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Loans and Allowance for Loan Losses - Additional Information (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Loan
Borrower
Jun. 30, 2021
USD ($)
Loan
Borrower
Jun. 30, 2021
USD ($)
Loan
Borrower
Jun. 30, 2021
USD ($)
Loan
Borrower
Jun. 30, 2021
USD ($)
Loan
Borrower
Contract
Jun. 30, 2021
USD ($)
Loan
Borrower
DebtSecurityNumber
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Loan
Dec. 31, 2020
USD ($)
Contract
Dec. 31, 2020
USD ($)
DebtSecurityNumber
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]                          
Loans Pledged as Collateral $ 58,600 $ 58,600 $ 58,600 $ 58,600 $ 58,600 $ 58,600 $ 36,100 $ 36,100 $ 36,100 $ 36,100 $ 36,100    
Loans and Leases Receivable, Related Parties, Ending Balance   300         400            
Loans and Leases Receivable, Related Parties, Additions   0         0            
Loans and Leases Receivable, Related Parties, Proceeds   100         500            
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest 1,300 1,300 1,300 1,300 1,300 1,300 3,100 3,100 3,100 3,100 3,100    
Financing Receivable, Troubled Debt Restructuring             100 100 100 100 100 $ 100  
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans   39         161            
Interest Income Recorded 17 17 17 $ 17 17 $ 17 42 42 $ 42 42 $ 42    
Number of loans       2   7     0   5    
Financing Receivable, Restructuring Recorded Investment With Nonaccrual Status 6,500 6,500 6,500 $ 6,500 6,500 $ 6,500              
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition 0 0 0 0 $ 0 0 0 0 $ 0 $ 0 $ 0    
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Contract         0         0      
Loans, allowance for loan losses 7,726 7,726 7,726 7,726 $ 7,726 7,726 7,470 7,470 7,470 $ 7,470 7,470 6,423 $ 5,762
Restructured Loan Modified through Extended Maturity and Payment Schedule Modification [Member]                          
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]                          
Financing Receivable, Restructuring Recorded Investment With Nonaccrual Status 500 500 500 500 500 500              
Loans, allowance for loan losses $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 1 1 1 1 1    
Minimum [Member]                          
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]                          
Loans Modified in a Troubled Debt Restructuring, Individually Evaluated for Impairment, Principal Balance, Threshold                       500  
Minimum [Member] | ALC [Member]                          
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]                          
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest                       $ 50  
Paycheck Protection Program [Member]                          
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]                          
Loan, fixed interest rate 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Loan, aggregate principal balance $ 11,600 $ 11,600 $ 11,600 $ 11,600 $ 11,600 $ 11,600              
Number of loans to small businesses | Loan 151 151 151 151 151 151              
Number of companies | Borrower 120 120 120 120 120 120              
Amortized loan fees   $ 242         161            
Net deferred loan fee   $ 344                      
Paycheck Protection Program [Member] | Minimum [Member]                          
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]                          
Loan fee percentage 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%              
Paycheck Protection Program [Member] | Maximum [Member]                          
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]                          
Loan fee percentage 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%              
Paycheck Protection Program [Member] | Two Year Term Loan [Member]                          
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]                          
Loan, aggregate principal balance $ 5,800 $ 5,800 $ 5,800 $ 5,800 $ 5,800 $ 5,800              
Loan payment term two-year                        
Paycheck Protection Program [Member] | Five Year Term Loan [Member]                          
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]                          
Loan, aggregate principal balance $ 5,800 5,800 5,800 5,800 5,800 5,800              
Loan payment term five-year                        
Financial Asset Acquired With Credit Deterioration [Member]                          
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]                          
Amount Of Deferment Loan $ 600 600 $ 600 $ 600 $ 600 $ 600 8,100 $ 8,100 $ 8,100 $ 8,100 $ 8,100    
Deferred principal balance of loan reduced   $ 12,000         $ 13,500            
Deferred principal balance of loan reduced percentage     1.70%         2.10%          
Real Estate [Member]                          
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]                          
Percentage of Loan Portfolio 54.70% 54.70% 54.70% 54.70% 54.70% 54.70% 56.10% 56.10% 56.10% 56.10% 56.10%