Investment and Mortgage-Backed Securities, Held to Maturity (Narrative) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Proceeds from Sale of Held-to-maturity Securities	$ 0
Held-to-maturity Securities, Fair Value	27,312,340	$ 25,371,052
Held-to-maturity Securities Pledged as Collateral	20,800,000	23,200,000
Held to maturity pledged as collateral, fair value	21,000,000	23,000,000
US Government Agencies Debt Securities [Member]
Held-to-maturity Securities, Fair Value	14,600,000	16,200,000
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	$ 14,500,000	$ 16,300,000