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Carrying Amount and Fair Value of Company's Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Assets            
Available-for-sale securities $ 376,191   $ 326,117      
Held-to-maturity securities 72,879   57,889      
FDIC indemnification asset 23,653 $ 26,053 27,900 $ 30,908 $ 32,510 $ 34,691
Accrued interest receivable 6,119   6,315      
Derivative financial assets 20   5 31    
Liabilities            
Derivative financial liabilities 192   214 $ 231    
Carrying (Reported) Amount, Fair Value Disclosure            
Assets            
Cash and cash equivalents 92,602   237,660      
Available-for-sale securities 376,191   326,117      
Held-to-maturity securities 72,652   57,948      
Loans held for sale 913   1,792      
Loans held for investment less allowance 1,647,031   1,669,189      
FDIC indemnification asset 23,653   27,900      
Accrued interest receivable 6,119   6,315      
Derivative financial assets 20   5      
Deferred compensation assets 3,539   3,380      
Liabilities            
Securities sold under agreements to repurchase 122,158   121,742      
Accrued interest payable 1,431   1,668      
FHLB and other borrowings 80,999   107,999      
Derivative financial liabilities 192   214      
Deferred compensation liabilities 3,539   3,380      
Carrying (Reported) Amount, Fair Value Disclosure | Demand Deposits            
Liabilities            
Deposits Fair Value 424,438   417,729      
Carrying (Reported) Amount, Fair Value Disclosure | Interest-bearing Deposits            
Liabilities            
Deposits Fair Value 329,583   353,874      
Carrying (Reported) Amount, Fair Value Disclosure | Savings Deposits            
Liabilities            
Deposits Fair Value 528,003   525,478      
Carrying (Reported) Amount, Fair Value Disclosure | Bank Time Deposits            
Liabilities            
Deposits Fair Value 638,197   703,678      
Estimate of Fair Value, Fair Value Disclosure            
Assets            
Cash and cash equivalents 92,602   237,660      
Available-for-sale securities 376,191   326,117      
Held-to-maturity securities 72,879   57,889      
Loans held for sale 930   1,790      
Loans held for investment less allowance 1,684,342   1,738,553      
FDIC indemnification asset 13,597   18,040      
Accrued interest receivable 6,119   6,315      
Derivative financial assets 20   5      
Deferred compensation assets 3,539   3,380      
Liabilities            
Securities sold under agreements to repurchase 123,073   123,114      
Accrued interest payable 1,431   1,668      
FHLB and other borrowings 87,371   116,599      
Derivative financial liabilities 192   214      
Deferred compensation liabilities 3,539   3,380      
Estimate of Fair Value, Fair Value Disclosure | Demand Deposits            
Liabilities            
Deposits Fair Value 424,438   417,729      
Estimate of Fair Value, Fair Value Disclosure | Interest-bearing Deposits            
Liabilities            
Deposits Fair Value 329,583   353,874      
Estimate of Fair Value, Fair Value Disclosure | Savings Deposits            
Liabilities            
Deposits Fair Value 528,003   525,478      
Estimate of Fair Value, Fair Value Disclosure | Bank Time Deposits            
Liabilities            
Deposits Fair Value 637,691   704,590      
Level 1            
Assets            
Cash and cash equivalents 92,602   237,660      
Available-for-sale securities 201   221      
Deferred compensation assets 3,539   3,380      
Liabilities            
Deferred compensation liabilities 3,539   3,380      
Level 2            
Assets            
Available-for-sale securities 375,990   325,896      
Held-to-maturity securities 72,879   57,889      
Loans held for sale 930   1,790      
Loans held for investment less allowance 5,271   3,406      
Accrued interest receivable 6,119   6,315      
Derivative financial assets 20   5      
Liabilities            
Securities sold under agreements to repurchase 123,073   123,114      
Accrued interest payable 1,431   1,668      
FHLB and other borrowings 87,371   116,599      
Derivative financial liabilities 192   214      
Level 2 | Demand Deposits            
Liabilities            
Deposits Fair Value 424,438   417,729      
Level 2 | Interest-bearing Deposits            
Liabilities            
Deposits Fair Value 329,583   353,874      
Level 2 | Savings Deposits            
Liabilities            
Deposits Fair Value 528,003   525,478      
Level 2 | Bank Time Deposits            
Liabilities            
Deposits Fair Value 637,691   704,590      
Level 3            
Assets            
Loans held for investment less allowance 1,679,071   1,735,147      
FDIC indemnification asset $ 13,597   $ 18,040