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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

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