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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