Investment Securities (Available-for-sale Securities Gross Realized Gains and Losses) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Gross gains and gross losses realized from sales of available-for-sale securities:
Gross gains realized	$ 297	$ 65	$ 636	$ 384
Gross losses realized	(499)	(3)	(1,174)	(3)
Net (loss) gain realized	$ (202)	$ 62	$ (538)	$ 381

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.

No definition available.

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