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
Mar. 31, 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 28,245  
Available for Sale Over Five Years Through Ten Years, Amortized Cost 101,508  
Available for Sale Over Ten Years, Amortized Cost 45,164  
Available for Sale, Amortized Cost 413,132 443,712
Available for Sale Within One Year, Estimated Fair Value     
Available for Sale Over One Year Through Five Years, Estimated Fair Value 28,281  
Available for Sale Over Five Years Through Ten Years, Estimated Fair Value 102,738  
Available for Sale Over Ten Years, Estimated Fair Value 46,098  
Available for Sale, Estimated Fair Value 419,903 451,060
Mortgage-Backed Securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale, Amortized Cost 146,889 157,185
Available for Sale, Estimated Fair Value 149,394 160,326
Collateralized Mortgage Obligations [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale, Amortized Cost 90,972 98,821
Available for Sale, Estimated Fair Value 92,868 100,487
Equity Securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale, Amortized Cost 354 354
Available for Sale, Estimated Fair Value $ 524 $ 392