Transfers of Financial Assets and Mortgage Servicing Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Proceeds from sale of loans held for sale	$ 786,658,000		$ 750,470,000		$ 315,068,000
Servicing rights	690,300,000		618,500,000
Gain on sale for loans held for sale	16,359,000		23,037,000		4,905,000
Residential Mortgage [Member]
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Proceeds from sale of loans held for sale	773,900,000		746,200,000		305,500,000
Gain on sale for loans held for sale	16,600,000		22,500,000		4,100,000
Servicing rights retained	2,400,000,000		2,100,000,000
Loan servicing fees	3,000,000		1,900,000		4,100,000
Commercial Loan [Member]
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Proceeds from sale of loans held for sale	12,800,000		4,200,000		9,500,000
Gain on sale for loans held for sale	(200,000)		500,000		800,000
Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgage [Member]
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Mortgage servicing assets	$ 20,983,000	[1]	$ 14,027,000	[1]

[1] The carrying amount of mortgage servicing assets is net of $0.2 million and $1.8 million reserves at December 31, 2013 and December 31, 2012, respectively. The estimated fair value does not include such adjustments.