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Off-Balance Sheet Financial Instruments and Guarantees (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Loss Contingencies [Line Items]    
Financial instrument commitments $ 221,911 $ 104,754
Commitments to grant loans [Member]    
Loss Contingencies [Line Items]    
Financial instrument commitments 78,310 44,246
Unfunded commitments under lines of credit [Member]    
Loss Contingencies [Line Items]    
Financial instrument commitments 137,965 56,840
Standby letters of credit [Member]    
Loss Contingencies [Line Items]    
Financial instrument commitments $ 5,636 $ 3,668