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Note 4 - Mortgage Servicing Rights - Schedule of Sensitivity Analysis of Fair Value (Details) - Mortgage Servicing Rights [Member] - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Aggregate portfolio principal balance $ 1,600,000 $ 2,830,000
Conditional prepayment rate 8.50% 7.20%
Fair value MSRs $ 20,800 $ 38,200
Discount rate 10.00% 9.40%
Base Rate [Member]    
Aggregate portfolio principal balance $ 1,598,388 $ 2,832,016
Weighted average rate of loans in MSRs portfolio 4.10% 3.60%
Base Rate [Member] | Measurement Input, Prepayment Rate [Member]    
Conditional prepayment rate 8.50% 7.20%
Fair value MSRs $ 20,788 $ 38,163
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of Other than 10 or 20 Percent Adverse Change in Other Assumption, Percent 1.30% 1.30%
Base Rate [Member] | Measurement Input, Discount Rate [Member]    
Fair value MSRs $ 20,788 $ 38,163
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of Other than 10 or 20 Percent Adverse Change in Other Assumption, Percent 1.30% 1.30%
Discount rate 10.00% 9.40%
Sensitivity Analysis of Fair Value, Impact of 0.5 Percent Adverse Change in Other Assumption [Member] | Measurement Input, Prepayment Rate [Member]    
Conditional prepayment rate 10.10% 8.00%
Fair value MSRs $ 20,062 $ 37,268
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of Other than 10 or 20 Percent Adverse Change in Other Assumption, Percent 1.30% 1.30%
Sensitivity Analysis of Fair Value, Impact of 0.5 Percent Adverse Change in Other Assumption [Member] | Measurement Input, Discount Rate [Member]    
Fair value MSRs $ 20,340 $ 37,301
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of Other than 10 or 20 Percent Adverse Change in Other Assumption, Percent 1.30% 1.30%
Discount rate 10.50% 9.90%
Sensitivity Analysis of Fair Value, Impact of 1.0 Percent Adverse Change in Other Assumption [Member] | Measurement Input, Prepayment Rate [Member]    
Conditional prepayment rate 12.40% 9.30%
Fair value MSRs $ 19,188 $ 35,819
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of Other than 10 or 20 Percent Adverse Change in Other Assumption, Percent 1.20% 1.30%
Sensitivity Analysis of Fair Value, Impact of 1.0 Percent Adverse Change in Other Assumption [Member] | Measurement Input, Discount Rate [Member]    
Fair value MSRs $ 19,910 $ 36,476
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of Other than 10 or 20 Percent Adverse Change in Other Assumption, Percent 1.20% 1.30%
Discount rate 11.00% 10.40%