Fair Value of Assets and Liabilities - Fair Value Measurements on a Non-Recurring Basis (Details) - Non-Recurring Measurements - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets with a recorded change resulting from re-measuring at fair value on a non-recurring basis
Other real estate owned		$ 564
Collateral-dependent impaired loans, net of ACL	$ 28,651	26,749
Total assets measured at fair value on a recurring basis		27,313
Level 1
Assets with a recorded change resulting from re-measuring at fair value on a non-recurring basis
Other real estate owned		0
Collateral-dependent impaired loans, net of ACL	0	0
Total assets measured at fair value on a recurring basis		0
Level 2
Assets with a recorded change resulting from re-measuring at fair value on a non-recurring basis
Other real estate owned		0
Collateral-dependent impaired loans, net of ACL	0	0
Total assets measured at fair value on a recurring basis		0
Level 3
Assets with a recorded change resulting from re-measuring at fair value on a non-recurring basis
Other real estate owned		564
Collateral-dependent impaired loans, net of ACL	$ 28,651	26,749
Total assets measured at fair value on a recurring basis		$ 27,313