Fair Value Measurements - Schedule of Differences between Fair Value and Principal Balance for Loans Held for Sale Measured at Fair Value (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Fair Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Mortgage loans held for sale measured at fair value	$ 452,794	$ 507,442
Aggregate Unpaid Principal Balance
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Mortgage loans held for sale measured at fair value	424,081	501,503
Difference
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Mortgage loans held for sale measured at fair value	$ 28,713	$ 5,939