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Loans - Schedule of Loans by Status (Details) - USD ($)
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Financing Receivable, Past Due [Line Items]        
Financing receivable, allowance for credit loss $ 38,937,000 $ 40,788,000    
Total Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 362,089,000 344,106,000    
Financial Asset, Not Past Due [Member]        
Financing Receivable, Past Due [Line Items]        
Total loans 343,316,000 325,311,000    
30–59 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 4,271,000 4,670,000    
60–89 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 3,669,000 3,627,000    
≥ 90 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 10,833,000 10,498,000    
Total Delinquent Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 18,773,000 18,795,000    
Credit card | Credit card loans        
Financing Receivable, Past Due [Line Items]        
Financing receivable, allowance for credit loss 37,089,000 39,110,000 $ 16,500,000 $ 7,037,000
Accumulated accrued interest 4,514,000 4,315,000    
Loans on nonaccrual status 0 0    
Credit card | Credit card loans | Total Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 249,489,000 243,959,000    
Credit card | Credit card loans | Financial Asset, Not Past Due [Member]        
Financing Receivable, Past Due [Line Items]        
Total loans 231,057,000 225,165,000    
Credit card | Credit card loans | 30–59 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 4,267,000 4,670,000    
Credit card | Credit card loans | 60–89 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 3,332,000 3,626,000    
Credit card | Credit card loans | ≥ 90 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 10,833,000 10,498,000    
Credit card | Credit card loans | Total Delinquent Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 18,432,000 18,794,000    
Commercial and consumer banking        
Financing Receivable, Past Due [Line Items]        
Total loans 112,099,000      
Financing receivable, allowance for credit loss 1,848,000 1,678,000 $ 1,366,000 $ 0
Accumulated accrued interest 363,000 324,000    
Commercial and consumer banking | Total Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 112,600,000 100,147,000    
Commercial and consumer banking | Financial Asset, Not Past Due [Member]        
Financing Receivable, Past Due [Line Items]        
Total loans 112,259,000 100,146,000    
Commercial and consumer banking | 30–59 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 4,000 0    
Commercial and consumer banking | 60–89 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 337,000 1,000    
Commercial and consumer banking | ≥ 90 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 0 0    
Commercial and consumer banking | Total Delinquent Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 341,000 1,000    
Commercial and consumer banking | Commercial real estate        
Financing Receivable, Past Due [Line Items]        
Total loans 102,194,000      
Commercial and consumer banking | Commercial real estate | Total Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 102,390,000 89,544,000    
Commercial and consumer banking | Commercial real estate | Financial Asset, Not Past Due [Member]        
Financing Receivable, Past Due [Line Items]        
Total loans 102,390,000 89,544,000    
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 real estate | Total Delinquent Loans        
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 6,970,000      
Commercial and consumer banking | Commercial and industrial | Total Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 7,209,000 7,637,000    
Commercial and consumer banking | Commercial and industrial | Financial Asset, Not Past Due [Member]        
Financing Receivable, Past Due [Line Items]        
Total loans 6,868,000 7,636,000    
Commercial and consumer banking | Commercial and industrial | 30–59 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 4,000 0    
Commercial and consumer banking | Commercial and industrial | 60–89 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 337,000 1,000    
Commercial and consumer banking | Commercial and industrial | ≥ 90 Days        
Financing Receivable, Past Due [Line Items]        
Total loans 0 0    
Commercial and consumer banking | Commercial and industrial | Total Delinquent Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 341,000 1,000    
Commercial and consumer banking | Residential real estate and other consumer        
Financing Receivable, Past Due [Line Items]        
Total loans 2,935,000      
Commercial and consumer banking | Residential real estate and other consumer | Total Loans        
Financing Receivable, Past Due [Line Items]        
Total loans 3,001,000 2,966,000    
Commercial and consumer banking | Residential real estate and other consumer | Financial Asset, Not Past Due [Member]        
Financing Receivable, Past Due [Line Items]        
Total loans 3,001,000 2,966,000    
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    
Commercial and consumer banking | Residential real estate and other consumer | Total Delinquent Loans        
Financing Receivable, Past Due [Line Items]        
Total loans $ 0 $ 0