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Securities Restricted Equity Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Restricted Equity Securities [Abstract]      
Federal Reserve stock $ 41,178 $ 40,746 $ 36,676
Federal Home Loan Bank stock 306,543 279,200 274,113
Other 0 243 244
Total $ 347,721 $ 320,189 $ 311,033