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Presentation of Financial Information - Additional Details (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Gross interchange and debit card transaction fees	$ 419,000		$ 1,153,000,000
Network costs	275,000	$ 163,000	742,000	$ 391,000
Interchange and debit card transaction fees	$ 144,167	$ 232,607	$ 410,921	$ 648,329