Fair Value Measurements (Schedule of Fair Value Disclosures Measured On Nonrecurring Basis) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	$ 230	$ 1,468
Loans Nonrecurring Basis Gains (Losses)	(197)	(336)
Mortgage servicing rights	6,008	4,245
Mortgage Servicing Rights Nonrecurring Basis Gains (Losses)	9	6
Foreclosed assets	0	50
Foreclosed Assets Nonrecurring Basis Gains (Losses)	0	(83)
Long-lived assets	2,319	3,033
Long Lived Assets Nonrecurring Basis Gains (Losses)	(858)	(1,167)
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	230	1,468
Mortgage servicing rights	6,008	4,245
Foreclosed assets	0	50
Long-lived assets	$ 2,319	$ 3,033