Note 8 - Commitments and Off-balance Sheet Risk (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss	$ 56,590	$ 55,408	$ 49,914	$ 48,008	$ 44,721	$ 42,246
Retail and Commercial Lines of Credit and Credit Card Receivables [Member]
Financing Receivable, Allowance for Credit Loss	$ 800		$ 1,300

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant