Accumulated Other Comprehensive Income (Loss) - Summary of Significant Amounts Reclassified out off Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Net loss (gain) on sale of securities	$ 6,229	$ (38,961)
Interest expense - Federal Home Loan Bank advances	140,259	90,728
Income tax expense (benefit)	(47,168)	796,245
Net of tax	(332,058)	(1,583,846)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Losses on Cash Flow Hedges
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Interest expense - money market	105,000	37,000
Interest expense - Federal Home Loan Bank advances	49,000	49,000
Net of tax	154,000	86,000
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains and Losses on Available for Sale Securities
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Net loss (gain) on sale of securities	6,000	(39,000)
Income tax expense (benefit)	(2,000)	15,000
Net of tax	4,000	(24,000)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Losses on Securities Transferred to Held to Maturity
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Interest income - securities	42,000	42,000
Income tax expense (benefit)	(16,000)	(16,000)
Net of tax	$ 26,000	$ 26,000