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Note 8 - Loans - Loan Balances and Allowance for Loan Losses for Each Impairment Method (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loans receivable: individually evaluated	$ 5,486,000	$ 9,774,000
Loans receivable: collectively evaluated	939,762,000	817,789,000
Loans receivable	1,182,222,000	827,563,000
Allowance for loan losses: individually evaluated	1,051,000	1,605,000
Allowance for loan losses: collectively evaluated	8,200,000	7,205,000
Allowance for loan losses	9,836,000	9,309,000	$ 8,856,000
Financial Asset Acquired and No Credit Deterioration [Member]
Loans receivable	236,974,000	827,563,000
Residential Portfolio Segment [Member]
Loans receivable: individually evaluated	1,391,000	1,284,000
Loans receivable: collectively evaluated	476,703,000	455,522,000
Loans receivable	586,580,000	456,806,000
Allowance for loan losses: individually evaluated	176,000	116,000
Allowance for loan losses: collectively evaluated	4,006,000	3,870,000
Allowance for loan losses	4,182,000	3,986,000	3,963,000
Residential Portfolio Segment [Member] | Financial Asset Acquired and No Credit Deterioration [Member]
Loans receivable	108,486,000	456,806,000
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Senior Lien [Member]
Loans receivable: individually evaluated	1,023,000	991,000
Loans receivable: collectively evaluated	405,186,000	371,348,000
Loans receivable	510,641,000	372,339,000
Allowance for loan losses: individually evaluated	0	0
Allowance for loan losses: collectively evaluated	3,405,000	3,156,000
Allowance for loan losses	3,405,000	3,156,000	3,200,000
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Senior Lien [Member] | Financial Asset Acquired and No Credit Deterioration [Member]
Loans receivable	104,432,000	372,339,000
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Junior Lien [Member]
Loans receivable: individually evaluated	368,000	293,000
Loans receivable: collectively evaluated	24,730,000	25,157,000
Loans receivable	27,503,000	25,450,000
Allowance for loan losses: individually evaluated	176,000	116,000
Allowance for loan losses: collectively evaluated	208,000	209,000
Allowance for loan losses	384,000	325,000	224,000
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Junior Lien [Member] | Financial Asset Acquired and No Credit Deterioration [Member]
Loans receivable	2,405,000	25,450,000
Residential Portfolio Segment [Member] | Home Equity Line of Credit 1 [Member]
Loans receivable: individually evaluated	0	0
Loans receivable: collectively evaluated	32,147,000	34,319,000
Loans receivable	33,638,000	34,319,000
Allowance for loan losses: individually evaluated	0	0
Allowance for loan losses: collectively evaluated	276,000	302,000
Allowance for loan losses	276,000	302,000	296,000
Residential Portfolio Segment [Member] | Home Equity Line of Credit 1 [Member] | Financial Asset Acquired and No Credit Deterioration [Member]
Loans receivable	1,491,000	34,319,000
Residential Portfolio Segment [Member] | Construction Loans [Member]
Loans receivable: individually evaluated	0	0
Loans receivable: collectively evaluated	14,640,000	24,698,000
Loans receivable	14,798,000	24,698,000
Allowance for loan losses: individually evaluated	0	0
Allowance for loan losses: collectively evaluated	117,000	203,000
Allowance for loan losses	117,000	203,000	243,000
Residential Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset Acquired and No Credit Deterioration [Member]
Loans receivable	158,000	24,698,000
Commercial Portfolio Segment [Member]
Loans receivable: individually evaluated	4,095,000	8,473,000
Loans receivable: collectively evaluated	446,318,000	345,154,000
Loans receivable	578,901,000	353,627,000
Allowance for loan losses: individually evaluated	875,000	1,489,000
Allowance for loan losses: collectively evaluated	3,913,000	3,102,000
Allowance for loan losses	4,788,000	4,591,000	4,235,000
Commercial Portfolio Segment [Member] | Financial Asset Acquired and No Credit Deterioration [Member]
Loans receivable	128,488,000	353,627,000
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Loans receivable: individually evaluated	684,000	4,302,000
Loans receivable: collectively evaluated	198,532,000	158,309,000
Loans receivable	301,227,000	162,611,000
Allowance for loan losses: individually evaluated	0	781,000
Allowance for loan losses: collectively evaluated	1,921,000	1,757,000
Allowance for loan losses	1,921,000	2,538,000	2,584,000
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset Acquired and No Credit Deterioration [Member]
Loans receivable	102,011,000	162,611,000
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Loans receivable: individually evaluated	1,261,000	0
Loans receivable: collectively evaluated	29,710,000	11,962,000
Loans receivable	33,555,000	11,962,000
Allowance for loan losses: individually evaluated	678,000	0
Allowance for loan losses: collectively evaluated	288,000	110,000
Allowance for loan losses	966,000	110,000	150,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset Acquired and No Credit Deterioration [Member]
Loans receivable	2,584,000	11,962,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans receivable: individually evaluated	1,467,000	2,157,000
Loans receivable: collectively evaluated	122,313,000	89,699,000
Loans receivable	126,374,000	91,856,000
Allowance for loan losses: individually evaluated	149,000	659,000
Allowance for loan losses: collectively evaluated	1,242,000	894,000
Allowance for loan losses	1,391,000	1,553,000	1,065,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset Acquired and No Credit Deterioration [Member]
Loans receivable	2,594,000	91,856,000
Commercial Portfolio Segment [Member] | Political Subdivisions [Member]
Loans receivable: individually evaluated	0	0
Loans receivable: collectively evaluated	53,570,000	53,263,000
Loans receivable	53,570,000	53,263,000
Allowance for loan losses: individually evaluated	0	0
Allowance for loan losses: collectively evaluated	0	0
Allowance for loan losses	0	0
Commercial Portfolio Segment [Member] | Political Subdivisions [Member] | Financial Asset Acquired and No Credit Deterioration [Member]
Loans receivable	0	53,263,000
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member]
Loans receivable: individually evaluated	607,000	1,349,000
Loans receivable: collectively evaluated	11,386,000	5,797,000
Loans receivable	12,251,000	7,146,000
Allowance for loan losses: individually evaluated	48,000	49,000
Allowance for loan losses: collectively evaluated	110,000	53,000
Allowance for loan losses	158,000	102,000	105,000
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member] | Financial Asset Acquired and No Credit Deterioration [Member]
Loans receivable	258,000	7,146,000
Commercial Portfolio Segment [Member] | Multifamily 5 or More Residential [Member]
Loans receivable: individually evaluated	0	0
Loans receivable: collectively evaluated	10,617,000	7,180,000
Loans receivable	31,070,000	7,180,000
Allowance for loan losses: individually evaluated	0	0
Allowance for loan losses: collectively evaluated	156,000	114,000
Allowance for loan losses	156,000	114,000	172,000
Commercial Portfolio Segment [Member] | Multifamily 5 or More Residential [Member] | Financial Asset Acquired and No Credit Deterioration [Member]
Loans receivable	20,453,000	7,180,000
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Loans receivable: individually evaluated	76,000	665,000
Loans receivable: collectively evaluated	4,243,000	4,994,000
Loans receivable	4,319,000	5,659,000
Allowance for loan losses: individually evaluated	0	0
Allowance for loan losses: collectively evaluated	41,000	46,000
Allowance for loan losses	41,000	46,000	57,000
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Financial Asset Acquired and No Credit Deterioration [Member]
Loans receivable	0	5,659,000
Commercial Portfolio Segment [Member] | Other Commercial Loans [Member]
Loans receivable: individually evaluated	0	0
Loans receivable: collectively evaluated	15,947,000	13,950,000
Loans receivable	16,535,000	13,950,000
Allowance for loan losses: individually evaluated	0	0
Allowance for loan losses: collectively evaluated	155,000	128,000
Allowance for loan losses	155,000	128,000	102,000
Commercial Portfolio Segment [Member] | Other Commercial Loans [Member] | Financial Asset Acquired and No Credit Deterioration [Member]
Loans receivable	588,000	13,950,000
Consumer Portfolio Segment [Member]
Loans receivable: individually evaluated	0	17,000
Loans receivable: collectively evaluated	16,741,000	17,113,000
Loans receivable	16,741,000	17,130,000
Allowance for loan losses: individually evaluated	0	0
Allowance for loan losses: collectively evaluated	281,000	233,000
Allowance for loan losses	281,000	233,000	159,000
Consumer Portfolio Segment [Member] | Financial Asset Acquired and No Credit Deterioration [Member]
Loans receivable	0	17,130,000
Unallocated Financing Receivables [Member]
Loans receivable: individually evaluated	0	0
Loans receivable: collectively evaluated	0	0
Loans receivable	0	0
Allowance for loan losses: individually evaluated	0	0
Allowance for loan losses: collectively evaluated		0
Allowance for loan losses	$ 585,000	$ 499,000	$ 499,000

X

- Definition

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

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