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Loans - Schedule of Loans by Status (Details) - USD ($)
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Financing Receivable, Past Due [Line Items]            
Loans held for investment, allowance for credit loss $ 51,923,000   $ 40,788,000      
Total loans held for investment, at amortized cost 361,248,000   307,957,000      
Total Loans            
Financing Receivable, Past Due [Line Items]            
Total loans 407,693,000   344,106,000      
Current            
Financing Receivable, Past Due [Line Items]            
Total loans 386,562,000   325,311,000      
Total Delinquent Loans            
Financing Receivable, Past Due [Line Items]            
Total loans 21,131,000   18,795,000      
30–59 Days            
Financing Receivable, Past Due [Line Items]            
Total loans 5,293,000   4,670,000      
60–89 Days            
Financing Receivable, Past Due [Line Items]            
Total loans 4,078,000   3,627,000      
≥ 90 Days            
Financing Receivable, Past Due [Line Items]            
Total loans 11,760,000   10,498,000      
Credit card | Credit card loans            
Financing Receivable, Past Due [Line Items]            
Loans on nonaccrual status 0   0      
Loans held for investment, allowance for credit loss 50,055,000 $ 39,361,000 39,110,000 $ 32,960,000 $ 21,974,000 $ 7,037,000
Accumulated accrued interest 5,092,000   4,315,000      
Total loans held for investment, at amortized cost 247,241,000   209,164,000      
Credit card | Credit card loans | Total Loans            
Financing Receivable, Past Due [Line Items]            
Total loans 292,204,000   243,959,000      
Credit card | Credit card loans | Current            
Financing Receivable, Past Due [Line Items]            
Total loans 271,827,000   225,165,000      
Credit card | Credit card loans | Total Delinquent Loans            
Financing Receivable, Past Due [Line Items]            
Total loans 20,377,000   18,794,000      
Credit card | Credit card loans | 30–59 Days            
Financing Receivable, Past Due [Line Items]            
Total loans 5,005,000   4,670,000      
Credit card | Credit card loans | 60–89 Days            
Financing Receivable, Past Due [Line Items]            
Total loans 4,078,000   3,626,000      
Credit card | Credit card loans | ≥ 90 Days            
Financing Receivable, Past Due [Line Items]            
Total loans 11,294,000   10,498,000      
Commercial and consumer banking            
Financing Receivable, Past Due [Line Items]            
Total loans 115,162,000          
Loans held for investment, allowance for credit loss 1,868,000 $ 1,866,000 1,678,000 $ 1,410,000 $ 1,204,000 $ 0
Accumulated accrued interest 386,000   324,000      
Total loans held for investment, at amortized cost 114,007,000   98,793,000      
Revolving Loans 327,000          
Commercial and consumer banking | Total Loans            
Financing Receivable, Past Due [Line Items]            
Total loans 115,489,000   100,147,000      
Commercial and consumer banking | Current            
Financing Receivable, Past Due [Line Items]            
Total loans 114,735,000   100,146,000      
Commercial and consumer banking | Total Delinquent Loans            
Financing Receivable, Past Due [Line Items]            
Total loans 754,000   1,000      
Commercial and consumer banking | 30–59 Days            
Financing Receivable, Past Due [Line Items]            
Total loans 288,000   0      
Commercial and consumer banking | 60–89 Days            
Financing Receivable, Past Due [Line Items]            
Total loans 0   1,000      
Commercial and consumer banking | ≥ 90 Days            
Financing Receivable, Past Due [Line Items]            
Total loans 466,000   0      
Commercial and consumer banking | Commercial real estate            
Financing Receivable, Past Due [Line Items]            
Total loans 105,519,000          
Total loans held for investment, at amortized cost 104,743,000   88,652,000      
Revolving Loans 190,000          
Commercial and consumer banking | Commercial real estate | Total Loans            
Financing Receivable, Past Due [Line Items]            
Total loans 105,709,000   89,544,000      
Commercial and consumer banking | Commercial real estate | Current            
Financing Receivable, Past Due [Line Items]            
Total loans 105,709,000   89,544,000      
Commercial and consumer banking | Commercial real estate | Total Delinquent Loans            
Financing Receivable, Past Due [Line Items]            
Total loans 0   0      
Commercial and consumer banking | Commercial real estate | 30–59 Days            
Financing Receivable, Past Due [Line Items]            
Total loans 0   0      
Commercial and consumer banking | Commercial real estate | 60–89 Days            
Financing Receivable, Past Due [Line Items]            
Total loans 0   0      
Commercial and consumer banking | Commercial real estate | ≥ 90 Days            
Financing Receivable, Past Due [Line Items]            
Total loans 0   0      
Commercial and consumer banking | Commercial and industrial            
Financing Receivable, Past Due [Line Items]            
Total loans 6,388,000          
Total loans held for investment, at amortized cost 5,917,000   7,179,000      
Revolving Loans 50,000          
Commercial and consumer banking | Commercial and industrial | Total Loans            
Financing Receivable, Past Due [Line Items]            
Total loans 6,438,000   7,637,000      
Commercial and consumer banking | Commercial and industrial | Current            
Financing Receivable, Past Due [Line Items]            
Total loans 5,684,000   7,636,000      
Commercial and consumer banking | Commercial and industrial | Total Delinquent Loans            
Financing Receivable, Past Due [Line Items]            
Total loans 754,000   1,000      
Commercial and consumer banking | Commercial and industrial | 30–59 Days            
Financing Receivable, Past Due [Line Items]            
Total loans 288,000   0      
Commercial and consumer banking | Commercial and industrial | 60–89 Days            
Financing Receivable, Past Due [Line Items]            
Total loans 0   1,000      
Commercial and consumer banking | Commercial and industrial | ≥ 90 Days            
Financing Receivable, Past Due [Line Items]            
Total loans 466,000   0      
Commercial and consumer banking | Residential real estate and other consumer            
Financing Receivable, Past Due [Line Items]            
Total loans 3,255,000          
Total loans held for investment, at amortized cost 3,347,000   2,962,000      
Revolving Loans 87,000          
Commercial and consumer banking | Residential real estate and other consumer | Total Loans            
Financing Receivable, Past Due [Line Items]            
Total loans 3,342,000   2,966,000      
Commercial and consumer banking | Residential real estate and other consumer | Current            
Financing Receivable, Past Due [Line Items]            
Total loans 3,342,000   2,966,000      
Commercial and consumer banking | Residential real estate and other consumer | Total Delinquent Loans            
Financing Receivable, Past Due [Line Items]            
Total loans 0   0      
Commercial and consumer banking | Residential real estate and other consumer | 30–59 Days            
Financing Receivable, Past Due [Line Items]            
Total loans 0   0      
Commercial and consumer banking | Residential real estate and other consumer | 60–89 Days            
Financing Receivable, Past Due [Line Items]            
Total loans 0   0      
Commercial and consumer banking | Residential real estate and other consumer | ≥ 90 Days            
Financing Receivable, Past Due [Line Items]            
Total loans $ 0   $ 0