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Investment Securities (Details 3) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Initial impairments
Dec. 31, 2013
Subsequent impairments
Dec. 31, 2012
Subsequent impairments
Dec. 31, 2010
Subsequent impairments
Schedule of other-than-temporary impairment losses investment securities              
Life-to-Date Gross Other-Than-Temporary Impairments, Beginning Balance $ 2,565 $ 2,435 $ 2,317        
Life-to-Date Gross Other-Than-Temporary Impairments, Subsequent impairments 38 130 118 7 38 130 111
Life-to-Date Gross Other-Than-Temporary Impairments, Ending Balance 2,603 2,565 2,435        
Life-to-Date Other-Than-Temporary Impairments Included in Other Comprehensive Income, Beginning Balance 1,152 1,100 1,080        
Life-to-Date Other-Than-Temporary Impairments Included in Other Comprehensive Income, Subsequent impairments       0 0 52 20
Life-to-Date Other-Than-Temporary Impairments Included in Other Comprehensive Income, Ending Balance 1,152 1,152 1,100        
Life-to-Date Net Other-Than-Temporary Impairments Included in Earnings, Beginning Balance 1,413 1,335 1,237        
Impairment loss on investment of securities 38 78 98 7 38 78 91
Life-to-Date Net Other-Than-Temporary Impairments Included in Earnings, Ending Balance $ 1,451 $ 1,413 $ 1,335