Securities, Pooled Trust Preferred Securities (Details) - USD ($) $ in Thousands		Mar. 31, 2018		Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Cost, net of OTTI		$ 70,817		$ 72,198
Fair value		69,683		72,153
Cumulative Amount of OTTI		657		1,201
Pooled Trust Preferred Securities II [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost, net of OTTI		1,698
Fair value	[1]	$ 1,850
Percent of Underlying Collateral Performing		81.00%
Percent of Underlying Collateral in Deferral		2.90%
Percent of Underlying Collateral in Default		16.10%
Cumulative Amount of OTTI		$ 321
Cumulative Other Comprehensive Income, net of tax		(101)
Pooled Trust Preferred Securities III [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost, net of OTTI		664
Fair value	[1]	$ 825
Percent of Underlying Collateral Performing		88.80%
Percent of Underlying Collateral in Deferral		4.40%
Percent of Underlying Collateral in Default		6.80%
Cumulative Amount of OTTI		$ 336
Cumulative Other Comprehensive Income, net of tax		(106)
Corporate Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost, net of OTTI		2,362		3,816
Fair value		2,675	[1]	$ 4,139
Cumulative Amount of OTTI		657
Cumulative Other Comprehensive Income, net of tax		$ (207)

[1] Current Moody’s Ratings is B2.