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Fair Value Accounting (Financial Instruments Measured At Fair Value On A Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities $ 12,331 $ 16,866
Investment securities available for sale 3,570,346 3,690,125
Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 0  
Investment securities available for sale 3,102  
Private equity investments 0  
Derivative assets 0  
Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 12,331  
Investment securities available for sale 3,562,141  
Private equity investments 861  
Derivative assets 78,358  
Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 0  
Investment securities available for sale 5,103  
Private equity investments 29,847  
Derivative assets 0  
Fair Value, Measurements, Recurring [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 12,331 16,866
Mortgage loans held for sale 120,007 161,509
Investment securities available for sale 3,570,346 3,690,125
Private equity investments 30,708 22,015
Mutual funds held in Rabbi Trusts 10,114 10,353
Derivative assets 78,358 84,923
Trading securities, liability 766  
Derivative liabilities 80,906 96,574
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 0 0
Mortgage loans held for sale 0 0
Investment securities available for sale 3,102 2,792
Private equity investments 0 0
Mutual funds held in Rabbi Trusts 10,114 10,353
Derivative assets 0 0
Trading securities, liability 0  
Derivative liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 12,331 16,866
Mortgage loans held for sale 120,007 161,509
Investment securities available for sale 3,562,141 3,680,491
Private equity investments 861 597
Mutual funds held in Rabbi Trusts 0 0
Derivative assets   83,072
Trading securities, liability 766  
Derivative liabilities 77,856 87,481
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 0 0
Mortgage loans held for sale 0 0
Investment securities available for sale 5,103 6,842
Private equity investments 29,847 21,418
Mutual funds held in Rabbi Trusts 0 0
Derivative assets 0 1,851
Trading securities, liability 0  
Derivative liabilities 3,050 9,093
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities   33
Investment securities available for sale 307 426
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities [Member] | Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities   0
Investment securities available for sale 307 426
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities   33
Investment securities available for sale 0 0
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities [Member] | Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities   0
Investment securities available for sale 0 0
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities Issued By U.S. Government Agencies [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 786  
Investment securities available for sale 280,045 285,753
Trading securities, liability 766  
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities Issued By U.S. Government Agencies [Member] | Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 0  
Investment securities available for sale 0 0
Trading securities, liability 0  
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities Issued By U.S. Government Agencies [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 786  
Investment securities available for sale 280,045 285,753
Trading securities, liability 766  
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities Issued By U.S. Government Agencies [Member] | Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 0  
Investment securities available for sale 0 0
Trading securities, liability 0  
Fair Value, Measurements, Recurring [Member] | Securities Issued By U.S. Government Sponsored Enterprises [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 564,526 675,421
Fair Value, Measurements, Recurring [Member] | Securities Issued By U.S. Government Sponsored Enterprises [Member] | Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 0 0
Fair Value, Measurements, Recurring [Member] | Securities Issued By U.S. Government Sponsored Enterprises [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 564,526 675,421
Fair Value, Measurements, Recurring [Member] | Securities Issued By U.S. Government Sponsored Enterprises [Member] | Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 0 0
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities Issued By U.S. Government Sponsored Enterprises [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 2,056,627 2,002,006
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities Issued By U.S. Government Sponsored Enterprises [Member] | Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 0 0
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities Issued By U.S. Government Sponsored Enterprises [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 2,056,627 2,002,006
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities Issued By U.S. Government Sponsored Enterprises [Member] | Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 0 0
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations Issued By U.S. Government Sponsored Enterprises [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 3,613 4,040
Investment securities available for sale 600,166 651,500
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations Issued By U.S. Government Sponsored Enterprises [Member] | Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 0 0
Investment securities available for sale 0 0
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations Issued By U.S. Government Sponsored Enterprises [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 3,613 4,040
Investment securities available for sale 600,166 651,500
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations Issued By U.S. Government Sponsored Enterprises [Member] | Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 0 0
Investment securities available for sale 0 0
Fair Value, Measurements, Recurring [Member] | Other U.S. Government Agencies [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 39,680 40,493
Fair Value, Measurements, Recurring [Member] | Other U.S. Government Agencies [Member] | Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 0 0
Fair Value, Measurements, Recurring [Member] | Other U.S. Government Agencies [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 39,680 40,493
Fair Value, Measurements, Recurring [Member] | Other U.S. Government Agencies [Member] | Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 0 0
Fair Value, Measurements, Recurring [Member] | State And Municipal Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 461 10
Investment securities available for sale 21,097 25,318
Fair Value, Measurements, Recurring [Member] | State And Municipal Securities [Member] | Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 0 0
Investment securities available for sale 0 0
Fair Value, Measurements, Recurring [Member] | State And Municipal Securities [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 461 10
Investment securities available for sale 21,097 25,318
Fair Value, Measurements, Recurring [Member] | State And Municipal Securities [Member] | Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 0 0
Investment securities available for sale 0 0
Fair Value, Measurements, Recurring [Member] | All Other Residential Mortgage-Backed Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 7,346 11,748
Fair Value, Measurements, Recurring [Member] | All Other Residential Mortgage-Backed Securities [Member] | Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 0 0
Fair Value, Measurements, Recurring [Member] | All Other Residential Mortgage-Backed Securities [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 7,346 11,748
Fair Value, Measurements, Recurring [Member] | All Other Residential Mortgage-Backed Securities [Member] | Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 0 0
Fair Value, Measurements, Recurring [Member] | Equity, Mutual Funds, And Other [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 125 1,035
Fair Value, Measurements, Recurring [Member] | Equity, Mutual Funds, And Other [Member] | Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 0 0
Fair Value, Measurements, Recurring [Member] | Equity, Mutual Funds, And Other [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 125 1,035
Fair Value, Measurements, Recurring [Member] | Equity, Mutual Funds, And Other [Member] | Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 0 0
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 3,686 3,759
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 2,795 2,366
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 0 0
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 891 1,393
Fair Value, Measurements, Recurring [Member] | Other Investments [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 4,212 [1] 5,449 [1]
Fair Value, Measurements, Recurring [Member] | Other Investments [Member] | Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 0 [1] 0 [1]
Fair Value, Measurements, Recurring [Member] | Other Investments [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 0 [1] 0 [1]
Fair Value, Measurements, Recurring [Member] | Other Investments [Member] | Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities available for sale 4,212 [1] 5,449 [1]
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 74,471 83,072
Derivative liabilities 75,761 85,534
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member] | Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 74,471 83,072
Derivative liabilities 75,761 85,534
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member] | Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Mortgage Derivatives [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 3,887 1,851
Derivative liabilities 2,095 1,947
Fair Value, Measurements, Recurring [Member] | Mortgage Derivatives [Member] | Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Mortgage Derivatives [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 3,887 0
Derivative liabilities 2,095 1,947
Fair Value, Measurements, Recurring [Member] | Mortgage Derivatives [Member] | Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 0 1,851
Derivative liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Other Derivative Contracts, Net [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative liabilities 3,050 9,093
Fair Value, Measurements, Recurring [Member] | Other Derivative Contracts, Net [Member] | Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Other Derivative Contracts, Net [Member] | Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Other Derivative Contracts, Net [Member] | Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative liabilities $ 3,050 $ 9,093
[1] Based on an analysis of the nature and risks of these investments, Synovus has determined that presenting these investments as a single asset class is appropriate.