Note 2 - Business Combinations - Assets and Liabilities Acquired (Details) - USD ($) $ in Thousands	Feb. 07, 2022	Dec. 31, 2023	Dec. 31, 2022
Goodwill		$ 375,696	$ 375,696
HSBC Bank USA West Coast Mass Market Consumer and Retail Banking Business [Member]
Cash and cash equivalents	$ 473
Loans	641,839
Right-of-use assets - operating leases	6,453
Core deposit intangible	3,138
Other	561
Total assets	652,464
Deposits	575,163
Lease liabilities	6,453
Total liabilities assumed	581,616
Net assets acquired	70,848
Total cash paid at closing	74,355
Goodwill	$ 3,507