Fair Value Measurements (Schedule of Fair Value Disclosures Measured On Nonrecurring Basis) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Collateral Dependent Impaired Loans	$ 39		$ 1,349
Loans Nonrecurring Basis Gains (Losses)	(12)	$ (340)
Mortgage servicing rights	5,105		3,106
Mortgage Servicing Rights Nonrecurring Basis Gains (Losses)	9	7
Foreclosed assets	0		95
Foreclosed Assets Nonrecurring Basis Gains (Losses)	0	(29)
Long-lived assets	914		1,316
Long Lived Assets Nonrecurring Basis Gains (Losses)	(552)	$ (193)
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	39		1,349
Mortgage servicing rights	5,105		3,106
Foreclosed assets	0		95
Long-lived assets	$ 914		$ 1,316