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Note 3 - Investment Securities Available for Sale (Details Textual)
3 Months Ended
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain (Loss), before Tax $ (33,240,000)   $ (46,088,000)
Available-for-sale Securities Income Tax Expense (Benefit) on Accumulated Gross Unrealized Gains Losses $ (9,825,000)   (13,624,000)
Number of Securities Sold During Period 155 0  
Proceeds from Sale of Debt Securities, Available-for-Sale $ 114,838,000 $ 0  
Debt Securities, Available-for-Sale, Realized Gain (Loss) (19,826,000)    
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss $ 0    
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 309    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions 43    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 186    
Available-for-sale Debt Securities Pledged to Secure Deposits and Repurchase Agreements Amortized Cost Basis $ 288,168,000   316,733,000
Asset Pledged as Collateral [Member] | Deposits [Member]      
Debt Securities, Available-for-Sale, Restricted $ 268,944,000   $ 285,534,000
Debt Securities, Available-for-Sale, 9 Securities [Member]      
Number of Securities Sold During Period 9    
Debt Securities, Available-for-Sale, Realized Gain (Loss) $ 86,000    
Debt Securities, Available-for-Sale, 146 Securities [Member]      
Number of Securities Sold During Period 146    
Debt Securities, Available-for-Sale, Realized Gain (Loss) $ (19,912,000)    
US Treasury Securities [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 2    
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 90    
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 46    
US States and Political Subdivisions Debt Securities [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 171