Annual report pursuant to Section 13 and 15(d)

Investment Securities - Continuous Unrealized Loss Position (Detail)

v2.4.0.6
Investment Securities - Continuous Unrealized Loss Position (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Security
Dec. 31, 2011
Security
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss $ 638 $ 359
Available for Sale Within One Year, Estimated Fair Value 85,291 50,430
Available for Sale Within One Year, Number of Securities 33 23
Available for Sale More than One Year, Gross Unrealized Loss 301 623
Available for Sale More than One Year, Estimated Fair Value 13,655 16,350
Available for Sale More than One Year, Number of Securities 7 5
Available-for-sale Securities, Gross Unrealized Loss, Total 939 982
Available for Sale, Estimated Fair Value 98,946 66,780
Available for Sale, Number of Securities 40 28
Mortgage-Backed Securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss 186 1
Available for Sale Within One Year, Estimated Fair Value 28,354 3,076
Available for Sale Within One Year, Number of Securities 10 1
Available for Sale More than One Year, Gross Unrealized Loss      
Available for Sale More than One Year, Estimated Fair Value      
Available for Sale More than One Year, Number of Securities      
Available-for-sale Securities, Gross Unrealized Loss, Total 186 1
Available for Sale, Estimated Fair Value 28,354 3,076
Available for Sale, Number of Securities 10 1
Collateralized Mortgage Obligations [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss 109 260
Available for Sale Within One Year, Estimated Fair Value 14,344 36,751
Available for Sale Within One Year, Number of Securities 5 16
Available for Sale More than One Year, Gross Unrealized Loss      
Available for Sale More than One Year, Estimated Fair Value      
Available for Sale More than One Year, Number of Securities      
Available-for-sale Securities, Gross Unrealized Loss, Total 109 260
Available for Sale, Estimated Fair Value 14,344 36,751
Available for Sale, Number of Securities 5 16
U.S. Government Agency Securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss 94 5
Available for Sale Within One Year, Estimated Fair Value 26,894 6,061
Available for Sale Within One Year, Number of Securities 9 2
Available for Sale More than One Year, Gross Unrealized Loss      
Available for Sale More than One Year, Estimated Fair Value      
Available for Sale More than One Year, Number of Securities      
Available-for-sale Securities, Gross Unrealized Loss, Total 94 5
Available for Sale, Estimated Fair Value 26,894 6,061
Available for Sale, Number of Securities 9 2
Municipal Bonds-Taxable [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss 126  
Available for Sale Within One Year, Estimated Fair Value 4,587  
Available for Sale Within One Year, Number of Securities 4  
Available for Sale More than One Year, Gross Unrealized Loss 9  
Available for Sale More than One Year, Estimated Fair Value 1,964  
Available for Sale More than One Year, Number of Securities 3  
Available-for-sale Securities, Gross Unrealized Loss, Total 135   
Available for Sale, Estimated Fair Value 6,551  
Available for Sale, Number of Securities 7  
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 246 582
Available for Sale More than One Year, Estimated Fair Value 10,738 15,391
Available for Sale More than One Year, Number of Securities 3 4
Available-for-sale Securities, Gross Unrealized Loss, Total 246 623
Available for Sale, Estimated Fair Value 10,738 19,836
Available for Sale, Number of Securities 3 6
SBA Loans Pools Securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss 82  
Available for Sale Within One Year, Estimated Fair Value 11,004  
Available for Sale Within One Year, Number of Securities 3  
Available for Sale More than One Year, Gross Unrealized Loss     
Available for Sale More than One Year, Estimated Fair Value     
Available for Sale More than One Year, Number of Securities     
Available-for-sale Securities, Gross Unrealized Loss, Total 82  
Available for Sale, Estimated Fair Value 11,004  
Available for Sale, Number of Securities 3  
Other 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 12 12
Available for Sale Within One Year, Number of Securities 1 1
Available for Sale More than One Year, Gross Unrealized Loss 46 41
Available for Sale More than One Year, Estimated Fair Value 953 959
Available for Sale More than One Year, Number of Securities 1 1
Available-for-sale Securities, Gross Unrealized Loss, Total 47 41
Available for Sale, Estimated Fair Value 965 971
Available for Sale, Number of Securities 2 2
Equity Securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss 40 51
Available for Sale Within One Year, Estimated Fair Value 96 85
Available for Sale Within One Year, Number of Securities 1 1
Available for Sale More than One Year, Gross Unrealized Loss      
Available for Sale More than One Year, Estimated Fair Value      
Available for Sale More than One Year, Number of Securities     
Available-for-sale Securities, Gross Unrealized Loss, Total 40 51
Available for Sale, Estimated Fair Value $ 96 $ 85
Available for Sale, Number of Securities 1 1