Quarterly report pursuant to Section 13 or 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
Mar. 31, 2013
Security
Dec. 31, 2012
Security
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss $ 1,272 $ 638
Available for Sale Within One Year, Estimated Fair Value 112,789 85,291
Available for Sale Within One Year, Number of Securities 42 33
Available for Sale More than One Year, Gross Unrealized Loss 240 301
Available for Sale More than One Year, Estimated Fair Value 12,212 13,655
Available for Sale More than One Year, Number of Securities 5 7
Available-for-sale Securities, Gross Unrealized Loss, Total 1,512 939
Available for Sale, Estimated Fair Value 125,001 98,946
Available for Sale, Number of Securities 47 40
Mortgage-Backed Securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss 503 186
Available for Sale Within One Year, Estimated Fair Value 35,523 28,354
Available for Sale Within One Year, Number of Securities 12 10
Available-for-sale Securities, Gross Unrealized Loss, Total 503 186
Available for Sale, Estimated Fair Value 35,523 28,354
Available for Sale, Number of Securities 12 10
Collateralized Mortgage Obligations [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss 185 109
Available for Sale Within One Year, Estimated Fair Value 18,076 14,344
Available for Sale Within One Year, Number of Securities 7 5
Available-for-sale Securities, Gross Unrealized Loss, Total 185 109
Available for Sale, Estimated Fair Value 18,076 14,344
Available for Sale, Number of Securities 7 5
U.S. Government Agency Securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss 177 94
Available for Sale Within One Year, Estimated Fair Value 35,799 26,894
Available for Sale Within One Year, Number of Securities 12 9
Available-for-sale Securities, Gross Unrealized Loss, Total 177 94
Available for Sale, Estimated Fair Value 35,799 26,894
Available for Sale, Number of Securities 12 9
Municipal Bonds-Taxable [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss 124 126
Available for Sale Within One Year, Estimated Fair Value 4,577 4,587
Available for Sale Within One Year, Number of Securities 4 4
Available for Sale More than One Year, Gross Unrealized Loss 3 9
Available for Sale More than One Year, Estimated Fair Value 464 1,964
Available for Sale More than One Year, Number of Securities 1 3
Available-for-sale Securities, Gross Unrealized Loss, Total 127 135
Available for Sale, Estimated Fair Value 5,041 6,551
Available for Sale, Number of Securities 5 7
Corporate Bonds [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss 116  
Available for Sale Within One Year, Estimated Fair Value 4,871  
Available for Sale Within One Year, Number of Securities 1  
Available for Sale More than One Year, Gross Unrealized Loss 185 246
Available for Sale More than One Year, Estimated Fair Value 10,801 10,738
Available for Sale More than One Year, Number of Securities 3 3
Available-for-sale Securities, Gross Unrealized Loss, Total 301 246
Available for Sale, Estimated Fair Value 15,672 10,738
Available for Sale, Number of Securities 4 3
SBA Loan Pool Securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss 166 82
Available for Sale Within One Year, Estimated Fair Value 13,918 11,004
Available for Sale Within One Year, Number of Securities 4 3
Available-for-sale Securities, Gross Unrealized Loss, Total 166 82
Available for Sale, Estimated Fair Value 13,918 11,004
Available for Sale, Number of Securities 4 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 25 12
Available for Sale Within One Year, Number of Securities 2 1
Available for Sale More than One Year, Gross Unrealized Loss 52 46
Available for Sale More than One Year, Estimated Fair Value 947 953
Available for Sale More than One Year, Number of Securities 1 1
Available-for-sale Securities, Gross Unrealized Loss, Total 53 47
Available for Sale, Estimated Fair Value 972 965
Available for Sale, Number of Securities 3 2
Equity Securities [Member]
   
Summary of Investment Holdings [Line Items]    
Available for Sale Within One Year, Gross Unrealized Loss   40
Available for Sale Within One Year, Estimated Fair Value   96
Available for Sale Within One Year, Number of Securities   1
Available-for-sale Securities, Gross Unrealized Loss, Total   40
Available for Sale, Estimated Fair Value   $ 96
Available for Sale, Number of Securities   1