Fair Value Of Financial Instruments - Qualitative Information About Level 3 Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Impaired Loans [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Fair Value Estimate	$ 861	$ 1,001
Impaired Loans [Member] | Significant Unobservable Inputs (Level III) [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Fair Value Estimate	$ 861	$ 1,001
Impaired Loans [Member] | Minimum [Member] | Significant Unobservable Inputs (Level III) [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Range (Weighted Average)	0.00%	0.00%
Impaired Loans [Member] | Maximum [Member] | Significant Unobservable Inputs (Level III) [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Range (Weighted Average)	(11.30%)	(27.30%)
Impaired Loans [Member] | Weighted Average [Member] | Significant Unobservable Inputs (Level III) [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Range (Weighted Average)	(0.40%)	(2.50%)
Foreclosed Real Estate [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Fair Value Estimate	$ 3	$ 1,716
Foreclosed Real Estate [Member] | Significant Unobservable Inputs (Level III) [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Fair Value Estimate	$ 3	$ 1,716
Range (Weighted Average)	(7.00%)	(7.00%)
Foreclosed Real Estate [Member] | Weighted Average [Member] | Significant Unobservable Inputs (Level III) [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Range (Weighted Average)	(7.00%)	(7.00%)