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Investment Securities (Other-than-temporarily Impaired Securities) (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Other Than Temporary Impairment Credit Losses Recognized In Earnings Roll Forward    
Begging Balance $ 1,490,000 $ 0
Reductions for securities sold during the period (ealized) $ (1,490,000) $ 0