Quarterly report pursuant to Section 13 or 15(d)

Investment Securities - Schedule of Investment Securities (Detail)

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Investment Securities - Schedule of Investment Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Summary of Investment Holdings [Line Items]    
Available for Sale Within one year, Amortized cost     
Available for Sale Over one year through five years, Amortized Cost 29,404  
Available for Sale Over five years through ten years, Amortized Cost 111,880  
Available for Sale Over ten years, Amortized Cost 49,130  
Available for Sale, Amortized Cost 399,900 443,712
Available for Sale Within one year, Estimated Fair Value     
Available for Sale Over one year through five years, Estimated Fair Value 29,406  
Available for Sale Over five years through ten years, Estimated Fair Value 111,811  
Available for Sale Over ten years, Estimated Fair Value 49,393  
Available for Sale, Estimated Fair Value 400,815 451,060
Mortgage-backed securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale, Amortized Cost 125,177 157,185
Available for Sale, Estimated Fair Value 124,618 160,326
Collateralized mortgage obligations [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale, Amortized Cost 83,955 98,821
Available for Sale, Estimated Fair Value 84,848 100,487
Equity securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale, Amortized Cost 354 354
Available for Sale, Estimated Fair Value $ 739 $ 392