Carrying Amounts and Fair Value of Financial Instruments (Summary of the carrying value and estimated fair value of financial instruments) (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Financial Assets:
Cash And Cash Equivalents	$ 20,110,000	$ 10,320,000
Cash and Cash Equivalents	20,109,901	10,319,624	$ 15,158,779	$ 9,374,549
Certificates of Deposits With Other Banks	1,950,000	1,950,000
Investments	396,044,320	412,054,876
Certificates of Deposit with Other Banks	1,950,010	1,950,010
Investment And Mortgage-Backed Securities	395,452,000	412,029,000
Loans Receivable, Net	423,979,788	390,493,197
Loans Receivable, Net	414,125,000	386,613,000
FHLB Stock	2,486,000	2,932,000
Federal Home Loan Bank (FHLB) Stock, at Cost	2,485,700	2,931,900
Financial Liabilities:
Checking, Savings, And Money Market Accounts	511,154,000	472,015,000
Certificate Accounts, Carrying Value	239,844,000	230,092,000
Certificate Accounts	236,693,000	227,949,000
Advances From FHLB	39,000,000	51,680,000
Advances From FHLB	38,602,000	51,318,000
Other Borrowed Money	12,652,000	11,307,000
Notes Payable	3,900,000	8,500,000
Other Borrowings	12,652,270	11,307,161
Notes Payable, Fair Value Disclosure	3,900,000	8,500,000
Senior Convertible Debentures	6,064,000	6,064,000
Junior Subordinated Debentures	5,155,000	5,155,000
Fair Value, Inputs, Level 1
Financial Assets:
Cash And Cash Equivalents		10,320,000
Cash and Cash Equivalents	20,110,000
Certificates of Deposits With Other Banks	0	0
Investment And Mortgage-Backed Securities	0	0
Loans Receivable, Net	0	0
FHLB Stock		2,932,000
Federal Home Loan Bank (FHLB) Stock, at Cost	2,486,000
Financial Liabilities:
Checking, Savings, And Money Market Accounts	511,154,000	472,015,000
Certificate Accounts	0	0
Advances From FHLB	0	0
Other Borrowed Money		11,307,000
Other Borrowings	12,652,000
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		1,950,000
Certificates of Deposit with Other Banks	1,950,000
Investment And Mortgage-Backed Securities	395,452,000	412,029,000
Loans Receivable, Net	0	0
FHLB Stock	0	0
Financial Liabilities:
Checking, Savings, And Money Market Accounts	0	0
Certificate Accounts	236,693,000	227,949,000
Advances From FHLB	38,602,000	51,318,000
Other Borrowed Money	0	0
Notes Payable, Fair Value Disclosure	3,900,000	8,500,000
Senior Convertible Debentures	6,064,000	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	414,125,000	386,613,000
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