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Carrying Amount and Fair Value of Company's Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Assets    
Available-for-sale securities $ 534,358 $ 482,430
FDIC receivable under loss share agreements 48,073   
Accrued interest receivable 7,842 6,193
Carrying (Reported) Amount, Fair Value Disclosure
   
Assets    
Cash and cash equivalents 144,847 47,294
Available-for-sale securities 534,358  
Investment securities   485,920
Held-to-maturity securities 816  
Loans held for sale 6,672 5,820
Loans held for investment less allowance 1,698,883 1,369,862
FDIC receivable under loss share agreements 48,073  
Accrued interest receivable 7,842 6,193
Derivative financial assets 144 135
Deferred compensation assets 3,625 3,210
Liabilities    
Securities sold under agreements to repurchase 136,118 129,208
Accrued interest payable 2,481 2,554
FHLB and other indebtedness 177,435 165,933
Derivative financial liabilities 16 6
Deferred compensation liabilities 3,625 3,210
Carrying (Reported) Amount, Fair Value Disclosure | Demand Deposits
   
Liabilities    
Deposits Fair Value 343,352 240,268
Carrying (Reported) Amount, Fair Value Disclosure | Interest-bearing Deposits
   
Liabilities    
Deposits Fair Value 353,321 275,156
Carrying (Reported) Amount, Fair Value Disclosure | Savings Deposits
   
Liabilities    
Deposits Fair Value 500,276 394,707
Carrying (Reported) Amount, Fair Value Disclosure | Bank Time Deposits
   
Liabilities    
Deposits Fair Value 833,226 633,336
Estimate of Fair Value, Fair Value Disclosure
   
Assets    
Cash and cash equivalents 144,847 47,294
Available-for-sale securities 534,358  
Investment securities   485,962
Held-to-maturity securities 832  
Loans held for sale 6,774 5,877
Loans held for investment less allowance 1,702,128 1,386,419
FDIC receivable under loss share agreements 48,073  
Accrued interest receivable 7,842 6,193
Derivative financial assets 144 135
Deferred compensation assets 3,625 3,210
Liabilities    
Securities sold under agreements to repurchase 142,417 136,359
Accrued interest payable 2,481 2,554
FHLB and other indebtedness 200,418 183,722
Derivative financial liabilities 16 6
Deferred compensation liabilities 3,625 3,210
Estimate of Fair Value, Fair Value Disclosure | Demand Deposits
   
Liabilities    
Deposits Fair Value 343,352 240,268
Estimate of Fair Value, Fair Value Disclosure | Interest-bearing Deposits
   
Liabilities    
Deposits Fair Value 353,321 275,156
Estimate of Fair Value, Fair Value Disclosure | Savings Deposits
   
Liabilities    
Deposits Fair Value 500,276 394,707
Estimate of Fair Value, Fair Value Disclosure | Bank Time Deposits
   
Liabilities    
Deposits Fair Value 842,331 641,604
Level 1
   
Assets    
Cash and cash equivalents 144,847  
Deferred compensation assets 3,625  
Liabilities    
Deferred compensation liabilities 3,625  
Level 2
   
Assets    
Available-for-sale securities 534,358  
Held-to-maturity securities 832  
Loans held for sale 6,774  
Accrued interest receivable 7,842  
Derivative financial assets 144  
Liabilities    
Securities sold under agreements to repurchase 142,417  
Accrued interest payable 2,481  
FHLB and other indebtedness 200,418  
Derivative financial liabilities 16  
Level 2 | Demand Deposits
   
Liabilities    
Deposits Fair Value 343,352  
Level 2 | Interest-bearing Deposits
   
Liabilities    
Deposits Fair Value 353,321  
Level 2 | Savings Deposits
   
Liabilities    
Deposits Fair Value 500,276  
Level 2 | Bank Time Deposits
   
Liabilities    
Deposits Fair Value 842,331  
Level 3
   
Assets    
Loans held for investment less allowance 1,702,128  
FDIC receivable under loss share agreements $ 48,073