Loans and Leases and Allowance for Credit Losses - Components of net investment in leases (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Minimum future lease payments receivable	$ 39,709	$ 31,915
Estimated residual value of leased equipment	3,631	3,593
Initial direct costs	842	827
Security deposits	(989)	(1,189)
Purchase accounting premium	273	806
Unearned income	(6,088)	(5,568)
Net investment in leases	$ 37,378	$ 30,384