Quarterly report pursuant to Section 13 or 15(d)

Continuous Unrealized Loss Position (Detail)

v2.4.0.6
Continuous Unrealized Loss Position (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Security
Dec. 31, 2011
Security
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss $ 251 $ 359
Available for Sale Within One Year, Estimated Fair Value 37,943 50,430
Available for Sale Within One Year, Number of Securities 14 23
Available for Sale More than One Year, Gross Unrealized Loss 686 623
Available for Sale More than One Year, Estimated Fair Value 13,277 16,350
Available for Sale More than One Year, Number of Securities 7 5
Available-for-sale Securities, Gross Unrealized Loss, Total 937 982
Available for Sale, Estimated Fair Value 51,220 66,780
Available for Sale, Number of Securities 21 28
Mortgage-Backed Securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss 1 1
Available for Sale Within One Year, Estimated Fair Value 5,988 3,076
Available for Sale Within One Year, Number of Securities 1 1
Available-for-sale Securities, Gross Unrealized Loss, Total 1 [1] 1 [1]
Available for Sale, Estimated Fair Value 5,988 3,076
Available for Sale, Number of Securities 1 1
Collateralized Mortgage Obligations [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss 31 260
Available for Sale Within One Year, Estimated Fair Value 9,890 36,751
Available for Sale Within One Year, Number of Securities 4 16
Available-for-sale Securities, Gross Unrealized Loss, Total 31 260
Available for Sale, Estimated Fair Value 9,890 36,751
Available for Sale, Number of Securities 4 16
U.S. Government Agencies Securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss 48 5
Available for Sale Within One Year, Estimated Fair Value 19,448 6,061
Available for Sale Within One Year, Number of Securities 6 2
Available-for-sale Securities, Gross Unrealized Loss, Total 48 5
Available for Sale, Estimated Fair Value 19,448 6,061
Available for Sale, Number of Securities 6 2
Municipal Bonds - Taxable [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss 108  
Available for Sale Within One Year, Estimated Fair Value 2,544  
Available for Sale Within One Year, Number of Securities 2  
Available for Sale More than One Year, Gross Unrealized Loss 19  
Available for Sale More than One Year, Estimated Fair Value 1,962  
Available for Sale More than One Year, Number of Securities 3  
Available-for-sale Securities, Gross Unrealized Loss, Total 127  
Available for Sale, Estimated Fair Value 4,506  
Available for Sale, Number of Securities 5  
Corporate Bonds [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss   41
Available for Sale Within One Year, Estimated Fair Value   4,445
Available for Sale Within One Year, Number of Securities   2
Available for Sale More than One Year, Gross Unrealized Loss 632 583
Available for Sale More than One Year, Estimated Fair Value 10,350 15,391
Available for Sale More than One Year, Number of Securities 3 4
Available-for-sale Securities, Gross Unrealized Loss, Total 632 624
Available for Sale, Estimated Fair Value 10,350 19,836
Available for Sale, Number of Securities 3 6
Other Securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss   1
Available for Sale Within One Year, Estimated Fair Value   12
Available for Sale Within One Year, Number of Securities   1
Available for Sale More than One Year, Gross Unrealized Loss 35 40
Available for Sale More than One Year, Estimated Fair Value 965 959
Available for Sale More than One Year, Number of Securities 1 1
Available-for-sale Securities, Gross Unrealized Loss, Total 35 41
Available for Sale, Estimated Fair Value 965 971
Available for Sale, Number of Securities 1 2
Total Equity Securities Available For Sale [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss 63 51
Available for Sale Within One Year, Estimated Fair Value 73 85
Available for Sale Within One Year, Number of Securities 1 1
Available-for-sale Securities, Gross Unrealized Loss, Total 63 51
Available for Sale, Estimated Fair Value $ 73 $ 85
Available for Sale, Number of Securities 1 1
[1] Collateralized by residential mortgages and guaranteed by U.S. government sponsored entities