Investment and Mortgage-Backed Securities, Held to Maturity (Narrative) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Proceeds from Sale of Held-to-maturity Securities	$ 0
Held-to-maturity Securities, Fair Value	25,568,343	$ 25,371,052
Held-to-maturity Securities Pledged as Collateral	23,400,000	23,200,000
Held to maturity pledged as collateral, fair value	23,700,000	23,000,000
US Government Agencies Debt Securities [Member]
Held-to-maturity Securities, Fair Value	14,100,000	16,200,000
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	$ 13,900,000	$ 16,300,000