XML 44 R50.htm IDEA: XBRL DOCUMENT v2.4.0.6
Securities (Year End Securities with Unrealized Losses Segregated by Length of Impairment) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of Available-for-Sale Securities [Line Items]    
Available for Sale, Less than 12 Months, Estimated Fair Value   $ 103,258
Available for Sale, Less than 12 Months, Unrealized Losses   180
Available for Sale, More than 12 Months, Estimated Fair Value   1,164
Available for Sale, More than 12 Months, Unrealized Losses   23
Available for Sale, Total Estimated Fair Value   104,422
Available for Sale, Total Unrealized Losses   203
Residential Mortgage Backed Securities [Member]
   
Schedule of Available-for-Sale Securities [Line Items]    
Available for Sale, Less than 12 Months, Estimated Fair Value 3,007 103,258
Available for Sale, Less than 12 Months, Unrealized Losses 24 180
Available for Sale, More than 12 Months, Estimated Fair Value 59  
Available for Sale, More than 12 Months, Unrealized Losses 1  
Available for Sale, Total Estimated Fair Value 3,066 103,258
Available for Sale, Total Unrealized Losses 25 180
States and Political Subdivisions [Member]
   
Schedule of Available-for-Sale Securities [Line Items]    
Held to Maturity, Less than 12 Months, Estimated Fair Value 353,626  
Held to Maturity, Less than 12 Months, Unrealized Losses 4,993  
Held to Maturity, More than 12 Months, Estimated Fair Value     
Held to Maturity, More than 12 Months, Unrealized Losses     
Held to Maturity, Total Estimated Fair Value 353,626  
Held to Maturity, Total Unrealized Losses 4,993  
Available for Sale, More than 12 Months, Estimated Fair Value   1,164
Available for Sale, More than 12 Months, Unrealized Losses   23
Available for Sale, Total Estimated Fair Value   1,164
Available for Sale, Total Unrealized Losses   $ 23