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Note 10 - Commitments and Contingencies (Details Textual) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Assets $ 2,596,901 $ 2,387,814 $ 2,252,331
Unfunded Individual Credit Commitment [Member]      
Other Commitment 2,400,000    
Unfunded Individual Credit Commitment [Member] | Contractual Obligations [Member]      
Assets 18,700    
Unfunded Outstanding Floor-Plan Financing Commitment [Member]      
Other Commitment 9,800    
Credit Protection Program [Member]      
Loss Contingency, Estimate of Possible Loss $ 68,600