Carrying Amounts and Fair Value of Financial Instruments (Summary of the carrying value and estimated fair value of financial instruments) (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Financial Assets:
Cash And Cash Equivalents	$ 19,120,000	$ 12,706,000
Cash and Cash Equivalents	19,120,091	12,705,910	$ 15,598,549	$ 10,319,624
Certificates of Deposits With Other Banks	950,000	1,200,000
Investments	425,789,569	409,893,850
Certificates of Deposit with Other Banks	950,010	1,200,010
Investment And Mortgage-Backed Securities	425,871,000	409,505,000
Loans Receivable, Net	429,313,593	430,053,517
Loans Receivable, Net	424,599,000	421,379,000
FHLB Stock	1,926,000	2,204,000
Federal Home Loan Bank (FHLB) Stock, at Cost	1,926,400	2,204,000
Financial Liabilities:
Checking, Savings, And Money Market Accounts	535,123,000	529,043,000
Certificate Accounts, Carrying Value	253,735,000	238,454,000
Certificate Accounts	252,129,000	236,103,000
Advances From FHLB	26,000,000	34,030,000
Advances From FHLB	25,854,000	33,771,000
Other Borrowed Money	14,044,000	10,698,000
Notes Payable	1,512,500	2,362,500
Other Borrowings	14,044,252	10,698,429
Notes Payable, Fair Value Disclosure	1,513,000	2,363,000
Senior Convertible Debentures	6,044,000	6,064,000
Junior Subordinated Debentures	5,155,000	5,155,000
Fair Value, Inputs, Level 1
Financial Assets:
Cash And Cash Equivalents		12,706,000
Cash and Cash Equivalents	19,120,000
Certificates of Deposits With Other Banks	0	0
Investment And Mortgage-Backed Securities	0	0
Loans Receivable, Net	0	0
FHLB Stock		2,204,000
Federal Home Loan Bank (FHLB) Stock, at Cost	1,926,000
Financial Liabilities:
Checking, Savings, And Money Market Accounts	535,123,000	529,043,000
Certificate Accounts	0	0
Advances From FHLB	0	0
Other Borrowed Money		10,698,000
Other Borrowings	14,044,000
Senior Convertible Debentures	0	0
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		1,200,000
Certificates of Deposit with Other Banks	950,000
Investment And Mortgage-Backed Securities	425,871,000	409,505,000
Loans Receivable, Net	0	0
FHLB Stock	0	0
Financial Liabilities:
Checking, Savings, And Money Market Accounts	0	0
Certificate Accounts	252,129,000	236,103,000
Advances From FHLB	25,854,000	33,771,000
Other Borrowed Money	0	0
Notes Payable, Fair Value Disclosure	1,513,000	2,363,000
Senior Convertible Debentures	6,044,000	6,064,000
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	424,599,000	421,379,000
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
Senior Convertible Debentures	0	0
Junior Subordinated Debentures	$ 0	$ 0