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Assets measured at fair value (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Fair Value Inputs Level 1 S A L [Member]    
Assets at fair value on a recurring basis    
U.S. Government Agency notes
Municipal bonds
U.S. Government agencies and U.S. Government-sponsored enterprises
U.S. Government agencies
Corporate bonds
Securities available-for-sale
CRA mutual funds 904 917
Derivative financial instruments
Fair Value Inputs Level 2 S A L [Member]    
Assets at fair value on a recurring basis    
U.S. Government Agency notes 19,142 7,851
Municipal bonds 28,719 27,617
U.S. Government agencies and U.S. Government-sponsored enterprises 55,722 36,573
U.S. Government agencies 14,849 17,454
Corporate bonds 8,911 8,916
Securities available-for-sale 127,343 98,411
CRA mutual funds
Derivative financial instruments 7 4
Fair Value Inputs Level 3 S A L [Member]    
Assets at fair value on a recurring basis    
U.S. Government Agency notes
Municipal bonds
U.S. Government agencies and U.S. Government-sponsored enterprises
U.S. Government agencies
Corporate bonds
Securities available-for-sale
CRA mutual funds
Derivative financial instruments
Fair Value Inputs Level 12 And 3 S A L [Member]    
Assets at fair value on a recurring basis    
U.S. Government Agency notes 19,142 7,851
Municipal bonds 28,719 27,617
U.S. Government agencies and U.S. Government-sponsored enterprises 55,722 36,573
U.S. Government agencies 14,849 17,454
Corporate bonds 8,911 8,916
Securities available-for-sale 127,343 98,411
CRA mutual funds 904 917
Derivative financial instruments $ 7 $ 4