Deposits (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Weighted Average Rate:
Savings (as a percent)	0.05%	0.05%
Money market (as a percent)	0.25%	0.74%
NOW (as a percent)	0.06%	0.05%
Total core deposits (as a percent)	0.11%	0.21%
Certificates of deposit (as a percent)	1.50%	1.55%
Total deposits (as a percent)	0.57%	0.72%
Balance:
Savings	$ 2,493,899	$ 2,802,298
Money market	1,972,136	1,586,556
NOW	1,231,890	1,259,771
Non-interest bearing NOW and demand deposit	865,588	834,962
Total core deposits	6,563,513	6,483,587
Certificates of deposit	3,291,797	3,960,371
Total deposits	$ 9,855,310	$ 10,443,958
Percent of Total:
Savings (as a percent)	25.31%	26.83%
Money market (as a percent)	20.01%	15.19%
NOW (as a percent)	12.50%	12.06%
Non-interest bearing NOW and demand deposit (as a percent)	8.78%	8.00%
Total core deposits (as a percent)	66.60%	62.08%
Certificates of deposit (as a percent)	33.40%	37.92%
Total deposits (as a percent)	100.00%	100.00%