Other Intangible Assets (Schedule of Finite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Gross Carrying Amount
Total	$ 24,661	$ 24,661
Accumulated Amortization
Total	(19,706)	(17,897)
Net Carrying Amount
Total	4,955	6,764
Amortization of intangible assets	1,809	1,903	$ 1,306
Core Deposits [Member]
Gross Carrying Amount
Total	23,908	23,908
Accumulated Amortization
Total	(18,953)	(17,220)
Net Carrying Amount
Total	4,955	6,688
Trust Relationship [Member]
Gross Carrying Amount
Total	753	753
Accumulated Amortization
Total	(753)	(677)
Net Carrying Amount
Total	$ 0	$ 76