Fair Value Measurements (Schedule of Fair Value Disclosures Measured On Nonrecurring Basis) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	$ 175	$ 2,044
Loans Nonrecurring Basis Gains (Losses)	(118)	(550)
Mortgage servicing rights	5,463	3,646
Mortgage Servicing Rights Nonrecurring Basis Gains (Losses)	9	6
Foreclosed assets	47	75
Foreclosed Assets Nonrecurring Basis Gains (Losses)	(47)	(58)
Long-lived assets	914	1,834
Long Lived Assets Nonrecurring Basis Gains (Losses)	(552)	(343)
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	175	2,044
Mortgage servicing rights	5,463	3,646
Foreclosed assets	47	75
Long-lived assets	$ 914	$ 1,834