Fair Value (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Roll forward of liabilities measured using Level 3 inputs on a recurring basis
Transfers in or out the levels			$ 0
Recurring basis
Roll forward of assets measured using Level 3 inputs on a recurring basis
Balance at the beginning of the period	11,385	36,159	43,738	33,603
Repurchases			5,529
Repayments	(436)		(1,059)
Interest rate lock commitments issued, net	23,788	48,044	78,722	65,192
Purchases of MSR	1,116		5,124
Sales of MSR			(550)
Servicing received as proceeds from sales of mortgage loans	4,157	30	4,177	772
Changes in fair value included in income arising from:
Other factors	9,106	(2,111)	(17,355)	(5,230)
Total changes in fair value included in income	9,106	(2,111)	(17,355)	(5,230)
Transfers of interest rate lock commitments (asset) liability to mortgage loans acquired for sale	3,395	(27,449)	(65,815)	(39,664)
Balance at the end of the period	52,511	54,673	52,511	54,673
Recurring basis | Excess servicing spread financing
Roll forward of liabilities measured using Level 3 inputs on a recurring basis
Initial proceeds received from financing of excess servicing spread	2,828		2,828
Changes in fair value included in income	29		29
Balance at the end of the period	2,857		2,857
Changes in fair value recognized during the period relating to liability still held at the end of the period	29		29
Accumulated changes in fair value relating to liability still held at the end of the period	29		29
Recurring basis | Mortgage loans held for sale at fair value
Roll forward of assets measured using Level 3 inputs on a recurring basis
Balance at the beginning of the period	4,525
Repurchases			5,529
Repayments	(436)		(1,059)
Changes in fair value included in income arising from:
Other factors	96		(285)
Total changes in fair value included in income	96		(285)
Balance at the end of the period	4,185		4,185
Changes in fair value recognized during the period relating to assets still held at the end of the period	16		(344)
Accumulated changes in fair value relating to assets still held at the end of the period	96		(285)
Recurring basis | Mortgage servicing rights
Roll forward of assets measured using Level 3 inputs on a recurring basis
Balance at the beginning of the period	23,070	23,449	19,798	25,698
Purchases of MSR	1,116		5,124
Sales of MSR			(550)
Servicing received as proceeds from sales of mortgage loans	4,157	30	4,177	772
Changes in fair value included in income arising from:
Other factors	(1,575)	(2,239)	(1,781)	(5,230)
Total changes in fair value included in income	(1,575)	(2,239)	(1,781)	(5,230)
Balance at the end of the period	26,768	21,240	26,768	21,240
Changes in fair value recognized during the period relating to assets still held at the end of the period	(1,575)	(2,239)	(1,781)	(5,230)
Recurring basis | Net interest rate lock commitments
Roll forward of assets measured using Level 3 inputs on a recurring basis
Balance at the beginning of the period	(16,210)	12,710	23,940	7,905
Interest rate lock commitments issued, net	23,788	48,044	78,722	65,192
Changes in fair value included in income arising from:
Other factors	10,585	128	(15,289)
Total changes in fair value included in income	10,585	128	(15,289)
Transfers of interest rate lock commitments (asset) liability to mortgage loans acquired for sale	3,395	(27,449)	(65,815)	(39,664)
Balance at the end of the period	21,558	33,433	21,558	33,433
Changes in fair value recognized during the period relating to assets still held at the end of the period	21,558	33,433	21,558	33,433
Accumulated changes in fair value relating to assets still held at the end of the period	$ 21,558	$ 33,433	$ 21,558	$ 33,433