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Securities Restricted Equity Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Restricted Equity Securities [Abstract]      
Federal Reserve stock $ 36,283 $ 36,148 $ 35,148
Federal Home Loan Bank stock 283,155 237,365 196,201
Other 201 171 171
Total $ 319,639 $ 273,684 $ 231,520