Mortgage Banking Operations (SF MSR roll forward)(Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	$ 153,128
Additions from loan sales, single family loans	8,076		18,349
Changes in Fair Value of Mortgage Servicing Rights Due to Modeled Amortization	(5,968)	[1]	(5,675)	[1]
Servicing Asset at Fair Value, Other Changes in Fair Value	(5,409)	[2]	4,148	[2]
Ending balance	149,646
Single family mortgage servicing rights [Member]
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	153,128		87,396
Additions from loan sales, single family loans	(7,893)		(16,806)
Purchase	(2)		(3)
Changes in Fair Value of Mortgage Servicing Rights Due to Modeled Amortization	(5,968)	[1]	(5,675)	[1]
Net additions and amortization of servicing assets	1,927		11,134
Servicing Asset at Fair Value, Other Changes in Fair Value	(5,409)	[2]	4,148	[2]
Ending balance	$ 149,646		$ 102,678

[1] Represents changes due to collection/realization of expected cash flows and curtailments.

[2] Principally reflects changes in model assumptions, including prepayment speed assumptions, which are primarily affected by changes in mortgage interest rates.