Transfers of Financial Assets and Mortgage Servicing Assets - Narrative (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Number of days required to repurchase mortgage loans				90 days
Residential Mortgage [Member]
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Retained servicing rights	$ 2,400,000,000			$ 2,400,000,000			$ 2,400,000,000
Bank servicing fees	700,000		400,000	1,400,000		2,500,000
Residential Mortgage [Member] | Fair Value, Measurements, Nonrecurring [Member]
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Mortgage servicing assets	$ 19,651,000	[1]		$ 19,651,000	[1]		$ 20,983,000	[1]

[1] The carrying amount of mortgage servicing assets is net of $11 thousand and $0.2 million reserves at September 30, 2014 and December 31, 2013, respectively. The estimated fair value does not include such adjustments.