Deposits (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Jan. 17, 2014 Subsequent Event [Member]
Schedule of Deposits [Line Items]
Interest bearing demand deposits	$ 3,969,634,000	$ 4,016,209,000
Money market accounts, excluding brokered deposits	6,069,548,000	6,136,538,000
Savings accounts	602,655,000	562,717,000
Time deposits, excluding brokered deposits	3,498,200,000	3,583,304,000
Brokered deposits	1,094,002,000	1,092,749,000
Total interest bearing deposits	15,234,039,000	15,391,517,000
Aggregate amount of time deposits of $100,000 or more	2,910,000,000	2,860,000,000
Time Deposits, by Maturity [Abstract]
Maturing within one year	3,234,724,000
Between 1 — 2 years	625,630,000
2 — 3 years	254,344,000
3 — 4 years	155,221,000
4 — 5 years	89,319,000
Thereafter	19,807,000
Time deposits	4,379,045,000
Deposits sold			$ 191,400,000