Borrowing Arrangements (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Borrowing Arrangements
Investments securing FHLB advances, amortized cost	$ 643,525	$ 669,646
Debt Securities, Available-for-sale	573,534	597,196
Letter of Credit \| Unsecured Credit Lines
Borrowing Arrangements
Line of Credit Facility, Maximum Borrowing Capacity	110,000	110,000
Letters of Credit Outstanding, Amount	0	0
Letter of Credit \| Federal Home Loan Bank Borrowings
Borrowing Arrangements
Line of Credit Facility, Maximum Borrowing Capacity	342,668	342,483
Letters of Credit Outstanding, Amount	22,000	35,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	645,760	612,702
Securities Held as Collateral, at Fair Value	533,790	500,972
Letter of Credit \| Federal Reserve Bank Term Loan Funding Program
Borrowing Arrangements
Line of Credit Facility, Maximum Borrowing Capacity	0	46,174
Letters of Credit Outstanding, Amount	45,000	45,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	47,975	53,650
Securities Held as Collateral, at Fair Value	43,858	47,603
Letter of Credit \| Federal Reserve Bank
Borrowing Arrangements
Line of Credit Facility, Maximum Borrowing Capacity	4,069	4,448
Letters of Credit Outstanding, Amount	0	0
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	4,820	4,894
Securities Held as Collateral, at Fair Value	4,230	4,374
Federal Home Loan Bank Advances
Borrowing Arrangements
Remaining borrowing capacity	342,668
Investments securing FHLB advances, amortized cost	22,385
Federal Home Loan Bank Advances \| Asset Pledged as Collateral
Borrowing Arrangements
Debt Securities	623,375
San Fransisco Branch
Borrowing Arrangements
Advances from FHLB	$ 22,000	$ 35,000

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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