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Note 6 - Fair Values of Assets and Liabilities - Reconciliation of Level 3 Assets (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Balance |  | $ 2,173,759 | $ 1,817,976
Changes in fair value of loans at fair value, included in earnings |  | 101,035 | 39,877
Changes in fair value due to principal charge-offs, net of recoveries |  | (463,076) | (382,412)
Changes in fair value due to finance and fee charge-offs |  | (187,120) | (162,970)
Total Changes in fair value of loans (1) | [1] | (549,161) | (505,505)
Purchases |  | 1,969,259 | 1,801,802
Finance and fees, added to the account balance |  | 785,847 | 701,784
Settlements |  | (1,868,085) | (1,766,064)
Balance at September 30,(2) | [2] | $ 2,511,619 | $ 2,049,993
[1] | Total Changes in fair value of loans is included in our Condensed Consolidated Statements of Income
[2] | As of September 30, 2024 and September 30, 2023, the aggregate unpaid principal balance included within loans at fair value was $2,420 million and $2,096 million, respectively.

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