Quarterly report pursuant to Section 13 or 15(d)

Investment Securities (Detail)

v2.4.0.6
Investment Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 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 33,266  
Available for Sale Over Five Years Through Ten Years, Amortized Cost 94,078  
Available for Sale Over Ten Years, Amortized Cost 36,982  
Amortized Cost 402,978 377,747
Available for Sale Within One Year, Estimated Fair Value     
Available for Sale Over One Year Through Five Years, Estimated Fair Value 32,891  
Available for Sale Over Five Years Through Ten Years, Estimated Fair Value 95,429  
Available for Sale Over Ten Years, Estimated Fair Value 38,041  
Estimated Fair Value 410,210 381,862
Mortgage-Backed Securities [Member]
   
Summary of Investment Holdings [Line Items]    
Amortized Cost 138,173 [1] 110,433 [1]
Estimated Fair Value 142,168 [1] 113,005 [1]
Collateralized Mortgage Obligations [Member]
   
Summary of Investment Holdings [Line Items]    
Amortized Cost 100,125 [1] 161,214 [1]
Estimated Fair Value 101,390 [1] 162,837 [1]
Total Equity Securities Available For Sale [Member]
   
Summary of Investment Holdings [Line Items]    
Amortized Cost 354 647
Estimated Fair Value $ 291 $ 681
[1] Collateralized by residential mortgages and guaranteed by U.S. government sponsored entities