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Carrying Amount and Fair Value of Company's Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Assets            
Available-for-sale securities $ 398,425   $ 519,820      
Held-to-maturity securities 19,403   579      
FDIC indemnification asset 30,908 32,510 34,691 40,389 43,921 48,149
Accrued interest receivable 6,206   7,521      
Derivative financial assets 31   84 17    
Liabilities            
Derivative financial liabilities 231   41 163    
Carrying (Reported) Amount, Fair Value Disclosure
           
Assets            
Cash and cash equivalents 96,781   56,567      
Available-for-sale securities 398,425   519,820      
Held-to-maturity securities 19,398   568      
Loans held for sale 459   883      
Loans held for investment less allowance 1,735,513   1,686,644      
FDIC indemnification asset 30,908   34,691      
Accrued interest receivable 6,206   7,521      
Derivative financial assets 31   84      
Deferred compensation assets 3,317   4,200      
Liabilities            
Securities sold under agreements to repurchase 120,159   118,308      
Accrued interest payable 2,121   2,169      
FHLB and other indebtedness 166,087   166,088      
Derivative financial liabilities 231   41      
Deferred compensation liabilities 3,317   4,200      
Carrying (Reported) Amount, Fair Value Disclosure | Demand Deposits
           
Liabilities            
Deposits Fair Value 357,871   339,680      
Carrying (Reported) Amount, Fair Value Disclosure | Interest-bearing Deposits
           
Liabilities            
Deposits Fair Value 362,318   361,821      
Carrying (Reported) Amount, Fair Value Disclosure | Savings Deposits
           
Liabilities            
Deposits Fair Value 517,766   524,010      
Carrying (Reported) Amount, Fair Value Disclosure | Bank Time Deposits
           
Liabilities            
Deposits Fair Value 685,149   725,231      
Estimate of Fair Value, Fair Value Disclosure
           
Assets            
Cash and cash equivalents 96,781   56,567      
Available-for-sale securities 398,425   519,820      
Held-to-maturity securities 19,403   579      
Loans held for sale 459   883      
Loans held for investment less allowance 1,737,069   1,655,430      
FDIC indemnification asset 20,654   34,691      
Accrued interest receivable 6,206   7,521      
Derivative financial assets 31   84      
Deferred compensation assets 3,317   4,200      
Liabilities            
Securities sold under agreements to repurchase 122,639   121,320      
Accrued interest payable 2,121   2,169      
FHLB and other indebtedness 177,247   178,031      
Derivative financial liabilities 231   41      
Deferred compensation liabilities 3,317   4,200      
Estimate of Fair Value, Fair Value Disclosure | Demand Deposits
           
Liabilities            
Deposits Fair Value 357,871   339,680      
Estimate of Fair Value, Fair Value Disclosure | Interest-bearing Deposits
           
Liabilities            
Deposits Fair Value 362,318   361,821      
Estimate of Fair Value, Fair Value Disclosure | Savings Deposits
           
Liabilities            
Deposits Fair Value 517,766   524,010      
Estimate of Fair Value, Fair Value Disclosure | Bank Time Deposits
           
Liabilities            
Deposits Fair Value 687,957   728,999      
Level 1
           
Assets            
Cash and cash equivalents 96,781   56,567      
Available-for-sale securities 1,034   251      
Deferred compensation assets 3,317   4,200      
Liabilities            
Deferred compensation liabilities 3,317   4,200      
Level 2
           
Assets            
Available-for-sale securities 397,391   519,569      
Held-to-maturity securities 19,403   579      
Loans held for sale 459   883      
Loans held for investment less allowance 7,928          
Accrued interest receivable 6,206   7,521      
Derivative financial assets 31   84      
Liabilities            
Securities sold under agreements to repurchase 122,639   121,320      
Accrued interest payable 2,121   2,169      
FHLB and other indebtedness 177,247   178,031      
Derivative financial liabilities 231   41      
Level 2 | Demand Deposits
           
Liabilities            
Deposits Fair Value 357,871   339,680      
Level 2 | Interest-bearing Deposits
           
Liabilities            
Deposits Fair Value 362,318   361,821      
Level 2 | Savings Deposits
           
Liabilities            
Deposits Fair Value 517,766   524,010      
Level 2 | Bank Time Deposits
           
Liabilities            
Deposits Fair Value 687,957   728,999      
Level 3
           
Assets            
Loans held for investment less allowance 1,729,141   1,655,430      
FDIC indemnification asset $ 20,654   $ 34,691