Interest Bearing Deposits (Remaining Maturities Of Time Deposits of $100,000 Or More) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Banking and Thrift [Abstract]
Three months or less	$ 313,389
Over three months through six months	171,345
Over six months through twelve months	394,876
Over twelve months	804,888
Time, $100,000 and over	$ 1,684,498	$ 1,702,982