Fair Value Measurements (Schedule of Fair Value Disclosures Measured On Nonrecurring Basis) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	$ 1,468	$ 1,756
Loans Nonrecurring Basis Gains Losses	(336)	(1,626)
Mortgage servicing rights	4,245	2,533
Mortgage Servicing Rights Nonrecurring Basis Gains Losses	6	(7)
Foreclosed assets	50	47
Foreclosed Assets Nonrecurring Basis Gains Losses	(83)	(66)
Long-lived assets	3,033	2,232
Long Lived Assets Nonrecurring Basis Gains Losses	(1,167)	(1,001)
Fair Value, Inputs, Level 1 [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	0	0
Mortgage servicing rights	0	0
Foreclosed assets	0	0
Long-lived assets	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	0	0
Mortgage servicing rights	0	0
Foreclosed assets	0	0
Long-lived assets	0	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	1,468	1,756
Mortgage servicing rights	4,245	2,533
Foreclosed assets	50	47
Long-lived assets	$ 3,033	$ 2,232