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Securities - Summary of Structured Pooled Trust Preferred Securities (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items] |  |  |
Adjusted Amortized Cost | $ 800 |  |
Unrealized Gain (Loss) | (139) |  |
Fair Value | 661 |  |
Credit Losses Realized in Earnings | 0 | 0 | 398
ALESCO Preferred Funding V, Ltd [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Adjusted Amortized Cost | 800 |  |
Unrealized Gain (Loss) | (139) |  |
Fair Value | 661 |  |
Credit Losses Realized in Earnings | 0 | 0 | 0
ALESCO Preferred Funding XII, Ltd [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Adjusted Amortized Cost | 0 |  |
Unrealized Gain (Loss) | 0 |  |
Fair Value | 0 |  |
Credit Losses Realized in Earnings | 0 | 0 | 280
ALESCO Preferred Funding XVII, Ltd [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Adjusted Amortized Cost | 0 |  |
Unrealized Gain (Loss) | 0 |  |
Fair Value | 0 |  |
Credit Losses Realized in Earnings | 0 | 0 | 0
Preferred Term Securities XVI, Ltd [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Adjusted Amortized Cost | 0 |  |
Unrealized Gain (Loss) | 0 |  |
Fair Value | 0 |  |
Credit Losses Realized in Earnings | 0 | 0 | 118
US Capital Funding VI, Ltd. [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Adjusted Amortized Cost | 0 |  |
Unrealized Gain (Loss) | 0 |  |
Fair Value | 0 |  |
Credit Losses Realized in Earnings | $ 0 | $ 0 | $ 0

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