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Securities (Other-than-temporary impairments) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2012
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
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 $ 981 0 0 0 0 $ 769
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 (120) 0  
Accretion of non-credit related impairment   0 (24) (7) (48)  
Total changes to AOCI for non-credit related impairment   0 (24) (127) (48)  
Total OTTI losses (accretion) recorded on debt securities, net   $ 0 $ (24) $ (127) $ (48)