Investment Securities (Schedule of Gross Realized Gains (Losses) on Sales of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Securities Financing Transactions Disclosures [Abstract]
Realized gains	$ 11	$ 77	$ 111	$ 200
Realized losses	(7)	(65)	(9)	(180)
Net gains	$ 4	$ 12	$ 102	$ 20

This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

No definition available.

Name:	us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration