Annual report pursuant to Section 13 and 15(d)

Investment Securities - Schedule of Investment Securities (Detail)

v2.4.0.6
Investment Securities - Schedule of Investment Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
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 28,257  
Available for Sale Over Five Years Through Ten Years, Amortized Cost 105,386  
Available for Sale Over Ten Years, Amortized Cost 39,605  
Available for Sale, Amortized Cost 443,712 377,747
Available for Sale Within One Year, Estimated Fair Value     
Available for Sale Over One Year Through Five Years, Estimated Fair Value 28,342  
Available for Sale Over Five Years Through Ten Years, Estimated Fair Value 106,787  
Available for Sale Over Ten Years, Estimated Fair Value 40,700  
Available for Sale, Estimated Fair Value 451,060 381,862
Mortgage-Backed Securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale, Amortized Cost 157,185 110,433
Available for Sale, Estimated Fair Value 160,326 113,005
Collateralized Mortgage Obligations [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale, Amortized Cost 98,821 161,214
Available for Sale, Estimated Fair Value 100,487 162,837
SBA Loans Pools Securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale, Amortized Cost 14,104  
Available for Sale, Estimated Fair Value 14,026  
Equity Securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale, Amortized Cost 354 647
Available for Sale, Estimated Fair Value $ 392 $ 681