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Note 4 - Mortgage Servicing Rights (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Asset $ 1,640,000 $ 1,640,000    
Mortgage Servicing Rights [Member]        
Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Asset 1,639,890 1,639,890   $ 1,632,141
Servicing Asset at Fair Value, Amount 21,691 $ 21,691   $ 21,043
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Prepayment Speed, Percent   20.00%    
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset $ 1,100 $ 3,300 $ 3,600  
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Discount Rate, Percent   10.00%