Interest Bearing Deposits (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Interest-bearing Deposit Liabilities [Abstract]
Interest bearing demand deposits	$ 4,016,209,000	$ 3,613,060,000
Money market accounts, excluding brokered deposits	6,136,538,000	6,542,448,000
Savings accounts	562,717,000	515,038,000
Time deposits, excluding brokered deposits	3,583,304,000	4,591,164,000
Brokered deposits	1,092,749,000	1,783,174,000
Total interest bearing deposits	15,391,517,000	17,044,884,000
Aggregate amount of time deposits of $100,000 or more	2,860,000,000	4,140,000,000
Time Deposits, by Maturity [Abstract]
Maturing within one year	3,327,915,000
Between 1 — 2 years	643,543,000
2 — 3 years	216,616,000
3 — 4 years	145,857,000
4 — 5 years	121,215,000
Thereafter	20,444,000
Time deposits	$ 4,475,590,000