Note 10 - Deposits (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Time Deposits	$ 2,623,391	$ 2,500,000
Deposits Received for Securities Loaned, at Carrying Value	920,100	916,800
Time Deposit Liability, above US Insurance Limit	$ 647,900	$ 643,400