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Loans - Schedule of Loans by Status (Details) - USD ($)
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Financing Receivable, Past Due [Line Items]        
Loans held for investment, allowance for credit loss $ 51,313,000 $ 54,695,000    
Total Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 1,294,721,000 884,390,000    
Current        
Financing Receivable, Past Due [Line Items]        
Total loans 1,273,034,000 861,868,000    
Total Delinquent Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 21,687,000 22,522,000    
30–59 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 4,858,000 5,452,000    
60–89 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 4,518,000 4,829,000    
≥ 90 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 12,311,000 12,241,000    
Senior Secured Loans Portfolio Segment        
Financing Receivable, Past Due [Line Items]        
Accumulated accrued interest 1,292,000 730,000    
Senior Secured Loans Portfolio Segment | Total Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 844,502,000 445,733,000    
Senior Secured Loans Portfolio Segment | Current        
Financing Receivable, Past Due [Line Items]        
Total loans 844,502,000 445,733,000    
Senior Secured Loans Portfolio Segment | Total Delinquent Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 0 0    
Senior Secured Loans Portfolio Segment | 30–59 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 0 0    
Senior Secured Loans Portfolio Segment | 60–89 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 0 0    
Senior Secured Loans Portfolio Segment | ≥ 90 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 0 0    
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 49,092,000 52,385,000 $ 37,089,000 $ 39,110,000
Accumulated accrued interest 4,937,000 5,288,000    
Credit card | Credit card loans | Total Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 316,971,000 319,694,000    
Credit card | Credit card loans | Current        
Financing Receivable, Past Due [Line Items]        
Total loans 296,182,000 297,612,000    
Credit card | Credit card loans | Total Delinquent Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 20,789,000 22,082,000    
Credit card | Credit card loans | 30–59 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 4,637,000 5,451,000    
Credit card | Credit card loans | 60–89 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 4,274,000 4,829,000    
Credit card | Credit card loans | ≥ 90 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 11,878,000 11,802,000    
Commercial and consumer banking        
Financing Receivable, Past Due [Line Items]        
Total loans 132,302,000      
Loans held for investment, allowance for credit loss 2,221,000 2,310,000 $ 1,848,000 $ 1,678,000
Accumulated accrued interest 479,000 415,000    
Commercial and consumer banking | Total Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 133,248,000 118,963,000    
Commercial and consumer banking | Current        
Financing Receivable, Past Due [Line Items]        
Total loans 132,350,000 118,523,000    
Commercial and consumer banking | Total Delinquent Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 898,000 440,000    
Commercial and consumer banking | 30–59 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 221,000 1,000    
Commercial and consumer banking | 60–89 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 244,000 0    
Commercial and consumer banking | ≥ 90 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 433,000 439,000    
Commercial and consumer banking | Commercial real estate        
Financing Receivable, Past Due [Line Items]        
Total loans 123,896,000      
Commercial and consumer banking | Commercial real estate | Total Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 124,079,000 107,757,000    
Commercial and consumer banking | Commercial real estate | Current        
Financing Receivable, Past Due [Line Items]        
Total loans 123,945,000 107,757,000    
Commercial and consumer banking | Commercial real estate | Total Delinquent Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 134,000 0    
Commercial and consumer banking | Commercial real estate | 30–59 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 134,000 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 5,256,000      
Commercial and consumer banking | Commercial and industrial | Total Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 5,786,000 6,548,000    
Commercial and consumer banking | Commercial and industrial | Current        
Financing Receivable, Past Due [Line Items]        
Total loans 5,022,000 6,108,000    
Commercial and consumer banking | Commercial and industrial | Total Delinquent Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 764,000 440,000    
Commercial and consumer banking | Commercial and industrial | 30–59 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 87,000 1,000    
Commercial and consumer banking | Commercial and industrial | 60–89 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 244,000 0    
Commercial and consumer banking | Commercial and industrial | ≥ 90 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 433,000 439,000    
Commercial and consumer banking | Residential real estate and other consumer        
Financing Receivable, Past Due [Line Items]        
Total loans 3,150,000      
Commercial and consumer banking | Residential real estate and other consumer | Total Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 3,383,000 4,658,000    
Commercial and consumer banking | Residential real estate and other consumer | Current        
Financing Receivable, Past Due [Line Items]        
Total loans 3,383,000 4,658,000    
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