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Investment Securities (Schedule of Preferred Security and Associated Ratings) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Countrywide Capital IV [Member]
item
Mar. 31, 2013
Countrywide Capital IV [Member]
Standard & Poor's, BB+ Rating [Member]
Mar. 31, 2013
Countrywide Capital V [Member]
item
Mar. 31, 2013
Countrywide Capital V [Member]
Standard & Poor's, BB+ Rating [Member]
Mar. 31, 2013
Countrywide Capital V [Member]
Additional Deal Value [Member]
item
Mar. 31, 2013
Countrywide Capital V [Member]
Additional Deal Value [Member]
Standard & Poor's, BB+ Rating [Member]
Mar. 31, 2013
Citigroup Cap IX [Member]
item
Mar. 31, 2013
Citigroup Cap IX [Member]
Additional Deal Value [Member]
item
Mar. 31, 2013
Citigroup Cap IX [Member]
Additional Deal Value [Member]
Standard & Poor's, BB Rating [Member]
Mar. 31, 2013
Citigroup Cap XI [Member]
item
Mar. 31, 2013
Citigroup Cap XI [Member]
Standard & Poor's, BB Rating [Member]
Mar. 31, 2013
Nationsbank Cap Trust III [Member]
item
Mar. 31, 2013
Nationsbank Cap Trust III [Member]
Standard & Poor's, BB+ Rating [Member]
Mar. 31, 2013
Morgan Stanley Cap Trust IV [Member]
item
Mar. 31, 2013
Morgan Stanley Cap Trust IV [Member]
Standard & Poor's, BB+ Rating [Member]
Mar. 31, 2013
Morgan Stanley Cap Trust IV [Member]
Additional Deal Value [Member]
item
Mar. 31, 2013
Morgan Stanley Cap Trust IV [Member]
Additional Deal Value [Member]
Standard & Poor's, BB+ Rating [Member]
Mar. 31, 2013
Saturns - GS 2004-06 [Member]
item
Mar. 31, 2013
Saturns - GS 2004-06 [Member]
Standard & Poor's, BB+ Rating [Member]
Mar. 31, 2013
Saturns - GS 2004-06 [Member]
Additional Deal Value [Member]
item
Mar. 31, 2013
Saturns - GS 2004-06 [Member]
Additional Deal Value [Member]
Standard & Poor's, BB+ Rating [Member]
Mar. 31, 2013
Saturns - GS 2004-04 [Member]
item
Mar. 31, 2013
Saturns - GS 2004-04 [Member]
Standard & Poor's, BB+ Rating [Member]
Mar. 31, 2013
Saturns - GS 2004-04 [Member]
Additional Deal Value [Member]
item
Mar. 31, 2013
Saturns - GS 2004-04 [Member]
Additional Deal Value [Member]
Standard & Poor's, BB+ Rating [Member]
Mar. 31, 2013
Goldman Sachs [Member]
item
Mar. 31, 2013
Goldman Sachs [Member]
Standard & Poor's, BB+ Rating [Member]
Mar. 31, 2013
Stifel Financial [Member]
item
Mar. 31, 2013
ALESCO Preferred Funding VII [Member]
Mar. 31, 2013
ALESCO Preferred Funding VII [Member]
Ca Rating [Member]
Mar. 31, 2013
ALESCO Preferred Funding VII [Member]
Maximum [Member]
item
Mar. 31, 2013
ALESCO Preferred Funding VII [Member]
Minimum [Member]
item
Schedule of Investments [Line Items]                                                                    
Available-for-sale Securities, Amortized Cost Basis $ 443,400 $ 482,440 $ 1,770   $ 250   $ 2,747   $ 992 $ 1,905   $ 246   $ 1,572   $ 2,500   $ 1,742   $ 243   $ 313   $ 781   $ 22   $ 999   $ 4,500 $ 845      
Available-for-sale Securities, Gross Unrealized Gain (Loss) 16,584 16,316 36   6   61   29 66   7   (327)   13   16   5   7   17       46   180 (801)      
Investment Securities Available-for-Sale: Fair Value $ 458,004 $ 496,815 $ 1,806   $ 256   $ 2,808   $ 1,021 $ 1,971   $ 253   $ 1,245   $ 2,513   $ 1,758   $ 248   $ 320   $ 798   $ 22   $ 1,045   $ 4,680 $ 44      
Debt Instrument, Credit Rating       BB+   BB+   BB+ BB   BB   BB   BB+   BB+   BB+   BB+   BB+   BB+   BB+   BB+ BBB-   Ca    
Number of banks currently performing     1   1   1   1 1   1   1   1   1   1   1   1   1   1   1     61 47
Deferral and Defaults as a percentage of collateral                                                             35.90%      
Expected deferral default as a percent of remaining performing colleteral                                                             44.50%