Employee Benefits - Summary of restricted stock activity (Details) - Restricted Stock	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Shares
Outstanding at beginning of year | shares	148,500
Granted | shares	110,500
Outstanding at period end | shares	259,000
Weighted Average Grant Date Fair Value
Outstanding at beginning of year | $ / shares	$ 22.56
Granted | $ / shares	25.50
Outstanding at period end | $ / shares	$ 23.81