Held-to-maturity, Unrealized Losses - Less Than Twelve Months (66) (28,399)
Held-to-maturity, Fair Value - Twelve Months or Longer 6,117 11,737
Held-to-maturity, Unrealized Losses - Twelve Months or Longer (108) (1,578)
Held-to-maturity, # of Holdings, Total 21 422
Held-to-maturity, Fair Value - Total 11,522 722,687
Held-to-maturity, Unrealized Losses - Total (174) (29,977)
Total investment securities - Fair Value, Less Than Twelve Months 587,692 1,198,894
Total investment securities - Unrealized Losses, Less Than Twelve Months (15,212) (36,550)
Total investment securities - Fair Value Twelve Months or Longer 75,049 150,114
Total investment securities - Unrealized Losses Twelve Months or Longer (36,148) (26,675)
Total investment securities, # of Holdings 58 467
Fair value of investment securities 662,741 1,349,008
Total investment securities - Unrealized Losses (51,360) (63,225)
Agency CMOs - GSE [Member]
   
Schedule of Investments [Line Items]    
Available for Sale, Fair Value - Less Than Twelve Months 405,318 450,099
Available for Sale, Unrealized Losses - Less Than Twelve Months (3,341) (6,307)
Available for Sale, # of Holdings, Total 11 9
Available for Sale, Fair Value - Total 405,318 450,099
Available for Sale, Unrealized Losses - Total (3,341) (6,307)
Held-to-maturity, Fair Value - Less Than Twelve Months   51,874
Held-to-maturity, Unrealized Losses - Less Than Twelve Months   (515)
Held-to-maturity, # of Holdings, Total   1
Held-to-maturity, Fair Value - Total   51,874
Held-to-maturity, Unrealized Losses - Total   (515)
Pooled Trust Preferred Securities [Member]
   
Schedule of Investments [Line Items]    
Available for Sale, Fair Value - Less Than Twelve Months 6,526 8,126
Available for Sale, Unrealized Losses - Less Than Twelve Months (8,178) (1,534)
Available for Sale, Fair Value - Twelve Months or Longer 22,472 40,147
Available for Sale, Unrealized Losses - Twelve Months or Longer (15,430) (13,024)
Available for Sale, # of Holdings, Total 8 9
Available for Sale, Fair Value - Total 28,998 48,273
Available for Sale, Unrealized Losses - Total (23,608) (14,558)
Fair value of investment securities 29,000 53,200
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 31,503 42,275
Available for Sale, Unrealized Losses - Twelve Months or Longer (11,292) (8,577)
Available for Sale, # of Holdings, Total 9 9
Available for Sale, Fair Value - Total 38,214 42,275
Available for Sale, Unrealized Losses - Total (12,813) (8,577)
Fair value of investment securities 38,200 42,300
Equity Securities - Financial Institutions [Member]
   
Schedule of Investments [Line Items]    
Available for Sale, Fair Value - Less Than Twelve Months 124 1,328
Available for Sale, Unrealized Losses - Less Than Twelve Months (24) (222)
Available for Sale, Fair Value - Twelve Months or Longer   138
Available for Sale, Unrealized Losses - Twelve Months or Longer   (11)
Available for Sale, # of Holdings, Total 1 14
Available for Sale, Fair Value - Total 124 1,466
Available for Sale, Unrealized Losses - Total (24) (233)
Commercial Mortgage-Backed Securities (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 14,957 55,817
Available for Sale, Unrealized Losses - Twelve Months or Longer (9,318) (3,485)
Available for Sale, # of Holdings, Total 5 3
Available for Sale, Fair Value - Total 88,147 55,817
Available for Sale, Unrealized Losses - Total (11,242) (3,485)
Mortgage-Backed Securities- GSE [Member]
   
Schedule of Investments [Line Items]    
Available for Sale, Fair Value - Less Than Twelve Months 90,418 28,391
Available for Sale, Unrealized Losses - Less Than Twelve Months (158) (88)
Available for Sale, # of Holdings, Total 3 1
Available for Sale, Fair Value - Total 90,418 28,391
Available for Sale, Unrealized Losses - Total (158) (88)
Held-to-maturity, Fair Value - Less Than Twelve Months   301,305
Held-to-maturity, Unrealized Losses - Less Than Twelve Months   (4,263)
Held-to-maturity, # of Holdings, Total   11
Held-to-maturity, Fair Value - Total   301,305
Held-to-maturity, Unrealized Losses - Total   (4,263)
Municipal Bonds And Notes [Member]
   
Schedule of Investments [Line Items]    
Held-to-maturity, Fair Value - Less Than Twelve Months 5,405 357,771
Held-to-maturity, Unrealized Losses - Less Than Twelve Months (66) (23,621)
Held-to-maturity, Fair Value - Twelve Months or Longer 6,117 11,737
Held-to-maturity, Unrealized Losses - Twelve Months or Longer (108) (1,578)
Held-to-maturity, # of Holdings, Total 21 410
Held-to-maturity, Fair Value - Total 11,522 369,508
Held-to-maturity, Unrealized Losses - Total $ (174) $ (25,199)