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Securities (Other-than-temporary impairments) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Recorded as part of gross realized losses:        
Credit related OTTI $ 0 $ 0 $ 0 $ 0
Intent to sell OTTI 0 0 0 0
Total recorded as part of gross realized losses 0 0 0 0
Recorded directly to AOCI for non-credit related impairment:        
Residential mortgage backed securities 0 0 0 0
Reduction of non-credit related impairment related to security sales 0 0 0 (120)
Accretion of non-credit related impairment 0 0 0 (7)
Total changes to AOCI for non-credit related impairment 0 0 0 (127)
Total OTTI losses (accretion) recorded on debt securities, net $ 0 $ 0 $ 0 $ (127)