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Loans and Allowance for Loan Losses - Schedule of Activity in Allowance for Loan Losses by Portfolio Segment (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
Analysis of allowance for loan losses                      
Beginning balance       $ 15,352,000       $ 10,050,000 $ 15,352,000 $ 10,050,000 $ 9,636,000
Provision for (reversal of) loan losses                 959,000 5,318,000 1,102,000
Charge-offs                 (195,000) (45,000) (689,000)
Recoveries                 7,000 29,000 1,000
Ending balance $ 16,123,000       $ 15,352,000       16,123,000 15,352,000 10,050,000
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
Uncollectible Accrued Interest Receivable                      
Analysis of allowance for loan losses                      
Provision for loan losses                 205,000 643,000 0
Commercial real estate                      
Analysis of allowance for loan losses                      
Beginning balance       8,505,000       6,000,000 8,505,000 6,000,000 4,805,000
Provision for (reversal of) loan losses                 (355,000) 2,505,000 1,195,000
Charge-offs                 0 0 0
Recoveries                 0 0 0
Ending balance 8,150,000       8,505,000       8,150,000 8,505,000 6,000,000
SBA loans—real estate                      
Analysis of allowance for loan losses                      
Beginning balance       1,802,000       939,000 1,802,000 939,000 894,000
Provision for (reversal of) loan losses                 279,000 863,000 734,000
Charge-offs                 (59,000) 0 (689,000)
Recoveries                 0 0 0
Ending balance 2,022,000       1,802,000       2,022,000 1,802,000 939,000
SBA loans—non-real estate                      
Analysis of allowance for loan losses                      
Beginning balance       278,000       121,000 278,000 121,000 505,000
Provision for (reversal of) loan losses                 54,000 174,000 (384,000)
Charge-offs                 (136,000) (45,000) 0
Recoveries                 3,000 28,000 0
Ending balance 199,000       278,000       199,000 278,000 121,000
Commercial and industrial ("C&I")                      
Analysis of allowance for loan losses                      
Beginning balance       2,563,000       1,289,000 2,563,000 1,289,000 1,746,000
Provision for (reversal of) loan losses                 285,000 1,274,000 (457,000)
Charge-offs                 0 0 0
Recoveries                 0 0 0
Ending balance 2,848,000       2,563,000       2,848,000 2,563,000 1,289,000
Home mortgage                      
Analysis of allowance for loan losses                      
Beginning balance       2,185,000       1,667,000 2,185,000 1,667,000 1,653,000
Provision for (reversal of) loan losses                 706,000 518,000 14,000
Charge-offs                 0 0 0
Recoveries                 0 0 0
Ending balance 2,891,000       2,185,000       2,891,000 2,185,000 1,667,000
Consumer                      
Analysis of allowance for loan losses                      
Beginning balance       $ 19,000       $ 34,000 19,000 34,000 33,000
Provision for (reversal of) loan losses                 (10,000) (16,000) 0
Charge-offs                 0 0 0
Recoveries                 4,000 1,000 1,000
Ending balance $ 13,000       $ 19,000       $ 13,000 $ 19,000 $ 34,000