Revenue Recognition - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Service charges on deposits	$ 448,000	$ 537,000
Noninterest income	3,583,000	2,212,000
Service Fees and Transaction-Based Fees Income
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Service charges on deposits	$ 172,000	$ 193,000
Percentage on revenue	1.20%	1.60%
Overdraft and NSF Fees Income
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Service charges on deposits	$ 276,000	$ 344,000
Percentage on revenue	1.90%	2.90%
Wire Transfer Fee Income
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Percentage on revenue	0.50%	0.70%
Noninterest income	$ 79,000	$ 77,000