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Note 4 - Loan Receivable and Allowance for Loan and Lease Losses - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Impaired loans, related allowance	$ 1,700		$ 1,700		$ 1,400
Impaired loans, recorded investment	29,300		29,300		24,400
With no allowance recorded, average recorded investment	17,918	$ 12,958	15,721	$ 11,835
With no allowance recorded, interest income recognized	81	37	145	78
With allowance recorded, average recorded investment	11,200	9,009	10,224	8,923
With allowance recorded, interest income recognized	39	36	69	40
Impaired Loans, Average recorded investment	29,118	21,967	25,945	20,758
Impaired Loans, interest income recognized	120	73	214	118
Business Activities Loans [Member]
Impaired loans with no related allowance recorded, recorded investment	17,438		17,438		15,453
Impaired loans with no related allowance recorded, unpaid principal balance	18,623		18,623		16,692
Impaired loans with a related allowance recorded, recorded investment	11,895		11,895		8,930
Impaired loans with a related allowance recorded, unpaid principal balance	12,053		12,053		8,930
Impaired loans, related allowance	1,664		1,664		1,412
Impaired loans, recorded investment	29,333		29,333		24,383
Impaired loans, unpaid principal balance	30,676		30,676		25,622
Commercial Real Estate Portfolio Segment [Member]
With no allowance recorded, average recorded investment	8,188	6,256	6,979	5,170
With no allowance recorded, interest income recognized	39	13	39	26
With allowance recorded, average recorded investment	8,813	8,866	8,812	8,841
With allowance recorded, interest income recognized	0	34	0	35
Impaired Loans, Average recorded investment	17,001	15,122	15,791	14,011
Impaired Loans, interest income recognized	39	47	39	61
Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member]
Impaired loans with no related allowance recorded, recorded investment	8,153		8,153		5,723
Impaired loans with no related allowance recorded, unpaid principal balance	9,112		9,112		6,644
Impaired loans with a related allowance recorded, recorded investment	8,811		8,811		8,811
Impaired loans with a related allowance recorded, unpaid principal balance	8,811		8,811		8,811
Impaired loans, related allowance	1,252		1,252		1,398
Impaired loans, recorded investment	16,964		16,964		14,534
Impaired loans, unpaid principal balance	17,923		17,923		15,455
Residential Portfolio Segment [Member]
With no allowance recorded, average recorded investment	4,276	3,565	4,280	3,585
With no allowance recorded, interest income recognized	16	13	29	33
With allowance recorded, average recorded investment	270	55	201	31
With allowance recorded, interest income recognized	5	1	8	3
Impaired Loans, Average recorded investment	4,546	3,620	4,481	3,616
Impaired Loans, interest income recognized	21	14	37	36
Residential Portfolio Segment [Member] | Business Activities Loans [Member]
Impaired loans with no related allowance recorded, recorded investment	4,092		4,092		3,853
Impaired loans with no related allowance recorded, unpaid principal balance	4,196		4,196		3,900
Impaired loans with a related allowance recorded, recorded investment	427		427		109
Impaired loans with a related allowance recorded, unpaid principal balance	446		446		109
Impaired loans, related allowance	9		9		4
Impaired loans, recorded investment	4,519		4,519		3,962
Impaired loans, unpaid principal balance	4,642		4,642		4,009
Commercial Portfolio Segment [Member]
With no allowance recorded, average recorded investment	4,741	1,985	3,608	2,031
With no allowance recorded, interest income recognized	25	2	71	2
With allowance recorded, average recorded investment	2,031	0	1,161	0
With allowance recorded, interest income recognized	32	0	58	0
Impaired Loans, Average recorded investment	6,772	1,985	4,769	2,031
Impaired Loans, interest income recognized	57	2	129	2
Commercial Portfolio Segment [Member] | Business Activities Loans [Member]
Impaired loans with no related allowance recorded, recorded investment	4,666		4,666		4,700
Impaired loans with no related allowance recorded, unpaid principal balance	4,788		4,788		4,816
Impaired loans with a related allowance recorded, recorded investment	2,485		2,485		0
Impaired loans with a related allowance recorded, unpaid principal balance	2,592		2,592		0
Impaired loans, related allowance	401		401		0
Impaired loans, recorded investment	7,151		7,151		4,700
Impaired loans, unpaid principal balance	7,380		7,380		4,816
Consumer Portfolio Segment [Member]
With no allowance recorded, average recorded investment	713	1,152	854	1,049
With no allowance recorded, interest income recognized	1	9	6	17
With allowance recorded, average recorded investment	86	88	50	51
With allowance recorded, interest income recognized	2	1	3	2
Impaired Loans, Average recorded investment	799	1,240	904	1,100
Impaired Loans, interest income recognized	3	$ 10	9	$ 19
Consumer Portfolio Segment [Member] | Business Activities Loans [Member]
Impaired loans with no related allowance recorded, recorded investment	527		527		1,177
Impaired loans with no related allowance recorded, unpaid principal balance	527		527		1,332
Impaired loans with a related allowance recorded, recorded investment	172		172		10
Impaired loans with a related allowance recorded, unpaid principal balance	204		204		10
Impaired loans, related allowance	2		2		10
Impaired loans, recorded investment	699		699		1,187
Impaired loans, unpaid principal balance	$ 731		$ 731		$ 1,342

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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