Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Mortgage servicing rights	$ 57,474		$ 61,341
Mortgage Servicing Rights (MSR) Impairment (Recovery)	2,120	$ (465)
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Commercial loans held for sale	30,694
Provision for Credit Losses, Commercial Loans held-for-sale	(451)
Mortgage loans held for sale	259,054		124,915
market valuation adjustment, loans held for sale	0		(155)
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Impaired loans	62,910		41,891
Provision for Credit Losses, Impaired Loans	(19,873)		(7,796)
Mortgage servicing rights	58,331		70,686
Mortgage Servicing Rights (MSR) Impairment (Recovery)	$ (2,120)		$ 425