Investment Securities - Summary of Amortized Cost, Unrealized Gains and Losses, Allowances for Credit Losses and Fair Value of Available-for-Sale Investments Aggregated by Maturity and Security Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Amortized Cost	$ 260,536	$ 307,243
Debt securities, Unrealized Gains	498	13
Debt securities, Unrealized Losses	(436)	(3,369)
Debt securities, Estimated Fair Value	$ 260,598	$ 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	$ 10,488	$ 4,092
Debt securities, Unrealized Gains	2
Debt securities, Unrealized Losses	(23)	(57)
Debt securities, Estimated Fair Value	$ 10,467	$ 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	$ 3,862	$ 3,920
Debt securities, Unrealized Gains	12	7
Debt securities, Unrealized Losses	(5)	(33)
Debt securities, Estimated Fair Value	$ 3,869	$ 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	$ 162,746	$ 200,938
Debt securities, Unrealized Gains	70	4
Debt securities, Unrealized Losses	(349)	(2,182)
Debt securities, Estimated Fair Value	$ 162,467	$ 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	$ 58,441	$ 68,130
Debt securities, Unrealized Gains	412	2
Debt securities, Unrealized Losses	(16)	(926)
Debt securities, Estimated Fair Value	$ 58,837	$ 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	$ 12,499	$ 22,663
Debt securities, Unrealized Losses	(29)	(84)
Debt securities, Estimated Fair Value	$ 12,470	$ 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	$ 12,500	$ 7,500
Debt securities, Unrealized Gains	2
Debt securities, Unrealized Losses	(14)	(87)
Debt securities, Estimated Fair Value	$ 12,488	$ 7,413