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Off-Balance-Sheet Activities (Contractual amount of credit related financial instruments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contract Amount $ 274,540 $ 228,224
Maximum maturity period of commitments to extend credit 1 year  
Unfunded commitments under lines of credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contract Amount $ 241,637 202,871
Commercial and standby letters of credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contract Amount 5,964 4,575
Commitments to grant loans [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contract Amount $ 26,939 $ 20,778