Mortgage Banking Operations (Servicing income)(Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Servicing Fees and Other	$ 9,849		$ 7,607
Changes in Fair Value of Mortgage Servicing Rights Due to Modeled Amortization	(5,968)	[1]	(5,675)	[1]
Amortization of Mortgage Servicing Rights (MSRs)	424		(490)
Net Servicing Income	3,457		1,442
Servicing Asset at Fair Value, Other Changes in Fair Value	(5,409)	[2]	4,148	[2]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	8,463		(3,883)
Mortgage servicing rights, risk management	4,488		1,630
Servicing Fees, Net	7,945		3,072
Servicing Contracts [Member]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ 9,897	[3]	$ (2,518)	[3]

[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.

[3] Comprised of interest rate swaps, interest rate swaptions and forward contracts used as an economic hedge of single family MSRs