Investment Securities (Narrative) (Details) - USD ($)	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Investment Securities [Abstract]
Realized gains or losses on sales and calls	$ 0	$ 0
Securities pledged to secure available borrowings with the Federal Reserve Bank and Federal Home Loan Bank	$ 16,000,000.0		$ 21,300,000

Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563

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