Revenue Recognition - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Service charges on deposits	$ 483,867	$ 393,685	$ 1,418,857	$ 1,201,075
Noninterest income	$ 2,284,009	$ 2,255,017	7,279,577	$ 6,708,165
Service Fees and Transaction-Based Fees Income
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Service charges on deposits			$ 558,000
Percentage on revenue			1.50%
Overdraft and NSF Fees Income
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Service charges on deposits			$ 861,000
Percentage on revenue			2.30%
Wire Transfer Fee Income
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Percentage on revenue			0.70%
Noninterest income			$ 243,000