Borrowing Arrangements - Textual (Details) - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Borrowing Arrangements
Total loans	$ 2,510,786,000	$ 2,308,418,000
Investment securities, fair value	469,410,000	477,113,000
Borrowings	73,000,000	133,442,000
Federal Home Loan Bank Advances
Borrowing Arrangements
Short-Term Debt		45,000,000
Unsecured Credit Lines
Borrowing Arrangements
Maximum borrowing capacity on lines of credit	110,000,000	110,000,000
Borrowings	0	0
Federal Reserve Bank
Borrowing Arrangements
Maximum borrowing capacity on lines of credit	3,411,000	3,669,000
Borrowings	0	0
Asset Pledged as Collateral \| Federal Reserve Bank
Borrowing Arrangements
Investment securities, amortized cost	3,910,000	4,406,000
Investment securities, fair value	3,536,000	3,828,000
Federal Home Loan Bank Advances
Borrowing Arrangements
Short-Term Debt		$ 90,000,000
Debt, Weighted Average Interest Rate		0.86%
Federal Home Loan Bank Advances \| Asset Pledged as Collateral
Borrowing Arrangements
Total loans	1,200,000,000
Remaining borrowing capacity	709,400,000
Investment securities, amortized cost	156,700,000	$ 153,100,000
Investment securities, fair value	198,400,000	193,400,000
Federal Home Loan Bank of San Francisco \| Federal Home Loan Bank Advances
Borrowing Arrangements
Advances from FHLB		$ 35,000,000
Advances from FHLB, weighted average interest rate		5.70%
Federal Home Loan Bank of San Francisco \| Federal Home Loan Bank Advances \| FHLB Advance Maturing August 2025
Borrowing Arrangements
Advances from FHLB	$ 73,000,000
Advances from FHLB, weighted average interest rate	4.02%

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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