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Guarantees, Commitments and Contingencies - Summary of Commitment and Contingent Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Standby Letters of Credit [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Commitments and contingent liabilities   $ 180
Standby Performance Letters of Credit [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Commitments and contingent liabilities $ 580 580
Commitments to Extend Credit [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Commitments and contingent liabilities $ 139,842 $ 118,699