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Note 11 - Borrowing Arrangements (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, before Allowance for Credit Loss [1] $ 3,031,861 $ 3,336,449  
Long-Term Federal Home Loan Bank Advances $ 150,000    
Federal Home Loan Bank, Advances, Activity for Year, Average Interest Rate at Period End 1.18%    
Advances from Federal Home Loan Banks, Total $ 150,000 220,000  
Federal Home Loan Bank Advances [Member]      
Debt Instrument, Term (Year) 5 years    
Interest Paid, Including Capitalized Interest, Operating and Investing Activities $ 2,900 $ 2,900 $ 1,800
Federal Reserve Bank of San Francisco Secured Line of Credit [Member]      
Line of Credit Facility, Maximum Borrowing Capacity 42,300    
Federal Reserve Bank of San Francisco Secured Line of Credit [Member] | Asset Pledged as Collateral [Member]      
Financing Receivable, before Allowance for Credit Loss 62,800    
Federal Home Loan Bank Secured Line of Credit [Member]      
Line of Credit Facility, Maximum Borrowing Capacity 1,000,000    
Federal Home Loan Bank Secured Line of Credit [Member] | Asset Pledged as Collateral [Member]      
Financing Receivable, before Allowance for Credit Loss 1,500,000    
Federal Home Loan Bank Overnight Advances [Member]      
Long-Term Federal Home Loan Bank Advances 0    
Advances from Federal Home Loan Banks, Total 0    
Other Financial Institutions [Member]      
Line of Credit Facility, Maximum Borrowing Capacity 92,000    
Wells Fargo Bank [Member] | Line of Credit [Member]      
Line of Credit Facility, Maximum Borrowing Capacity $ 2,000    
[1] net of discounts and deferred fees and costs