Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Jan. 01, 2023
Summary of Significant Accounting Policies
Accrued interest receivable on available-for-sale debt securities	$ 2,400	$ 2,700
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Interest Receivable	Interest Receivable
Accrued interest receivable on loans receivable	$ 1,400	$ 1,400
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Interest Receivable	Interest Receivable
Amount of loans evaluated for determination of allowance for credit losses	$ 100,000
Retained earnings	44,073	$ 44,018
Loans, net of allowance	$ 476,437	$ 479,318
Cumulative effect of adoption of ASU 2016-13 | ASU No. 2016-13
Summary of Significant Accounting Policies
Retained earnings			$ 2,088,000
Cumulative effect of adoption of ASU 2016-13 | ASU No. 2016-13 | Loans other than unfunded loan commitments
Summary of Significant Accounting Policies
Loans, net of allowance			1,911,000
Cumulative effect of adoption of ASU 2016-13 | ASU No. 2016-13 | Unfunded loan commitments
Summary of Significant Accounting Policies
Loans, net of allowance			$ 177,000