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Securities Restricted Equity Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Restricted Equity Securities [Abstract]      
Federal Reserve stock $ 36,498 $ 36,498 $ 36,148
Federal Home Loan Bank stock 247,194 270,541 278,271
Other 244 201 171
Total $ 283,936 $ 307,240 $ 314,590