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Note G - Accumulated Other Comprehensive Income (Details) - Reclassification Out of Accumulated Other Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Unrealized gains and losses on available-for-sale securities:        
Total before tax $ 8,412 $ 3,968 $ 18,772 $ 7,600
Tax benefit 3,355 1,575 7,413 2,981
Total after tax 5,057 2,393 11,359 4,619
Reclassification out of Accumulated Other Comprehensive Income [Member]
        
Unrealized gains and losses on available-for-sale securities:        
Impairment expense     (1) [1]  
Total before tax     (1) [1]  
Tax benefit        [1]  
Total after tax     $ (1) [1]  
[1] Amounts in parentheses indicate debits to profit/loss