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Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 31, 2013 | Apr. 30, 2012 | Mar. 01, 2010 | Dec. 31, 2011 | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 06, 2011
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Rent expenses |  |  |  |  |  | $ 2,537 | $ 3,163 | $ 2,167 |
Sublease income netted against rent expense |  |  |  |  |  | 68 | 1,220 | 1,032 |
Discounted value for future payment |  |  |  |  | 1,978 |  |  |  |
Component of interest expense amortized |  |  |  |  |  | 272 |  |  |
Payment for contingent liability | 3,000 |  |  |  |  |  |  |  |
Guarantee liability |  |  |  | 1,084 |  | 1,084 | 1,084 |  |
Leawood Bancshares issued Trust Preferred Securities to Alesco X |  |  | 4,000 |  |  |  |  |  |
Leawood Bancshares repurchase Trust Preferred Securities from Alesco X |  |  | 1,000 |  |  |  |  |  |
Judgment in favor of Leawood and against Alesco, amount |  |  |  |  |  |  |  |  | 1,618
Judgment in favor of Crossfirst and against Alesco X, amount |  |  |  |  |  |  |  |  | 1,840
Contribution towards Alesco X |  |  |  | 2,250 |  |  |  |  |
Payment made against settlement to Alesco X |  | 2,250 |  |  |  |  |  |  |
Potential liability, assuming the restricted stock or restricted units to vest |  |  |  |  |  | 119 |  |  |
Alesco XIV Guarantee [Member] |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Guarantee liability |  |  |  |  |  | 1,084 |  |  |
Maximum potential loss on guarantee |  |  |  |  |  | $ 8,750 |  |  |

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