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Allowance for Loan Losses and Credit Quality - Allocation of the Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]            
Individually evaluated for impairment $ 23   $ 46      
Collectively evaluated for impairment 8,317   8,290      
Total allocated 8,340 $ 8,336 8,336 $ 8,505 $ 8,429 $ 8,271
Residential real estate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Individually evaluated for impairment 23   26      
Collectively evaluated for impairment 2,216   2,042      
Total allocated 2,239 2,224 2,068 2,082 1,996 1,776
Construction real estate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 957   837      
Total allocated 957 843 837 1,024 881 763
Commercial real estate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Individually evaluated for impairment 0   20      
Collectively evaluated for impairment 4,004   4,102      
Total allocated 4,004 3,997 4,122 4,111 4,133 4,199
Commercial            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 318   275      
Total allocated 318 289 275 425 443 458
Consumer            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 10   11      
Total allocated 10 10 11 12 13 15
Municipal            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 27   86      
Total allocated 27 88 86 81 199 214
Unallocated            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 785   937      
Total allocated $ 785 $ 885 $ 937 $ 770 $ 764 $ 846