Loans Receivable and Allowance for Loan Losses (Details 5) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Recorded Investment
Total loans	$ 12,483,497	$ 13,155,914
Residential Mortgage Loans | Interest-only loans
Recorded Investment
Within one year	229,445
More than one year to three years	1,334,544
More than three years to five years	769,974
Over five years	71,420
Total loans	$ 2,405,383