Securities Available-for-Sale (Securities in a Continuous Unrealized Loss Position) (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Fair value
Up to 12 months	$ 16,299,969	$ 11,847,512
Greater than 12 months	23,801,874	23,312,572
Total	40,101,843	35,160,084
Gross unrealized loss
Up to 12 months	431,230	98,854
Greater than 12 months	984,610	501,299
Total	1,415,840	600,153
U.S. agency securities
Fair value
Up to 12 months	953,916	989,537
Greater than 12 months	239,225	244,248
Total	1,193,141	1,233,785
Gross unrealized loss
Up to 12 months	36,120	29
Greater than 12 months	10,629	5,533
Total	46,749	5,562
Mortgage-backed securities
Fair value
Up to 12 months	6,279,611	5,944,732
Greater than 12 months	21,395,759	20,843,664
Total	27,675,370	26,788,396
Gross unrealized loss
Up to 12 months	122,161	80,034
Greater than 12 months	896,411	467,143
Total	1,018,572	547,177
Municipal bonds
Fair value
Up to 12 months	9,066,442	4,913,243
Greater than 12 months	2,166,890	2,224,660
Total	11,233,332	7,137,903
Gross unrealized loss
Up to 12 months	272,949	18,791
Greater than 12 months	77,570	28,623
Total	$ 350,519	$ 47,414

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