Note 8 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Feb. 07, 2022
Goodwill, Ending Balance	$ 375,696	$ 375,696
Amortization of Intangible Assets	1,310	1,892	$ 687
HSBC Bank USA West Coast Mass Market Consumer and Retail Banking Business [Member]
Goodwill, Ending Balance				$ 3,507
Core Deposits [Member]
Impairment of Intangible Assets, Finite-Lived	1,227	918
Amortization of Intangible Assets	1,300	1,900	687
Core Deposits [Member] | Amortization of Core Deposit Intangibles [Member]
Impairment of Intangible Assets, Finite-Lived	$ 1,200	918	$ 0
Core Deposits [Member] | HSBC Bank USA West Coast Mass Market Consumer and Retail Banking Business [Member]
Finite-Lived Intangible Assets Acquired		$ 3,100