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Note 5 - Loans and Leases - Classifications of Loans and Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Notes receivable, gross	$ 1,699,107	$ 1,687,137
Allowance for credit losses on loans	(18,886)	(18,806)	$ (17,910)	$ (17,149)
Unearned lease revenue	(2,079)	(2,039)
Loans and leases, net	1,678,142	1,666,292
Commercial Portfolio Segment [Member]
Allowance for credit losses on loans	(1,904)	(1,850)	(2,550)	(2,924)
Commercial Portfolio Segment [Member] | Commercial [Member]
Notes receivable, gross	152,953	152,640
Commercial Portfolio Segment [Member] | Municipal [Member]
Notes receivable, gross	113,058	94,724
Commercial Real Estate Portfolio Segment [Member]
Allowance for credit losses on loans	(8,824)	(8,835)	(8,157)	(7,162)
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member]
Notes receivable, gross	305,962	311,565
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Notes receivable, gross	299,394	304,399
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Notes receivable, gross	48,473	39,823
Consumer Portfolio Segment [Member]
Allowance for credit losses on loans	(2,263)	(2,391)	(2,448)	(2,827)
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Notes receivable, gross	55,626	56,640
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member]
Notes receivable, gross	52,564	52,348
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Recourse [Member]
Notes receivable, gross	10,980	10,756
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Nonrecourse [Member]
Notes receivable, gross	102,622	112,595
Consumer Portfolio Segment [Member] | Direct Financing Lease [Member]
Notes receivable, gross	32,544	33,601
Consumer Portfolio Segment [Member] | Other Loan [Member]
Notes receivable, gross	16,045	16,500
Residential Portfolio Segment [Member]
Allowance for credit losses on loans	(5,846)	(5,694)	$ (4,683)	$ (4,169)
Residential Portfolio Segment [Member] | Construction Loans [Member]
Notes receivable, gross	33,174	36,536
Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Notes receivable, gross	$ 475,712	$ 465,010

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