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Securities - (Details 6) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cumulative credit related losses recognized in earnings    
Beginning balance $ (3,337) $ (3,337)
Additions related to credit losses for which OTTI was not previously recognized 0 0
Increases in credit loss for which OTTI was previously recognized 0 0
Ending balance $ (3,337) $ (3,337)