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Note 5 - Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Beginning balance	$ 22,820	$ 18,561	$ 18,816	$ 17,577	$ 17,577
Provision for loan losses	3,861	824	8,815	1,731	2,390
Charge-offs on loans	(48)	0	(998)	110	(1,259)
Recoveries on loans	1	1	1		108
Ending balance	26,634	19,386	26,634	19,386	18,816
Recoveries on loans				(32)
Loan losses, Reserves	26,634	19,386	26,634	19,386	18,816
Individually	17,976	9,628	17,976	9,628	13,218
Collectively	2,737,177	2,116,517	2,737,177	2,116,517	2,183,716
Total loans, net of deferred loan fees	2,755,153	2,126,145	2,755,153	2,126,145	2,196,934
Specific Reserve [Member]
Loan losses, Reserves	436	430	436	430	0
General Reserves [Member]
Loan losses, Reserves	26,198	18,956	26,198	18,956	18,816
Commercial Real Estate Portfolio Segment [Member]
Beginning balance	18,985	14,582	15,118	13,437	13,437
Provision for loan losses	2,858	558	6,725	1,703	1,847
Charge-offs on loans	0	0	0	0	(166)
Recoveries on loans	0	0	0	0	0
Ending balance	21,843	15,140	21,843	15,140	15,118
Loan losses, Reserves	21,843	15,140	21,843	15,140	15,118
Individually	6,119	4,537	6,119	4,537	3,795
Collectively	2,316,619	1,773,616	2,316,619	1,773,616	1,842,747
Total loans, net of deferred loan fees	2,322,738	1,778,153	2,322,738	1,778,153	1,846,542
Commercial Real Estate Portfolio Segment [Member] | Specific Reserve [Member]
Loan losses, Reserves	0	127	0	127	0
Commercial Real Estate Portfolio Segment [Member] | General Reserves [Member]
Loan losses, Reserves	21,843	15,013	21,843	15,013	15,118
Commercial Portfolio Segment [Member]
Beginning balance	3,813	3,976	3,588	4,140	4,140
Provision for loan losses	990	25	2,165	(216)	433
Charge-offs on loans	(48)	0	(998)	110	(1,093)
Recoveries on loans	1	1	1		108
Ending balance	4,756	4,002	4,756	4,002	3,588
Recoveries on loans				(32)
Loan losses, Reserves	4,756	4,002	4,756	4,002	3,588
Individually	11,842	5,091	11,842	5,091	9,423
Collectively	417,242	342,365	417,242	342,365	340,148
Total loans, net of deferred loan fees	429,084	347,456	429,084	347,456	349,571
Commercial Portfolio Segment [Member] | Specific Reserve [Member]
Loan losses, Reserves	436	303	436	303	0
Commercial Portfolio Segment [Member] | General Reserves [Member]
Loan losses, Reserves	4,320	3,699	4,320	3,699	3,588
Other Financing Receivables [Member]
Beginning balance	22	3	9	0	0
Provision for loan losses	13	3	26	6	9
Charge-offs on loans	0	0	0	0	0
Recoveries on loans	0	0	0	0	0
Ending balance	35	6	35	6	9
Loan losses, Reserves	35	6	35	6	9
Individually	15	0	15	0	0
Collectively	3,316	536	3,316	536	821
Total loans, net of deferred loan fees	3,331	536	3,331	536	821
Other Financing Receivables [Member] | Specific Reserve [Member]
Loan losses, Reserves	0	0	0	0	0
Other Financing Receivables [Member] | General Reserves [Member]
Loan losses, Reserves	35	6	35	6	9
Unallocated Financing Receivables [Member]
Beginning balance	0	0	101	0	0
Provision for loan losses	0	238	(101)	238	101
Charge-offs on loans	0	0	0	0	0
Recoveries on loans	0	0	0	0	0
Ending balance	0	238	0	238	101
Loan losses, Reserves	0	238	0	238	101
Individually	0	0	0	0	0
Collectively	0	0	0	0	0
Total loans, net of deferred loan fees	0	0	0	0	0
Unallocated Financing Receivables [Member] | Specific Reserve [Member]
Loan losses, Reserves	0	0	0	0	0
Unallocated Financing Receivables [Member] | General Reserves [Member]
Loan losses, Reserves	$ 0	$ 238	$ 0	$ 238	$ 101

X

- Definition

Allowance for credit losses reserve change in method of calculating impairment.

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Amount of reversal of the recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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