Investment Securities - Summary of Cost, Gross Unrealized Holding Gains and Losses, Allowances for Credit Losses and Fair Value of Available-for-Sale Investments by Types, Maturities and Classes of Securities (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2023	Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Amortized Cost	$ 277,891	$ 307,243
Debt securities, Unrealized Gains	5	13
Debt securities, Unrealized Losses	(2,005)	(3,369)
Debt securities, Estimated Fair Value	$ 275,891	$ 303,887
Certificates of Deposit \| Within 1 Year
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Maturity	Within 1 year	Within 1 year
Debt securities, Amortized Cost	$ 8,805	$ 4,092
Debt securities, Unrealized Losses	(53)	(57)
Debt securities, Estimated Fair Value	$ 8,752	$ 4,035
Certificates of Deposit \| 1 Year to 2 Years
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Maturity	1 year to 2 years	1 year to 2 years
Debt securities, Amortized Cost	$ 4,607	$ 3,920
Debt securities, Unrealized Gains		7
Debt securities, Unrealized Losses	(40)	(33)
Debt securities, Estimated Fair Value	$ 4,567	$ 3,894
U.S. Treasury Securities \| Within 1 Year
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Maturity	Within 1 year	Within 1 year
Debt securities, Amortized Cost	$ 205,454	$ 200,938
Debt securities, Unrealized Gains	5	4
Debt securities, Unrealized Losses	(1,494)	(2,182)
Debt securities, Estimated Fair Value	$ 203,965	$ 198,760
U.S. Treasury Securities \| 1 Year to 2 Years
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Maturity	1 year to 2 years	1 year to 2 years
Debt securities, Amortized Cost	$ 31,361	$ 68,130
Debt securities, Unrealized Gains		2
Debt securities, Unrealized Losses	(249)	(926)
Debt securities, Estimated Fair Value	$ 31,112	$ 67,206
U.S. Government agency securities \| Within 1 Year
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Maturity	Within 1 year	Within 1 year
Debt securities, Amortized Cost	$ 22,664	$ 22,663
Debt securities, Unrealized Losses	(114)	(84)
Debt securities, Estimated Fair Value	$ 22,550	$ 22,579
U.S. Government agency securities \| 1 Year to 2 Years
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Maturity	1 year to 2 years	1 year to 2 years
Debt securities, Amortized Cost	$ 5,000	$ 7,500
Debt securities, Unrealized Losses	(55)	(87)
Debt securities, Estimated Fair Value	$ 4,945	$ 7,413

Investment Securities - Summary of Cost, Gross Unrealized Holding Gains and Losses, Allowances for Credit Losses and Fair Value of Available-for-Sale Investments by Types, Maturities and Classes of Securities (Details) - USD ($)
$ in Thousands

6 Months Ended

12 Months Ended

Jun. 30, 2023

Dec. 31, 2022

Schedule Of Available For Sale Securities [Line Items]

Debt securities, Amortized Cost

$ 277,891

$ 307,243

Debt securities, Unrealized Gains

Debt securities, Unrealized Losses

(2,005)

(3,369)