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Securities (Securities, With Unrealized Losses Segregated By Length Of Impairment) (Detail) (States And Political Subdivisions [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
States And Political Subdivisions [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Available for Sale, Less than 12 months, Estimated Fair Value $ 16,761
Available for Sale, Less than 12 Months, Unrealized Losses 12
Available for Sale, More than 12 Months, Estimated Fair Value   
Available for Sale, More than 12 Months, Unrealized Losses   
Available for Sale, Total, Estimated Fair Value 16,761
Available for Sale, Total, Unrealized Losses $ 12