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Note 7 - Loans - Contractual Aging of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Loans current and past due less than 30 days	$ 1,149,054	$ 1,166,748
Loans receivable	1,167,473	1,182,222
Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	13,053	10,023
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	5,366	5,451
Residential Portfolio Segment [Member]
Loans current and past due less than 30 days	569,440	573,938
Loans receivable	581,626	586,580
Residential Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	8,331	8,414
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	3,855	4,228
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Senior Lien [Member]
Loans current and past due less than 30 days	497,246	499,024
Loans receivable	508,387	510,641
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Senior Lien [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	7,817	7,839
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Senior Lien [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	3,324	3,778
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Junior Lien [Member]
Loans current and past due less than 30 days	26,564	27,041
Loans receivable	27,028	27,503
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Junior Lien [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	40	83
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Junior Lien [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	424	379
Residential Portfolio Segment [Member] | Home Equity Line of Credit 1 [Member]
Loans current and past due less than 30 days	31,509	33,115
Loans receivable	32,090	33,638
Residential Portfolio Segment [Member] | Home Equity Line of Credit 1 [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	474	452
Residential Portfolio Segment [Member] | Home Equity Line of Credit 1 [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	107	71
Residential Portfolio Segment [Member] | Construction Loans [Member]
Loans current and past due less than 30 days	14,121	14,758
Loans receivable	14,121	14,798
Residential Portfolio Segment [Member] | Construction Loans [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	0	40
Residential Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	0	0
Commercial Portfolio Segment [Member]
Loans current and past due less than 30 days	563,418	576,314
Loans receivable	569,331	578,901
Commercial Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	4,537	1,420
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	1,376	1,167
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Loans current and past due less than 30 days	294,408	299,640
Loans receivable	295,860	301,227
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	574	737
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	878	850
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Loans current and past due less than 30 days	33,145	33,505
Loans receivable	33,340	33,555
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	145	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	50	50
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans current and past due less than 30 days	128,435	126,221
Loans receivable	132,308	126,374
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	3,742	16
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	131	137
Commercial Portfolio Segment [Member] | Political Subdivisions [Member]
Loans current and past due less than 30 days	43,613	53,570
Loans receivable	43,613	53,570
Commercial Portfolio Segment [Member] | Political Subdivisions [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	0	0
Commercial Portfolio Segment [Member] | Political Subdivisions [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	0	0
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member]
Loans current and past due less than 30 days	11,208	11,455
Loans receivable	11,524	12,251
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	0	666
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	316	130
Commercial Portfolio Segment [Member] | Multifamily 5 or More Residential [Member]
Loans current and past due less than 30 days	32,370	31,070
Loans receivable	32,370	31,070
Commercial Portfolio Segment [Member] | Multifamily 5 or More Residential [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	0	0
Commercial Portfolio Segment [Member] | Multifamily 5 or More Residential [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	0	0
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Loans current and past due less than 30 days	3,809	4,318
Loans receivable	3,886	4,319
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	76	1
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	1	0
Commercial Portfolio Segment [Member] | Other Commercial Loans [Member]
Loans current and past due less than 30 days	16,430	16,535
Loans receivable	16,430	16,535
Commercial Portfolio Segment [Member] | Other Commercial Loans [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	0	0
Commercial Portfolio Segment [Member] | Other Commercial Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	0	0
Consumer Portfolio Segment [Member]
Loans current and past due less than 30 days	16,196	16,496
Loans receivable	16,516	16,741
Consumer Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	185	189
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	$ 135	$ 56

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