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Securities - Summary of Structured Pooled Trust Preferred Securities (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items] |  |  |
Adjusted Amortized Cost | $ 800 |  |
Unrealized Gain (Loss) | 1,249 |  |
Fair Value | 2,049 |  |
Credit Losses Realized in Earnings | 0 | $ 0 | $ 0
ALESCO Preferred Funding V, Ltd [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Adjusted Amortized Cost | 800 |  |
Unrealized Gain (Loss) | 330 |  |
Fair Value | 1,130 |  |
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) | 919 |  |
Fair Value | 919 |  |
Credit Losses Realized in Earnings | 0 | 0 | 0
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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