Revenue Recognition - Additional Information (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Service charges on deposits									$ 1,132,000	$ 1,695,000	$ 1,897,000
Noninterest income	$ 3,392,000	$ 3,021,000	$ 2,062,000	$ 2,296,000	$ 2,513,000	$ 2,733,000	$ 2,647,000	$ 3,533,000	10,771,000	11,426,000	$ 9,329,000
Service Fees and Transaction-Based Fees Income
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Service charges on deposits									$ 754,000	$ 736,000
Percentage on revenue									1.30%	1.30%
Overdraft and NSF Fees Income
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Service charges on deposits									$ 378,000	$ 958,000
Percentage on revenue									0.70%	1.70%
Wire Transfer Fee Income
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Percentage on revenue									0.50%	0.60%
Noninterest income									$ 299,000	$ 320,000