Fair Value Measurements - OREO Measured at Fair Value on a Nonrecurring Basis (Details) - Level 3 - Fair Value, measurements, nonrecurring - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
OREO measured at fair value on a nonrecurring basis
Carrying amount prior to remeasurement	$ 445	$ 4,051
Impairment recognized in results of operations	(275)	(1,315)
Fair value	$ 170	$ 2,736