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
Sep. 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 33,325  
Available-for-Sale Over five years through ten years, Amortized Cost 105,186  
Available-for-Sale Over ten years, Amortized Cost 39,390  
Available-for-Sale, Amortized Cost 392,773 443,712
Available-for-Sale Within one year, Estimated Fair Value     
Available-for-Sale Over one year through five years, Estimated Fair Value 33,315  
Available-for-Sale Over five years through ten years, Estimated Fair Value 100,320  
Available-for-Sale Over ten years, Estimated Fair Value 36,842  
Available-for-Sale, Estimated Fair Value 383,057 451,060
Mortgage-backed securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available-for-Sale, Amortized Cost 129,463 157,185
Available-for-Sale, Estimated Fair Value 127,085 160,326
Collateralized mortgage obligations [Member]
   
Summary of Investment Holdings [Line Items]    
Available-for-Sale, Amortized Cost 85,191 98,821
Available-for-Sale, Estimated Fair Value 85,110 100,487
Equity securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available-for-Sale, Amortized Cost 218 354
Available-for-Sale, Estimated Fair Value $ 385 $ 392