Carrying Amounts and Fair Value of Financial Instruments (Summary of the carrying value and estimated fair value of financial instruments) (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Financial Assets:
Cash And Cash Equivalents	$ 13,555,000	$ 18,025,000
Cash and Cash Equivalents	13,555,265	18,025,409	$ 15,606,530	$ 12,536,311
Certificates of Deposits With Other Banks	100,000	350,000
Investments	650,254,408	607,578,795
Investment And Mortgage-Backed Securities	650,688,000	608,530,000
Loans Receivable, Net	500,748,000	481,450,000
FHLB Stock	963,000	2,354,000
Federal Home Loan Bank ("FHLB") Stock, at Cost	962,600	2,354,000
Financial Liabilities:
Checking, Savings, And Money Market Accounts	861,081,000	737,571,000
Certificate Accounts, Carrying Value	155,486,000	180,525,000
Certificate Accounts	155,831,000	181,487,000
Advances from FHLB	10,000,000	35,000,000
Advances From FHLB	10,068,000	35,200,000
Other Borrowed Money	26,608,000	13,117,000
Other Borrowings	26,607,702	13,117,030
Junior Subordinated Debentures	5,155,000	5,155,000
Interest-bearing Deposits in Banks and Other Financial Institutions	100,005	350,005
Fair Value, Inputs, Level 1
Financial Assets:
Cash And Cash Equivalents		18,025,000
Cash and Cash Equivalents	13,555,000
Certificates of Deposits With Other Banks	0	0
Investment And Mortgage-Backed Securities	0	0
Loans Receivable, Net	0	0
FHLB Stock		2,354,000
Federal Home Loan Bank ("FHLB") Stock, at Cost	963,000
Financial Liabilities:
Checking, Savings, And Money Market Accounts	861,081,000	737,571,000
Certificate Accounts	0	0
Advances From FHLB	0	0
Other Borrowed Money		13,117,000
Other Borrowings	26,608,000
Junior Subordinated Debentures	0	0
Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Cash And Cash Equivalents	0	0
Certificates of Deposits With Other Banks		350,000
Certificates of Deposit with Other Banks	100,000
Investment And Mortgage-Backed Securities	650,688,000	608,530,000
Loans Receivable, Net	0	0
FHLB Stock	0	0
Financial Liabilities:
Checking, Savings, And Money Market Accounts	0	0
Certificate Accounts	155,831,000	181,487,000
Advances From FHLB	10,068,000	35,200,000
Other Borrowed Money	0	0
Junior Subordinated Debentures	5,155,000	5,155,000
Fair Value, Inputs, Level 3
Financial Assets:
Cash And Cash Equivalents	0	0
Certificates of Deposits With Other Banks	0	0
Investment And Mortgage-Backed Securities	0	0
Loans Receivable, Net	500,748,000	481,450,000
FHLB Stock	0	0
Financial Liabilities:
Checking, Savings, And Money Market Accounts	0	0
Certificate Accounts	0	0
Advances From FHLB	0	0
Other Borrowed Money	0	0
Junior Subordinated Debentures	$ 0	$ 0