Annual report pursuant to Section 13 and 15(d)

Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Detail)

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Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within one year, Amortized Cost $ 19,998  
Available-for-Sale Over one year through five years, Amortized Cost 31,560  
Available-for-Sale Over five years through ten years, Amortized Cost 101,992  
Available-for-Sale Over ten years, Amortized Cost 42,159  
Available-for-Sale, Amortized Cost 549,113 443,712
Available-for-Sale Within one year, Estimated Fair Value 19,996  
Available-for-Sale Over one year through five years, Estimated Fair Value 31,306  
Available-for-Sale Over five years through ten years, Estimated Fair Value 95,869  
Available-for-Sale Over ten years, Estimated Fair Value 39,003  
Available-for-Sale, Estimated Fair Value 530,926 451,060
Collateralized mortgage obligations [Member]
   
Summary of Investment Holdings [Line Items]    
Available-for-Sale, Amortized Cost 130,636 98,821
Available-for-Sale, Estimated Fair Value 127,693 100,487
Mortgage-backed securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available-for-Sale, Amortized Cost 222,768 157,185
Available-for-Sale, Estimated Fair Value $ 217,059 $ 160,326