Employee Benefit Plans - Additional Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) Director	Sep. 30, 2019 USD ($) Director	Sep. 30, 2020 USD ($) Hour Installment Director	Sep. 30, 2019 USD ($) Director	Dec. 31, 2019 USD ($)
401(k) Plan [Abstract]
Minimum age to participate			18 years
Minimum working hours to participate | Hour			20
Annual contribution per employee			100.00%
Employer matching contribution percentage on first 6% of deferred compensation			100.00%
Percent of employee's compensation deferred that receives company match			6.00%
Additional safe harbor contribution by employer, percent			3.00%
401(k) expenses	$ 176,000	$ 181,000	$ 582,000	$ 592,000
Deferred Compensation Plan [Abstract]
Number of directors participating in Deferred Compensation Plan | Director	0	0	0	0
Bank-owned life insurance	$ 90,000	$ 92,000	$ 270,000	$ 275,000
Accrued liability for deferred compensation program	155,000		155,000		$ 153,000
Former Key Employee [Member]
Deferred Compensation Plan [Abstract]
Deferred compensation expense	6,000	20,000	21,000	57,000
Bank-owned life insurance	7,000	7,000	21,000	21,000
Cash surrender value of life insurance policies	1,400,000		$ 1,400,000		1,400,000
Maximum [Member]
401(k) Plan [Abstract]
Employer matching contribution			6.00%
Deferred Compensation Plan [Abstract]
Number of installments for contributions | Installment			5
Minimum [Member]
Deferred Compensation Plan [Abstract]
Number of installments for contributions | Installment			1
Supplemental Executive Retirement Plan [Member]
Supplemental Executive Retirement Plan [Abstract]
Pension liability	2,900,000		$ 2,900,000		$ 2,900,000
Pension expense	$ 71,000	$ 75,000	$ 213,000	$ 222,000