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Investment Securities (Securities With Other-Than-Temporary-Impairment, Cumulative Other-Than-Temporary-Impairment) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Amortized Cost $ 2,205,989 $ 25,678 $ 2,030,801    
Amount of other-than-temporary-impairment recognized in earnings 96 299      
Total other-than-temporary-impairment recognized in earnings 96 299 1,409 3,927 24,795
Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Amortized Cost 63,151        
Amount of other-than-temporary-impairment recognized in earnings 96   521 2,997 4,429
Pooled Trust Preferred Securities Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Amortized Cost 11,208        
Amount of other-than-temporary-impairment recognized in earnings 0   888 930 20,366
BAFC Ser 4 [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Vintage 2007        
Lowest Credit Rating CCC [1]        
Amortized Cost 13,754        
Amount of other-than-temporary-impairment recognized in earnings 76   0 79 63
CWALT Ser 73CB 1 [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Vintage 2005        
Lowest Credit Rating CC [1]        
Amortized Cost 2,963        
Amount of other-than-temporary-impairment recognized in earnings 0   0 207 83
CWALT Ser 73CB 2 [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Vintage 2005        
Lowest Credit Rating CC [1]        
Amortized Cost 4,087        
Amount of other-than-temporary-impairment recognized in earnings 0   0 427 182
CWHL 2006-10 [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Vintage 2006 [2]        
Amount of other-than-temporary-impairment recognized in earnings 0 [2]   0 [2] 309 [2] 762 [2]
CWHL 2005-20 [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Vintage 2005        
Lowest Credit Rating CC [1]        
Amortized Cost 3,168        
Amount of other-than-temporary-impairment recognized in earnings 0   0 39 72
FHASI Ser 4 [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Vintage 2007        
Lowest Credit Rating C [1]        
Amortized Cost 17,885        
Amount of other-than-temporary-impairment recognized in earnings 0   340 629 223
HALO Ser 1R [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Vintage 2006        
Lowest Credit Rating B [1]        
Amortized Cost 15,636        
Amount of other-than-temporary-impairment recognized in earnings 4   16 0 0
RFMSI Ser S9 [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Vintage 2006 [3]        
Amount of other-than-temporary-impairment recognized in earnings 0 [3]   0 [3] 923 [3] 1,880 [3]
RFMSI Ser S10 [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Vintage 2006        
Lowest Credit Rating D [1]        
Amortized Cost 3,762        
Amount of other-than-temporary-impairment recognized in earnings 16   165 76 249
RALI QS2 [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Vintage 2006 [3]        
Amount of other-than-temporary-impairment recognized in earnings 0 [3]   0 [3] 278 [3] 739 [3]
RFMSI S1 [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Vintage 2006        
Lowest Credit Rating CC [1]        
Amortized Cost 1,896        
Amount of other-than-temporary-impairment recognized in earnings 0   0 30 176
TROPC [Member] | Pooled Trust Preferred Securities Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Vintage 2003        
Lowest Credit Rating C [1]        
Amortized Cost 87        
Amount of other-than-temporary-impairment recognized in earnings 0   888 444 3,517
MM Community Funding IX [Member] | Pooled Trust Preferred Securities Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Vintage 2003        
Lowest Credit Rating D [1]        
Amortized Cost 2,067        
Amount of other-than-temporary-impairment recognized in earnings 0   0 165 2,612
Reg Div Funding 2004 [Member] | Pooled Trust Preferred Securities Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Vintage 2004        
Lowest Credit Rating D [1]        
Amortized Cost 4,177        
Amount of other-than-temporary-impairment recognized in earnings 0   0 321 5,199
Pretsl XII [Member] | Pooled Trust Preferred Securities Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Vintage 2003        
Lowest Credit Rating C [1]        
Amortized Cost 2,871        
Amount of other-than-temporary-impairment recognized in earnings 0   0 0 1,897
Pretsl XV [Member] | Pooled Trust Preferred Securities Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Vintage 2004        
Lowest Credit Rating C [1]        
Amortized Cost 1,695        
Amount of other-than-temporary-impairment recognized in earnings 0   0 0 3,374
Reg Div Funding 2005 [Member] | Pooled Trust Preferred Securities Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Vintage 2005        
Lowest Credit Rating C [1]        
Amortized Cost 311        
Amount of other-than-temporary-impairment recognized in earnings 0   0 0 3,767
Life To Date [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Total other-than-temporary-impairment recognized in earnings 30,227        
Life To Date [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Life-to-date 8,043        
Life To Date [Member] | Pooled Trust Preferred Securities Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Life-to-date 22,184        
Life To Date [Member] | BAFC Ser 4 [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Life-to-date 218        
Life To Date [Member] | CWALT Ser 73CB 1 [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Life-to-date 290        
Life To Date [Member] | CWALT Ser 73CB 2 [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Life-to-date 609        
Life To Date [Member] | CWHL 2006-10 [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Life-to-date 1,071 [2]        
Life To Date [Member] | CWHL 2005-20 [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Life-to-date 111        
Life To Date [Member] | FHASI Ser 4 [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Life-to-date 1,192        
Life To Date [Member] | HALO Ser 1R [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Life-to-date 20        
Life To Date [Member] | RFMSI Ser S9 [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Life-to-date 2,803 [3]        
Life To Date [Member] | RFMSI Ser S10 [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Life-to-date 506        
Life To Date [Member] | RALI QS2 [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Life-to-date 1,017 [3]        
Life To Date [Member] | RFMSI S1 [Member] | Mortgage-Backed Securities - Non-Agency Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Life-to-date 206        
Life To Date [Member] | TROPC [Member] | Pooled Trust Preferred Securities Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Life-to-date 4,849        
Life To Date [Member] | MM Community Funding IX [Member] | Pooled Trust Preferred Securities Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Life-to-date 2,777        
Life To Date [Member] | Reg Div Funding 2004 [Member] | Pooled Trust Preferred Securities Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Life-to-date 5,520        
Life To Date [Member] | Pretsl XII [Member] | Pooled Trust Preferred Securities Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Life-to-date 1,897        
Life To Date [Member] | Pretsl XV [Member] | Pooled Trust Preferred Securities Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Life-to-date 3,374        
Life To Date [Member] | Reg Div Funding 2005 [Member] | Pooled Trust Preferred Securities Group 2 [Member]
         
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Life-to-date $ 3,767        
[1] Lowest rating for the security provided by any nationally recognized credit rating agency.
[2] Sold during first quarter 2011.
[3] Sold during fourth quarter 2010.