Mortgage Servicing Rights and Mortgage Servicing Activity (Changes in the Carrying Amount of Mortgage Servicing Rights) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended			12 Months Ended
	Jun. 30, 2015		Jun. 30, 2014	Jun. 30, 2015		Jun. 30, 2014	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor Servicing Assets or Liabilities Impact of Twenty Five Percent Adverse Change in Prepayment Speed	$ 1,363			$ 1,363
Mortage Servicing Rights Amortized Value [Roll Forward]
Mortgage Servicing Rights Beginning of Period	21,490		$ 22,469	22,011		$ 22,760	$ 22,760
Mortgage Servicing Rights Additions	63		643	533		1,207
Amortization of Mortgage Servicing Rights (MSRs)	(918)		(962)	(1,909)		(1,817)
Mortgage Servicing Rights, End of Period	20,635		22,150	20,635		22,150	22,011
Mortage Servicing Rights Valuation Rollforward [Roll Forward]
Mortgage Servicing rights Valuation Allowance Beginning of Period	1,131		425	955		282	282
Mortgage Servicing Rights (MSR) Impairment (Recovery)	641		137	(465)		280	(700)
Mortgage Servicing rights Valuation Allowance, End of Period	490		562	490		562	955
Mortgage Servicing Rights Net Carrying balance	20,145		21,588	20,145		21,588	21,100
Fair Value of Mortgage Servicing Rights	20,809	[1]	21,987	20,809	[1]	21,987	21,228	[1]
Level 3
Mortage Servicing Rights Valuation Rollforward [Roll Forward]
Fair Value of Mortgage Servicing Rights	20,809		21,987	20,809		21,987	$ 21,228
Residential Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Servicing Asset	$ 2,500,000		$ 2,700,000	$ 2,500,000		$ 2,700,000

[1] (2) MSRs with a recorded investment of $20.6 million were reduced by a specific valuation allowance totaling $0.5 million to a reported carrying value of $20.1 million resulting in recognition of $0.6 million in recoveries included in loan sales and servicing income in the three months ended June 30, 2015.