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Note 8 - Loans - Contractual Aging of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loans current and past due less than 30 days	$ 1,166,748	$ 810,195
Loans receivable	1,182,222	827,563
Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	10,023	8,308
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	5,451	9,060
Residential Portfolio Segment [Member]
Loans current and past due less than 30 days	573,938	444,380
Loans receivable	586,580	456,806
Residential Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	8,414	7,245
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	4,228	5,181
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Senior Lien [Member]
Loans current and past due less than 30 days	499,024	361,362
Loans receivable	510,641	372,339
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Senior Lien [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	7,839	6,414
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	3,778	4,563
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Junior Lien [Member]
Loans current and past due less than 30 days	27,041	24,876
Loans receivable	27,503	25,450
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Junior Lien [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	83	184
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	379	390
Residential Portfolio Segment [Member] | Home Equity Line of Credit 1 [Member]
Loans current and past due less than 30 days	33,115	33,611
Loans receivable	33,638	34,319
Residential Portfolio Segment [Member] | Home Equity Line of Credit 1 [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	452	480
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	71	228
Residential Portfolio Segment [Member] | Construction Loans [Member]
Loans current and past due less than 30 days	14,758	24,531
Loans receivable	14,798	24,698
Residential Portfolio Segment [Member] | Construction Loans [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	40	167
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	576,314	348,824
Loans receivable	578,901	353,627
Commercial Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	1,420	970
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	1,167	3,833
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Loans current and past due less than 30 days	299,640	160,668
Loans receivable	301,227	162,611
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	737	226
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	850	1,717
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Loans current and past due less than 30 days	33,505	11,910
Loans receivable	33,555	11,962
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	50	52
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans current and past due less than 30 days	126,221	90,915
Loans receivable	126,374	91,856
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	16	152
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	137	789
Commercial Portfolio Segment [Member] | Political Subdivisions [Member]
Loans current and past due less than 30 days	53,570	53,263
Loans receivable	53,570	53,263
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	11,455	5,390
Loans receivable	12,251	7,146
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	666	487
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	130	1,269
Commercial Portfolio Segment [Member] | Multifamily 5 or More Residential [Member]
Loans current and past due less than 30 days	31,070	7,104
Loans receivable	31,070	7,180
Commercial Portfolio Segment [Member] | Multifamily 5 or More Residential [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	0	76
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	4,318	5,624
Loans receivable	4,319	5,659
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	1	29
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	0	6
Commercial Portfolio Segment [Member] | Other Commercial Loans [Member]
Loans current and past due less than 30 days	16,535	13,950
Loans receivable	16,535	13,950
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	16,496	16,991
Loans receivable	16,741	17,130
Consumer Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Loans past due	189	93
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	$ 56	$ 46

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