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Note 4 - Mortgage Servicing Rights - Schedule of Sensitivity Analysis of Fair Value (Details) - Mortgage Servicing Rights [Member] - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Aggregate portfolio principal balance $ 1,620,000 $ 2,830,000
Conditional prepayment rate 11.80% 7.20%
Fair value MSRs $ 19,900 $ 38,200
Discount rate 9.30% 9.40%
Base Rate [Member]    
Aggregate portfolio principal balance $ 1,622,390 $ 2,832,016
Weighted average rate of loans in MSRs portfolio 4.20% 3.60%
Base Rate [Member] | Measurement Input, Prepayment Rate [Member]    
Conditional prepayment rate 11.80% 7.20%
Fair value MSRs $ 19,901 $ 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 1.20% 1.30%
Base Rate [Member] | Measurement Input, Discount Rate [Member]    
Fair value MSRs $ 19,901 $ 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 1.20% 1.30%
Discount rate 9.30% 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 14.50% 8.00%
Fair value MSRs $ 18,935 $ 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 1.20% 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 $ 19,475 $ 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 1.20% 1.30%
Discount rate 9.80% 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 17.00% 9.30%
Fair value MSRs $ 18,097 $ 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 1.10% 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 $ 19,066 $ 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 10.30% 10.40%