Loans - Schedule of Loans by Status (Details) - USD ($)	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Loans held for investment, allowance for credit loss	$ 51,908,000		$ 54,695,000
Total Loans
Financing Receivable, Past Due [Line Items]
Total loans	2,217,458,000		884,390,000
Current
Financing Receivable, Past Due [Line Items]
Total loans	2,199,206,000		861,868,000
Total Delinquent Loans
Financing Receivable, Past Due [Line Items]
Total loans	18,252,000		22,522,000
30–59 Days
Financing Receivable, Past Due [Line Items]
Total loans	4,030,000		5,452,000
60–89 Days
Financing Receivable, Past Due [Line Items]
Total loans	3,743,000		4,829,000
≥ 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	10,479,000		12,241,000
Senior Secured Loans Portfolio Segment
Financing Receivable, Past Due [Line Items]
Accumulated accrued interest	1,817,000		730,000
Senior Secured Loans Portfolio Segment | Total Loans
Financing Receivable, Past Due [Line Items]
Total loans	1,744,601,000		445,733,000
Senior Secured Loans Portfolio Segment | Current
Financing Receivable, Past Due [Line Items]
Total loans	1,744,601,000		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	49,406,000	$ 49,092,000	52,385,000	$ 39,361,000	$ 37,089,000	$ 39,110,000
Accumulated accrued interest	4,485,000		5,288,000
Credit card | Credit card loans | Total Loans
Financing Receivable, Past Due [Line Items]
Total loans	319,018,000		319,694,000
Credit card | Credit card loans | Current
Financing Receivable, Past Due [Line Items]
Total loans	301,165,000		297,612,000
Credit card | Credit card loans | Total Delinquent Loans
Financing Receivable, Past Due [Line Items]
Total loans	17,853,000		22,082,000
Credit card | Credit card loans | 30–59 Days
Financing Receivable, Past Due [Line Items]
Total loans	4,030,000		5,451,000
Credit card | Credit card loans | 60–89 Days
Financing Receivable, Past Due [Line Items]
Total loans	3,666,000		4,829,000
Credit card | Credit card loans | ≥ 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	10,157,000		11,802,000
Commercial and consumer banking
Financing Receivable, Past Due [Line Items]
Total loans	152,700,000
Loans on nonaccrual status	0		0
Loans held for investment, allowance for credit loss	2,502,000	$ 2,221,000	2,310,000	$ 1,866,000	$ 1,848,000	$ 1,678,000
Accumulated accrued interest	540,000		415,000
Commercial and consumer banking | Total Loans
Financing Receivable, Past Due [Line Items]
Total loans	153,839,000		118,963,000
Commercial and consumer banking | Current
Financing Receivable, Past Due [Line Items]
Total loans	153,440,000		118,523,000
Commercial and consumer banking | Total Delinquent Loans
Financing Receivable, Past Due [Line Items]
Total loans	399,000		440,000
Commercial and consumer banking | 30–59 Days
Financing Receivable, Past Due [Line Items]
Total loans	0		1,000
Commercial and consumer banking | 60–89 Days
Financing Receivable, Past Due [Line Items]
Total loans	77,000		0
Commercial and consumer banking | ≥ 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	322,000		439,000
Commercial and consumer banking | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans	140,387,000
Commercial and consumer banking | Commercial real estate | Total Loans
Financing Receivable, Past Due [Line Items]
Total loans	140,567,000		107,757,000
Commercial and consumer banking | Commercial real estate | Current
Financing Receivable, Past Due [Line Items]
Total loans	140,567,000		107,757,000
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	4,632,000
Commercial and consumer banking | Commercial and industrial | Total Loans
Financing Receivable, Past Due [Line Items]
Total loans	5,500,000		6,548,000
Commercial and consumer banking | Commercial and industrial | Current
Financing Receivable, Past Due [Line Items]
Total loans	5,101,000		6,108,000
Commercial and consumer banking | Commercial and industrial | Total Delinquent Loans
Financing Receivable, Past Due [Line Items]
Total loans	399,000		440,000
Commercial and consumer banking | Commercial and industrial | 30–59 Days
Financing Receivable, Past Due [Line Items]
Total loans	0		1,000
Commercial and consumer banking | Commercial and industrial | 60–89 Days
Financing Receivable, Past Due [Line Items]
Total loans	77,000		0
Commercial and consumer banking | Commercial and industrial | ≥ 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	322,000		439,000
Commercial and consumer banking | Residential real estate and other consumer
Financing Receivable, Past Due [Line Items]
Total loans	7,681,000
Commercial and consumer banking | Residential real estate and other consumer | Total Loans
Financing Receivable, Past Due [Line Items]
Total loans	7,772,000		4,658,000
Commercial and consumer banking | Residential real estate and other consumer | Current
Financing Receivable, Past Due [Line Items]
Total loans	7,772,000		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