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Note 8 - Borrowings (Details Textual) - USD ($)
$ in Thousands
Mar. 25, 2021
Sep. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
May 20, 2022
Federal Home Loan Bank, Advances, Maximum Available Credit to Bank Assets, Percentage   35.00%      
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds   $ 226,100   $ 253,800  
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   907,300   896,200  
Letters of Credit Outstanding, Amount   60,000      
Asset Pledged as Collateral [Member] | Letter of Credit [Member]          
Debt Securities       12,900  
Revolving Credit Facility [Member] | NexBank [Member]          
Line of Credit Facility, Maximum Borrowing Capacity         $ 20,000
Revolving Credit Facility [Member] | Bank Term Funding [Member]          
Line of Credit Facility, Maximum Borrowing Capacity       15,200  
Line of Credit, Current     $ 0    
Debt Instrument, Notes Due 2031 [Member]          
Subordinated Debt, Ending Balance $ 40,000        
Debt Instrument, Interest Rate, Stated Percentage 3.75%        
Proceeds from Issuance of Subordinated Long-Term Debt $ 39,300        
Federal Home Loan Bank of San Francisco [Member]          
Federal Reserve Bank Advances, Available Amount   18,700   6,600  
Bellevue Washington Branch [Member]          
Letters of Credit Outstanding, Amount   772,000,000      
Securities Investment [Member] | Federal Home Loan Bank of San Francisco [Member]          
Federal Reserve Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   $ 19,300   $ 6,900