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Fair Value Measurements and Disclosures - Off-balance sheet financial instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Commitments to extend credit    
Off-balance sheet financial instruments:    
Off-balance sheet financial instruments $ 421,399 $ 327,788
Letters of credit    
Off-balance sheet financial instruments:    
Off-balance sheet financial instruments 8,928 9,750
Carrying amount | Level 2 | Commitments to extend credit    
Off-balance sheet financial instruments:    
Off-balance sheet financial instruments 421,399 327,788
Carrying amount | Level 2 | Letters of credit    
Off-balance sheet financial instruments:    
Off-balance sheet financial instruments 8,928 9,750
Fair value | Level 2 | Commitments to extend credit    
Off-balance sheet financial instruments:    
Off-balance sheet financial instruments $ 6,932 $ 504