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Fair Value Measurements - Assets Measured at Fair Value (Details) - Non-Recurring - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral dependent $ 4,537 $ 4,893
Gain (loss) on impaired loans 0 (1,290)
Other real estate owned   220
Gain (loss) on other real estate owned   (52)
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral dependent 0 0
Other real estate owned   0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral dependent 4,537 4,893
Other real estate owned   220
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral dependent $ 0 0
Other real estate owned   $ 0