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Investment Securities (Schedule of Investment Ratings) (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Countrywide Capital IV [Member]
Jun. 30, 2012
Countrywide Capital V [Member]
Jun. 30, 2012
Countrywide Capital V [Member]
Additional Deal Value [Member]
Jun. 30, 2012
NPB Capital Trust II [Member]
Jun. 30, 2012
Citigroup Cap IX [Member]
Jun. 30, 2012
Citigroup Cap IX [Member]
Additional Deal Value [Member]
Jun. 30, 2012
Citigroup Cap XI [Member]
Jun. 30, 2012
BAC Capital Trust X [Member]
Jun. 30, 2012
Nationsbank Cap Trust III [Member]
Jun. 30, 2012
Morgan Stanley Cap Trust IV [Member]
Jun. 30, 2012
Morgan Stanley Cap Trust IV [Member]
Additional Deal Value [Member]
Jun. 30, 2012
Saturns - GS 2004-06 [Member]
Jun. 30, 2012
Saturns - GS 2004-06 [Member]
Additional Deal Value [Member]
Jun. 30, 2012
Saturns - GS 2004-04 [Member]
Jun. 30, 2012
Saturns - GS 2004-04 [Member]
Additional Deal Value [Member]
Jun. 30, 2012
Goldman Sachs [Member]
Jun. 30, 2012
ALESCO Preferred Funding VI [Member]
Jun. 30, 2012
ALESCO Preferred Funding VI [Member]
Maximum [Member]
Jun. 30, 2012
ALESCO Preferred Funding VI [Member]
Minimum [Member]
Jun. 30, 2012
ALESCO Preferred Funding VII [Member]
Jun. 30, 2012
ALESCO Preferred Funding VII [Member]
Maximum [Member]
Jun. 30, 2012
ALESCO Preferred Funding VII [Member]
Minimum [Member]
Schedule of Investments [Line Items]                                                
Available-for-sale Securities, Amortized Cost Basis $ 462,700 $ 417,939 $ 1,770 $ 2,747 $ 250 $ 868 $ 992 $ 1,904 $ 246 $ 2,500 $ 1,571 $ 2,500 $ 1,742 $ 242 $ 312 $ 780 $ 22 $ 1,000 $ 325     $ 839    
Available-for-sale Securities, Gross Unrealized Gain (Loss) (9,561) (6,714) (23) (16) (2) 26 (12) (13) (2) 8 (446) (120) (77) 2 2 5   (58) (256)     (803)    
Investment Securities Available-for-Sale: Fair Value $ 467,190 $ 414,507 $ 1,747 $ 2,731 $ 248 $ 894 $ 980 $ 1,891 $ 244 $ 2,508 $ 1,125 $ 2,380 $ 1,665 $ 244 $ 314 $ 785 $ 22 $ 942 $ 69     $ 36    
Number of banks currently performing     1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1   56 36   62 48
Deferral and Defaults as a percentage of collateral                                     36.10%     35.90%    
Expected deferral default as a percent of remaining performing colleteral                                     46.70%     47.70%