Deposits (Schedule of Maturities of Time Certificates of Deposit) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deposits [Abstract]
Due within one year	$ 3,213,010	$ 3,167,220
Due in one to two years	1,251,446	969,130
Due in two to three years	710,836	127,548
Due in three to four years	47,979	98,952
Due in four to five years	37,563	44,206
Due after five years	7	314
Total time certificate of deposits	$ 5,260,841	$ 4,407,370