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Loans and Allowance for Loan Losses - Schedule of Allowance for Loan Losses and Recorded Investment by Portfolio Segment and Impairment Methodology (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable Allowance For Credit Losses [Line Items]                        
Allowance for Loans Individually Evaluated for Impairment $ 312,000       $ 417,000       $ 312,000 $ 417,000    
Allowance for Loan Collectively Evaluated for Impairment 15,811,000       14,935,000       15,811,000 14,935,000    
Allowance for loan losses, Total 16,123,000       15,352,000       16,123,000 15,352,000 $ 10,050,000 $ 9,636,000
Loans Individually Evaluated for Impairment 1,124,000       504,000       1,124,000 504,000    
Loans Collectively Evaluated for Impairment 1,312,895,000       1,099,232,000       1,312,895,000 1,099,232,000    
Loans, Total 1,314,019,000       1,099,736,000       1,314,019,000 1,099,736,000    
Provision for loan losses 1,898,000 $ (884,000) $ (1,112,000) $ 620,000 1,831,000 $ 1,399,000 $ 1,988,000 $ 743,000 522,000 5,961,000 1,102,000  
Accrued interest receivable 4,400,000       4,400,000       4,400,000 4,400,000    
Uncollectible Accrued Interest Receivable                        
Financing Receivable Allowance For Credit Losses [Line Items]                        
Provision for loan losses                 205,000 643,000 0  
Commercial real estate                        
Financing Receivable Allowance For Credit Losses [Line Items]                        
Allowance for Loans Individually Evaluated for Impairment 0       0       0 0    
Allowance for Loan Collectively Evaluated for Impairment 8,150,000       8,505,000       8,150,000 8,505,000    
Allowance for loan losses, Total 8,150,000       8,505,000       8,150,000 8,505,000 6,000,000 4,805,000
Loans Individually Evaluated for Impairment 0       0       0 0    
Loans Collectively Evaluated for Impairment 701,450,000       651,684,000       701,450,000 651,684,000    
Loans, Total 701,450,000       651,684,000       701,450,000 651,684,000    
SBA loans—real estate                        
Financing Receivable Allowance For Credit Losses [Line Items]                        
Allowance for Loans Individually Evaluated for Impairment 0       0       0 0    
Allowance for Loan Collectively Evaluated for Impairment 2,022,000       1,802,000       2,022,000 1,802,000    
Allowance for loan losses, Total 2,022,000       1,802,000       2,022,000 1,802,000 939,000 894,000
Loans Individually Evaluated for Impairment 812,000       0       812,000 0    
Loans Collectively Evaluated for Impairment 219,287,000       136,224,000       219,287,000 136,224,000    
Loans, Total 220,099,000       136,224,000       220,099,000 136,224,000    
SBA loans—non-real estate                        
Financing Receivable Allowance For Credit Losses [Line Items]                        
Allowance for Loans Individually Evaluated for Impairment 0       87,000       0 87,000    
Allowance for Loan Collectively Evaluated for Impairment 199,000       191,000       199,000 191,000    
Allowance for loan losses, Total 199,000       278,000       199,000 278,000 121,000 505,000
Loans Individually Evaluated for Impairment 0       174,000       0 174,000    
Loans Collectively Evaluated for Impairment 55,759,000       74,977,000       55,759,000 74,977,000    
Loans, Total 55,759,000       75,151,000       55,759,000 75,151,000    
Commercial and industrial ("C&I")                        
Financing Receivable Allowance For Credit Losses [Line Items]                        
Allowance for Loans Individually Evaluated for Impairment 312,000       330,000       312,000 330,000    
Allowance for Loan Collectively Evaluated for Impairment 2,536,000       2,233,000       2,536,000 2,233,000    
Allowance for loan losses, Total 2,848,000       2,563,000       2,848,000 2,563,000 1,289,000 1,746,000
Loans Individually Evaluated for Impairment 312,000       330,000       312,000 330,000    
Loans Collectively Evaluated for Impairment 162,231,000       106,977,000       162,231,000 106,977,000    
Loans, Total 162,543,000       107,307,000       162,543,000 107,307,000    
Home mortgage                        
Financing Receivable Allowance For Credit Losses [Line Items]                        
Allowance for Loans Individually Evaluated for Impairment 0       0       0 0    
Allowance for Loan Collectively Evaluated for Impairment 2,891,000       2,185,000       2,891,000 2,185,000    
Allowance for loan losses, Total 2,891,000       2,185,000       2,891,000 2,185,000 1,667,000 1,653,000
Loans Individually Evaluated for Impairment 0       0       0 0    
Loans Collectively Evaluated for Impairment 173,303,000       128,212,000       173,303,000 128,212,000    
Loans, Total 173,303,000       128,212,000       173,303,000 128,212,000    
Consumer                        
Financing Receivable Allowance For Credit Losses [Line Items]                        
Allowance for Loans Individually Evaluated for Impairment 0       0       0 0    
Allowance for Loan Collectively Evaluated for Impairment 13,000       19,000       13,000 19,000    
Allowance for loan losses, Total 13,000       19,000       13,000 19,000 $ 34,000 $ 33,000
Loans Individually Evaluated for Impairment 0       0       0 0    
Loans Collectively Evaluated for Impairment 865,000       1,158,000       865,000 1,158,000    
Loans, Total $ 865,000       $ 1,158,000       $ 865,000 $ 1,158,000