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Carrying Amount and Fair Value of Company's Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Assets            
Available-for-sale securities $ 351,693   $ 519,820      
Held-to-maturity securities 30,903   579      
FDIC indemnification asset 29,745 30,908 34,691 37,102 40,389 48,149
Accrued interest receivable 6,346   7,521      
Derivative financial assets 7   84 19    
Liabilities            
Derivative financial liabilities 196   41 19    
Carrying (Reported) Amount, Fair Value Disclosure
           
Assets            
Cash and cash equivalents 105,922   56,567      
Available-for-sale securities 351,693   519,820      
Held-to-maturity securities 31,029   568      
Loans held for sale 1,150   883      
Loans held for investment less allowance 1,741,633   1,686,644      
FDIC indemnification asset 29,745   34,691      
Accrued interest receivable 6,346   7,521      
Derivative financial assets 7   84      
Deferred compensation assets 3,266   4,200      
Liabilities            
Securities sold under agreements to repurchase 114,439   118,308      
Accrued interest payable 1,889   2,169      
FHLB and other indebtedness 131,047   166,088      
Derivative financial liabilities 196   41      
Deferred compensation liabilities 3,266   4,200      
Carrying (Reported) Amount, Fair Value Disclosure | Demand Deposits
           
Liabilities            
Deposits Fair Value 397,523   339,680      
Carrying (Reported) Amount, Fair Value Disclosure | Interest-bearing Deposits
           
Liabilities            
Deposits Fair Value 347,589   361,821      
Carrying (Reported) Amount, Fair Value Disclosure | Savings Deposits
           
Liabilities            
Deposits Fair Value 519,902   524,010      
Carrying (Reported) Amount, Fair Value Disclosure | Bank Time Deposits
           
Liabilities            
Deposits Fair Value 667,261   725,231      
Estimate of Fair Value, Fair Value Disclosure
           
Assets            
Cash and cash equivalents 105,922   56,567      
Available-for-sale securities 351,693   519,820      
Held-to-maturity securities 30,903   579      
Loans held for sale 1,150   883      
Loans held for investment less allowance 1,778,672   1,655,430      
FDIC indemnification asset 19,459   34,691      
Accrued interest receivable 6,346   7,521      
Derivative financial assets 7   84      
Deferred compensation assets 3,266   4,200      
Liabilities            
Securities sold under agreements to repurchase 116,055   121,320      
Accrued interest payable 1,889   2,169      
FHLB and other indebtedness 140,270   178,031      
Derivative financial liabilities 196   41      
Deferred compensation liabilities 3,266   4,200      
Estimate of Fair Value, Fair Value Disclosure | Demand Deposits
           
Liabilities            
Deposits Fair Value 397,523   339,680      
Estimate of Fair Value, Fair Value Disclosure | Interest-bearing Deposits
           
Liabilities            
Deposits Fair Value 347,589   361,821      
Estimate of Fair Value, Fair Value Disclosure | Savings Deposits
           
Liabilities            
Deposits Fair Value 519,902   524,010      
Estimate of Fair Value, Fair Value Disclosure | Bank Time Deposits
           
Liabilities            
Deposits Fair Value 668,014   728,999      
Level 1
           
Assets            
Cash and cash equivalents 105,922   56,567      
Available-for-sale securities 224   251      
Deferred compensation assets 3,266   4,200      
Liabilities            
Deferred compensation liabilities 3,266   4,200      
Level 2
           
Assets            
Available-for-sale securities 351,469   519,569      
Held-to-maturity securities 30,903   579      
Loans held for sale 1,150   883      
Loans held for investment less allowance 7,849          
Accrued interest receivable 6,346   7,521      
Derivative financial assets 7   84      
Liabilities            
Securities sold under agreements to repurchase 116,055   121,320      
Accrued interest payable 1,889   2,169      
FHLB and other indebtedness 140,270   178,031      
Derivative financial liabilities 196   41      
Level 2 | Demand Deposits
           
Liabilities            
Deposits Fair Value 397,523   339,680      
Level 2 | Interest-bearing Deposits
           
Liabilities            
Deposits Fair Value 347,589   361,821      
Level 2 | Savings Deposits
           
Liabilities            
Deposits Fair Value 519,902   524,010      
Level 2 | Bank Time Deposits
           
Liabilities            
Deposits Fair Value 668,014   728,999      
Level 3
           
Assets            
Loans held for investment less allowance 1,770,823   1,655,430      
FDIC indemnification asset $ 19,459   $ 34,691