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Loans and Allowance for Loan Losses - Outstanding principal balance and related carrying amount of acquired loans (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Loans and Allowance for Loan Losses      
Carrying amount $ 18,911 $ 20,719 $ 7,299
Changes in the accretable yield on purchased credit impaired loans      
Balance at the beginning of the period 216 371  
Accretion (40) (878)  
Reclassification of nonaccretable difference due to improvement in expected cash flows 23 691  
Other changes, net 17 32  
Balance at the end of the period 216 216  
Purchased credit impaired      
Loans and Allowance for Loan Losses      
Outstanding principal balance 3,828 4,010  
Carrying amount 2,955 3,064  
Other acquired loans      
Loans and Allowance for Loan Losses      
Outstanding principal balance 59,819 65,656  
Carrying amount 59,103 64,819  
Acquired Loan Portfolio      
Loans and Allowance for Loan Losses      
Outstanding principal balance 63,647 69,666  
Carrying amount $ 62,058 $ 67,883