Deposits (Schedule of Maturities of Time Certificates of Deposit) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deposits [Abstract]
Due within one year	$ 3,314,646	$ 3,239,761
Due in one to two years	1,042,769	1,004,024
Due in two to three years	377,180	235,585
Due in three to four years	135,003	290,741
Due in four to five years	105,944	108,511
Due after five years	5,369	4,278
Total time certificates of deposit	$ 4,980,911	$ 4,882,900