Fair Value Measurements Assets and Liabilities Measured at Fair Value on a Non-recurring Basis (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	$ 46,529		$ 64,738
Mortgage servicing rights	62,436		63,280
Fair Value, Inputs, Level 1 [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	0		0
Fair Value, Inputs, Level 2 [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	46,529		64,738
Fair Value, Inputs, Level 3 [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	0		0
Fair Value, Measurements, Nonrecurring [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	46,529		64,738
Impaired Loans	83,470	[1]	88,049	[1]
Mortgage servicing rights	71,987		74,444
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	0		0
Impaired Loans	0	[1]	0	[1]
Mortgage servicing rights	0		0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	46,529		64,738
Impaired Loans	0	[1]	0	[1]
Mortgage servicing rights	0		0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	0		0
Impaired Loans	83,470	[1]	88,049	[1]
Mortgage servicing rights	$ 71,987		$ 74,444

[1] (1)        Represents individually evaluated impaired loans, net of the related allowance for loan losses.