Investment and Mortgage-Backed Securities, Held to Maturity (Narrative) (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Held-to-maturity, Fair Value	$ 22,853,943	$ 19,205,287
Pledged Financial Instruments, Not Separately Reported, Other Debt Securities Held-to-maturity	9,200,000	13,400,000
Held to maturity pledged as collateral, fair value	9,900,000	14,300,000
US Government Agencies Debt Securities [Member]
Debt Securities, Held-to-maturity, Fair Value	6,400,000	8,700,000
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	$ 5,900,000	$ 8,100,000

Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953401-111524

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant