Leases - Lease right-of-use assets and liabilities (Details) $ in Thousands	Mar. 31, 2021 USD ($) lease	Dec. 31, 2020 USD ($)
Leases
Number of finance leases | lease	1
Lease Right-of-Use Assets
Operating lease right-of-use assets	$ 6,293	$ 6,918
Finance lease right-of-use assets	$ 173	$ 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	$ 6,466	$ 7,120
Operating lease liabilities	7,140	7,861
Finance lease liabilities	$ 375	$ 430
Finance lease liabilities, balance sheet location	Long-term debt	Long-term debt
Lease liabilities	$ 7,515	$ 8,291