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Note 10 - Borrowing Arrangements (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Financing Receivable, before Allowance for Credit Loss [1] $ 3,027,361,000   $ 3,031,861,000
Long-Term Federal Home Loan Bank Advances $ 150,000,000    
Federal Home Loan Bank, Advances, Activity for Year, Average Interest Rate at Period End 1.18%    
Advances from Federal Home Loan Banks, Total $ 150,000,000   150,000,000
Other Financial Institutions [Member]      
Line of Credit Facility, Maximum Borrowing Capacity $ 92,000,000    
Federal Home Loan Bank Advances [Member]      
Debt Instrument, Term (Year) 5 years    
Interest Paid, Including Capitalized Interest, Operating and Investing Activities $ 439,000 $ 1,400,000  
Unsecured Debt [Member] | Other Financial Institutions [Member]      
Line of Credit Facility, Maximum Borrowing Capacity 80,000,000    
Secured Debt [Member] | Other Financial Institutions [Member]      
Line of Credit Facility, Maximum Borrowing Capacity 12,000,000    
Federal Home Loan Bank Overnight Advances [Member]      
Long-Term Federal Home Loan Bank Advances 0    
Advances from Federal Home Loan Banks, Total 0   $ 0
Asset Pledged as Collateral [Member] | Other Financial Institutions [Member]      
Financing Receivable, before Allowance for Credit Loss 21,100,000    
Federal Home Loan Bank Secured Line of Credit [Member]      
Line of Credit Facility, Maximum Borrowing Capacity 1,000,000,000    
Federal Home Loan Bank Secured Line of Credit [Member] | Asset Pledged as Collateral [Member]      
Financing Receivable, before Allowance for Credit Loss 1,400,000,000    
Federal Home Loan Bank of San Francisco Secured Line of Credit [Member]      
Line of Credit Facility, Maximum Borrowing Capacity 43,900,000    
Federal Home Loan Bank of San Francisco Secured Line of Credit [Member] | Asset Pledged as Collateral [Member]      
Financing Receivable, before Allowance for Credit Loss $ 62,400,000    
[1] Net of discounts and deferred fees and costs.