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Investment Securities (Schedule of Investment Ratings) (Detail) (USD $) In Thousands, unless otherwise specified |  |  | 6 Months Ended
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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% |  |

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