Employee Benefits (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Common Stock [Member]
Share-based Compensation [Abstract]
Shares acquired and canceled (in shares)	(38,160)	0	(831,254)	0
Shares acquired and canceled	$ (1)	$ 0	$ (9)	$ 0
Common Stock [Member] | Employees [Member]
Share-based Compensation [Abstract]
Shares acquired and canceled (in shares)			(149,425)
Retained Earnings [Member]
Share-based Compensation [Abstract]
Shares acquired and canceled	(300)	0	$ (7,107)	0
Retained Earnings [Member] | Employees [Member]
Share-based Compensation [Abstract]
Shares acquired and canceled			$ (2,600)
Percentage of employee's compensation matched by company			5.00%
Defined benefit plan, employer contribution	$ 69	$ 55	$ 114	121
Percentage of contribution in shares by largest shareholder			6.50%
Number of shares contributed by the largest shareholder (in shares)			656,925
Stock-based compensation expense			$ 371	329
Shares acquired and canceled (in shares)	(831,254)	0
Executive Officers [Member]
Share-based Compensation [Abstract]
Stock-based compensation expense			11,800
2018 Equity Incentive Plan [Member]
Share-based Compensation [Abstract]
Stock-based compensation expense	$ 191	$ 158	$ 371	$ 329
Shares available for future grants (in shares)	702,500		702,500
Unearned stock-based compensation expense [Abstract]
Risk-free interest rate			1.71%	2.48%
Dividend yield			2.20%	2.20%
Stock price volatility			41.27%	31.14%
Expected term			7 years 6 months 4 days	7 years 4 days
2018 Equity Incentive Plan [Member] | RSUs [Member]
Share-based Compensation [Abstract]
Unrecognized compensation expense	$ 2,100		$ 2,100
Period for recognition of compensation cost not yet recognized			3 years 6 months
Restricted Stock Units [Roll Forward]
Outstanding, beginning of the period (in shares)			104,000
Shares granted (in shares)			31,000
Shares settled (in shares)			0
Shares forfeited (in shares)			0
Outstanding, end of the period (in shares)	135,000		135,000
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, beginning of period (in dollars per share)			$ 19.09
Shares granted (in dollars per share)			18.49
Shares settled (in dollars per share)			0
Shares forfeited (in dollars per share)			0
Outstanding, end of period (in dollars per share)	$ 18.95		$ 18.95
2018 Equity Incentive Plan [Member] | Stock Option [Member]
Share-based Compensation [Abstract]
Vesting period			4 years
Unrecognized compensation expense	$ 457		$ 457
Unvested and unexercised stock options (in shares)	186,500		186,500
Period for recognition of compensation cost not yet recognized			2 years 8 months 16 days
Stock Option Activity [Roll Forward]
Outstanding at beginning of period (in shares)			163,000
Options granted (in shares)			26,500
Options exercised (in shares)			0
Options forfeited (in shares)			(3,000)
Outstanding at end of period (in shares)	186,500		186,500
Exercisable at end of period (in shares)	40,000		40,000
Weighted Average Exercise Price [Roll Forward]
Outstanding at beginning of period (in dollars per share)			$ 18.75
Options granted (in dollars per share)			18.49
Options exercised (in dollars per share)			0
Options forfeited (in dollars per share)			17.42
Outstanding at end of period (in dollars per share)	$ 18.73		18.73
Exercisable at end of period (in dollars per share)	$ 18.77		$ 18.77
Options, Additional Disclosures [Abstract]
Weighted average remaining contractual term, Outstanding			8 years 5 months 12 days
Weighted average remaining contractual term, Exercisable			8 years 3 months 11 days
Aggregate intrinsic value, Outstanding	$ 0		$ 0
Aggregate intrinsic value, Exercisable	$ 0		$ 0
2018 Equity Incentive Plan [Member] | Minimum [Member] | RSUs [Member]
Share-based Compensation [Abstract]
Vesting period			3 years
2018 Equity Incentive Plan [Member] | Maximum [Member] | RSUs [Member]
Share-based Compensation [Abstract]
Vesting period			5 years