Loans and Allowance for Loan Losses - Loans outstanding by portfolio segment (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Loans and Allowance for Loan Losses
Total loans	$ 2,058,419	$ 1,721,279
Deferred loan fees and costs	7,800	1,000
PPP Loans
Loans and Allowance for Loan Losses
Total loans	348,900
Deferred loan fees and costs	7,400
Commercial
Loans and Allowance for Loan Losses
Total loans	1,357,421	1,000,225
Consumer
Loans and Allowance for Loan Losses
Total loans	700,998	721,054
Commercial and industrial | Commercial
Loans and Allowance for Loan Losses
Total loans	789,036	479,144
Real estate construction | Commercial
Loans and Allowance for Loan Losses
Total loans	33,169	26,378
Residential | Consumer | Real estate first mortgage
Loans and Allowance for Loan Losses
Total loans	469,050	457,155
Residential | Consumer | Real estate junior lien
Loans and Allowance for Loan Losses
Total loans	152,487	177,373
Commercial real estate | Commercial
Loans and Allowance for Loan Losses
Total loans	535,216	494,703
Other revolving and installment | Consumer
Loans and Allowance for Loan Losses
Total loans	$ 79,461	$ 86,526