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Note 4 - Loan Receivables and Allowance for Loan and Lease Losses - Impaired Loans (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Impaired loans, related allowance	$ 1,900,000		$ 1,400,000
Impaired loans, recorded investment	29,000,000		24,400,000
With no allowance recorded, average recorded investment	14,016,000	$ 9,978,000
With no allowance recorded, interest income recognized	65,000	29,000
With allowance recorded, average recorded investment	9,512,000	8,887,000
With allowance recorded, interest income recognized	31,000	4,000
Impaired Loans, Average recorded investment	23,528,000	18,865,000
Impaired Loans, interest income recognized	96,000	33,000
Business Activities Loans [Member]
Impaired loans with no related allowance recorded, recorded investment	17,689,000		15,453,000
Impaired loans with no related allowance recorded, unpaid principal balance	18,828,000		16,692,000
Impaired loans with a related allowance recorded, recorded investment	11,275,000		8,930,000
Impaired loans with a related allowance recorded, unpaid principal balance	11,539,000		8,930,000
Impaired loans, related allowance	1,926,000		1,412,000
Impaired loans, recorded investment	28,964,000		24,383,000
Impaired loans, unpaid principal balance	30,367,000		25,622,000
Commercial Real Estate Portfolio Segment [Member]
With no allowance recorded, average recorded investment	6,078,000	3,467,000
With no allowance recorded, interest income recognized
With allowance recorded, average recorded investment	8,813,000	8,808,000
With allowance recorded, interest income recognized		1,000
Impaired Loans, Average recorded investment	14,891,000	12,275,000
Impaired Loans, interest income recognized		1,000
Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member]
Impaired loans with no related allowance recorded, recorded investment	8,214,000		5,723,000
Impaired loans with no related allowance recorded, unpaid principal balance	9,135,000		6,644,000
Impaired loans with a related allowance recorded, recorded investment	8,820,000		8,811,000
Impaired loans with a related allowance recorded, unpaid principal balance	8,820,000		8,811,000
Impaired loans, related allowance	1,415,000		1,398,000
Impaired loans, recorded investment	17,034,000		14,534,000
Impaired loans, unpaid principal balance	17,955,000		15,455,000
Residential Portfolio Segment [Member]
With no allowance recorded, average recorded investment	4,248,000	3,578,000
With no allowance recorded, interest income recognized	13,000	20,000
With allowance recorded, average recorded investment	190,000	28,000
With allowance recorded, interest income recognized	3,000	2,000
Impaired Loans, Average recorded investment	4,438,000	3,606,000
Impaired Loans, interest income recognized	16,000	22,000
Residential Portfolio Segment [Member] | Business Activities Loans [Member]
Impaired loans with no related allowance recorded, recorded investment	4,138,000		3,853,000
Impaired loans with no related allowance recorded, unpaid principal balance	4,212,000		3,900,000
Impaired loans with a related allowance recorded, recorded investment	435,000		109,000
Impaired loans with a related allowance recorded, unpaid principal balance	452,000		109,000
Impaired loans, related allowance	8,000		4,000
Impaired loans, recorded investment	4,573,000		3,962,000
Impaired loans, unpaid principal balance	4,664,000		4,009,000
Commercial Portfolio Segment [Member]
With no allowance recorded, average recorded investment	2,745,000	2,082,000
With no allowance recorded, interest income recognized	46,000	1,000
With allowance recorded, average recorded investment	462,000
With allowance recorded, interest income recognized	26,000
Impaired Loans, Average recorded investment	3,207,000	2,082,000
Impaired Loans, interest income recognized	72,000	1,000
Commercial Portfolio Segment [Member] | Business Activities Loans [Member]
Impaired loans with no related allowance recorded, recorded investment	4,684,000		4,700,000
Impaired loans with no related allowance recorded, unpaid principal balance	4,803,000		4,816,000
Impaired loans with a related allowance recorded, recorded investment	1,848,000
Impaired loans with a related allowance recorded, unpaid principal balance	2,063,000
Impaired loans, related allowance	501,000
Impaired loans, recorded investment	6,532,000		4,700,000
Impaired loans, unpaid principal balance	6,866,000		4,816,000
Consumer Portfolio Segment [Member]
With no allowance recorded, average recorded investment	945,000	851,000
With no allowance recorded, interest income recognized	6,000	8,000
With allowance recorded, average recorded investment	47,000	51,000
With allowance recorded, interest income recognized	2,000	1,000
Impaired Loans, Average recorded investment	992,000	902,000
Impaired Loans, interest income recognized	8,000	9,000
Consumer Portfolio Segment [Member] | Business Activities Loans [Member]
Impaired loans with no related allowance recorded, recorded investment	653,000		1,177,000
Impaired loans with no related allowance recorded, unpaid principal balance	678,000		1,332,000
Impaired loans with a related allowance recorded, recorded investment	172,000		10,000
Impaired loans with a related allowance recorded, unpaid principal balance	204,000		10,000
Impaired loans, related allowance	2,000		10,000
Impaired loans, recorded investment	825,000		1,187,000
Impaired loans, unpaid principal balance	882,000		$ 1,342,000
Construction Portfolio Segment [Member]
With no allowance recorded, average recorded investment
With no allowance recorded, interest income recognized

X

- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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