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Fair Value Measurements - Financial assets and liabilities measured at fair value on a recurring basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Assets    
Securities available-for-sale $ 135,104 $ 126,151 [1]
Level 2    
Assets    
Securities available-for-sale 135,104 126,151
Recurring    
Assets    
Securities available-for-sale 135,104 126,151
Recurring | Securities of state and local municipalities tax exempt    
Assets    
Securities available-for-sale 2,466 3,493
Recurring | Securities of state and local municipalities taxable    
Assets    
Securities available-for-sale 754 818
Recurring | Corporate bonds    
Assets    
Securities available-for-sale 14,062 12,817
Recurring | SBA pass-through securities    
Assets    
Securities available-for-sale 122 141
Recurring | Mortgage-backed securities    
Assets    
Securities available-for-sale 96,254 83,714
Recurring | Collateralized mortgage obligations    
Assets    
Securities available-for-sale 21,446 25,168
Recurring | Level 2    
Assets    
Securities available-for-sale 135,104 126,151
Recurring | Level 2 | Securities of state and local municipalities tax exempt    
Assets    
Securities available-for-sale 2,466 3,493
Recurring | Level 2 | Securities of state and local municipalities taxable    
Assets    
Securities available-for-sale 754 818
Recurring | Level 2 | Corporate bonds    
Assets    
Securities available-for-sale 14,062 12,817
Recurring | Level 2 | SBA pass-through securities    
Assets    
Securities available-for-sale 122 141
Recurring | Level 2 | Mortgage-backed securities    
Assets    
Securities available-for-sale 96,254 83,714
Recurring | Level 2 | Collateralized mortgage obligations    
Assets    
Securities available-for-sale $ 21,446 $ 25,168
[1] Derived from audited consolidated financial statements.