Fair Value of Assets and Liabilities - Fair Value Measurements on a Non-Recurring Basis (Details) - Nonrecurring Measurements - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets with a recorded change from re-measuring at fair value on a non-recurring basis
Other real estate owned	$ 564	$ 1,983
Collateral-dependent impaired loans, net of ACL	26,749	23
Total assets measured at fair value on a recurring basis	27,313	2,006
Level 1
Assets with a recorded change from re-measuring at fair value on a non-recurring basis
Other real estate owned	0	0
Collateral-dependent impaired loans, net of ACL	0	0
Total assets measured at fair value on a recurring basis	0	0
Level 2
Assets with a recorded change from re-measuring at fair value on a non-recurring basis
Other real estate owned	0	0
Collateral-dependent impaired loans, net of ACL	0	0
Total assets measured at fair value on a recurring basis	0	0
Level 3
Assets with a recorded change from re-measuring at fair value on a non-recurring basis
Other real estate owned	564	1,983
Collateral-dependent impaired loans, net of ACL	26,749	23
Total assets measured at fair value on a recurring basis	$ 27,313	$ 2,006