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Securities Restricted Equity Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Restricted Equity Securities [Abstract]      
Federal Reserve stock $ 36,148 $ 36,148 $ 35,018
Federal Home Loan Bank stock 278,271 237,365 177,667
Other 171 171 0
Total $ 314,590 $ 273,684 $ 212,685