Fair Value Measurements (Details 6) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Aggregate Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans held for sale measured at fair value	$ 39,131
Past due loans of 90 days or more
Nonaccrual loans
Aggregate Unpaid Principal Balance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans held for sale measured at fair value	37,604
Past due loans of 90 days or more
Nonaccrual loans
Difference [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans held for sale measured at fair value	1,527
Past due loans of 90 days or more
Nonaccrual loans