Note 4 - Loans/Leases Receivable - Changes in the ACL for OBS exposures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Balance, beginning	$ 87,706	$ 78,721
Provisions (credited) to expense	11,550	9,636	$ 5,702
Balance, ending	87,200	87,706	78,721
Unfunded Loan Commitment
Balance, beginning	5,552	6,886
Provisions (credited) to expense	3,977	(1,334)
Balance, ending	$ 9,529	$ 5,552	$ 6,886