Fair Value of Financial Instruments - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Financial Assets:
Cash and cash equivalents	$ 95,786,737	$ 63,249,952
Loans held for sale	3,522,564	17,203,060
Loans receivable, net	835,844,908	731,436,572
Accrued interest receivable	2,782,502	2,463,486
Other investments:
Mutual fund - CRA qualified	2,449,180
Financial Liabilities:
Deposit	896,183,708	773,071,521
FHLB Advances		25,000,000
Accrued interest payable	1,195,818	423,239
Carrying Amount
Financial Assets:
Cash and cash equivalents	95,786,737	63,249,952
Loans held for sale	3,253,500	15,739,305
Loans receivable, net	840,467,479	738,884,413
Accrued interest receivable	2,782,502	2,463,486
Other investments:
FHLB and PCBB stock	4,771,700	4,286,500
Financial Liabilities:
Deposit	896,890,701	773,306,014
FHLB Advances		25,000,000
Accrued interest payable	1,195,818	423,239
Level 1
Financial Assets:
Cash and cash equivalents	95,786,737	63,249,952
Accrued interest receivable	456
Level 2
Financial Assets:
Loans held for sale	3,522,564	17,203,060
Accrued interest receivable	221,214	189,005
Financial Liabilities:
Deposit	896,183,708	773,071,521
FHLB Advances		25,000,000
Accrued interest payable	1,195,818	423,239
Level 3
Financial Assets:
Loans receivable, net	835,844,908	731,436,572
Accrued interest receivable	$ 2,560,832	$ 2,274,481