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Off- Balance Sheet Activities (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet risk, allowance $ 472 $ 318
Commitment to make loans, maximum term 90 days  
Commitments to make loans    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet exposure, fixed rates $ 12,809 16,276
Off-balance sheet exposure, variable rates 13,910 20,128
Unused lines of credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet exposure, fixed rates 38,184 28,723
Off-balance sheet exposure, variable rates 344,860 288,086
Unused standby letters of credit and commercial letters of credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet exposure, fixed rates 3,440 4,895
Off-balance sheet exposure, variable rates $ 36 $ 0
Minimum    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fixed rate loan commitments, interest rate 3.50%  
Fixed rate loan commitments, maturity 2 years  
Maximum    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fixed rate loan commitments, interest rate 5.00%  
Fixed rate loan commitments, maturity 30 years