Loans - Nonaccrual loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Loans
Total loans on nonaccrual status	$ 88,383	$ 95,188
Greater than 90 Days Accruing	1,818
Non-accrual with no allowance	20,548
Other income producing property
Loans
Total loans on nonaccrual status	3,945	7,543
Greater than 90 Days Accruing	48
Non-accrual with no allowance	219
Commercial loans | Construction and land development
Loans
Total loans on nonaccrual status	1,857	2,421
Non-accrual with no allowance	522
Commercial loans | Commercial non-owner occupied
Loans
Total loans on nonaccrual status	20,098	5,470
Non-accrual with no allowance	9,334
Commercial loans | Commercial owner occupied real estate loan
Loans
Total loans on nonaccrual status	19,607	26,059
Greater than 90 Days Accruing	894
Non-accrual with no allowance	10,142
Commercial loans | Commercial and industrial
Loans
Total loans on nonaccrual status	5,688	9,218
Greater than 90 Days Accruing	876
Non-accrual with no allowance	190
Consumer portfolio loans | Consumer Owner Occupied Loans
Loans
Total loans on nonaccrual status	24,326	28,477
Non-accrual with no allowance	91
Consumer portfolio loans | Home equity loans
Loans
Total loans on nonaccrual status	8,592	9,926
Non-accrual with no allowance	50
Consumer portfolio loans | Consumer loans
Loans
Total loans on nonaccrual status	$ 4,270	$ 6,074