Leases - Lease right-of-use assets and liabilities (Details) $ in Thousands	Dec. 31, 2021 USD ($) item	Dec. 31, 2020 USD ($)
Leases
Number of finance leases | item	1
Lease Right-of-Use Assets
Operating lease right-of-use assets	$ 3,727	$ 6,918
Finance lease right-of-use assets	$ 87	$ 202
Finance Lease, Right-of-Use Asset, balance sheet location	Land, premises and equipment, net	Land, premises and equipment, net
Lease right-of-use assets	$ 3,814	$ 7,120
Operating lease liabilities	4,275	7,861
Finance lease liabilities	$ 203	$ 430
Finance lease liabilities, balance sheet location	Long-term debt	Long-term debt
Lease liabilities	$ 4,478	$ 8,291