Fair Value Measurements (Unobservable Inputs Used in Level 3 Fair Value Measurements) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Maximum | Loans With Impairment [Member]
Fair Value Inputs Discount Rate One	50.00%	50.00%
Maximum | Other Real Estate Owned [Member]
Fair Value Inputs Discount Rate One	50.00%	50.00%
Minimum | Loans With Impairment [Member]
Fair Value Inputs Discount Rate One	0.00%	0.00%
Minimum | Other Real Estate Owned [Member]
Fair Value Inputs Discount Rate One	0.00%	0.00%
Weighted Average [Member] | Loans With Impairment [Member]
Fair Value Inputs Discount Rate One	(32.00%)	(29.00%)
Weighted Average [Member] | Other Real Estate Owned [Member]
Fair Value Inputs Discount Rate One	(10.00%)	(14.00%)
Fair Value, Inputs, Level 3 [Member] | Loans With Impairment [Member]
Assets, Fair Value Disclosure	$ 2,217	$ 2,887
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Assets, Fair Value Disclosure	$ 10,949	$ 8,111