Loans and Allowance for Loan Losses - Loans outstanding by portfolio segment (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Loans and Allowance for Loan Losses
Total loans	$ 2,034,197	$ 1,721,279
Deferred loan fees and costs	10,300	1,000
PPP Loans
Loans and Allowance for Loan Losses
Total loans	347,300
Deferred loan fees and costs	9,600
Commercial
Loans and Allowance for Loan Losses
Total loans	1,344,652	1,000,225
Consumer
Loans and Allowance for Loan Losses
Total loans	689,545	721,054
Commercial and industrial | Commercial
Loans and Allowance for Loan Losses
Total loans	794,204	479,144
Real estate construction | Commercial
Loans and Allowance for Loan Losses
Total loans	31,344	26,378
Residential | Consumer | Real estate first mortgage
Loans and Allowance for Loan Losses
Total loans	456,737	457,155
Residential | Consumer | Real estate junior lien
Loans and Allowance for Loan Losses
Total loans	154,351	177,373
Commercial real estate | Commercial
Loans and Allowance for Loan Losses
Total loans	519,104	494,703
Other revolving and installment | Consumer
Loans and Allowance for Loan Losses
Total loans	$ 78,457	$ 86,526