Deposits (Schedule of Maturities of Time Certificates of Deposit) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deposits [Abstract]
Due within one year	$ 2,851,153	$ 2,722,029
Due in one to two years	846,107	1,009,936
Due in two to three years	148,199	247,418
Due in three to four years	85,169	86,884
Due in four to five years	73,440	69,360
Due after five years	609	4,183
Total time certificates of deposit	$ 4,004,677	$ 4,139,810