v3.26.1
Loans and Allowance for Credit Losses - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Financing Receivable, Past Due [Line Items]          
Loans greater than 90 days past due $ 0   $ 0   $ 0
Residential real estate loans in the process of foreclosure 0   0   0
Interest income related to non-accrual loans 0 $ 0 0 $ 0  
Foregone interest income related to non-accrual loans 94,100 $ 35,600 148,500 $ 70,900  
Pledged loans 2,300,000,000   2,300,000,000   2,200,000,000
Federal Reserve Bank of San Francisco          
Financing Receivable, Past Due [Line Items]          
FRB pledged loans $ 1,500,000,000   $ 1,500,000,000   $ 1,300,000,000