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Guarantees, Commitments and Contingencies - Summary of Commitment and Contingent Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Standby Letters of Credit [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Commitments and contingent liabilities $ 180 $ 180
Standby Performance Letters of Credit [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Commitments and contingent liabilities 555 647
Commitments to Extend Credit [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Commitments and contingent liabilities $ 109,630 $ 96,967