Premises and Equipment - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Amortization of right-of-use assets, finance leases	$ 13	$ 18	$ 49	$ 58
Interest on lease liabilities, finance leases	1	2	3	6
Operating lease cost	473	482	1,594	1,489
Short-term lease cost	0	16	26	57
Variable lease cost	10	10	30	30
Total lease cost	$ 497	$ 528	$ 1,702	$ 1,640