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Note 6 - Loans and the Allowance for Credit Losses - Impairment Evaluation on Loans and Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Individually analyzed, allowance for credit losses	$ 1,707		$ 941
Collectively evaluated	80,541		80,616
Total	82,494	$ 82,077	81,974	$ 88,230	$ 89,205	$ 90,513
Individually analyzed, gross loans	50,063		69,963
Collectively evaluated	8,065,814		8,281,394
Total	8,116,332		8,351,841
Financial Asset Acquired with Credit Deterioration [Member]
Individually analyzed, allowance for credit losses	246		417
Individually analyzed, gross loans	455		484
Commercial Portfolio Segment [Member]
Individually analyzed, allowance for credit losses	333		0
Collectively evaluated	19,238		20,215
Total	19,817	20,020	20,632	27,851	29,326	28,903
Individually analyzed, gross loans	12,027		15,336
Collectively evaluated	1,501,509		1,562,910
Total	1,513,991		1,578,730
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Individually analyzed, allowance for credit losses	246		417
Individually analyzed, gross loans	455		484
Commercial Real Estate Portfolio Segment [Member]
Individually analyzed, allowance for credit losses	1,374		941
Collectively evaluated	52,699		51,337
Total	54,073	53,098	52,278	52,733	52,509	53,742
Individually analyzed, gross loans	33,219		39,986
Collectively evaluated	5,701,951		5,855,559
Total	5,735,170		5,895,545
Commercial Real Estate Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Individually analyzed, allowance for credit losses	0		0
Individually analyzed, gross loans	0		0
Commercial Construction Portfolio Segment [Member]
Individually analyzed, allowance for credit losses	0		0
Collectively evaluated	4,165		4,739
Total	4,165	4,472	4,739	3,909	3,546	3,718
Individually analyzed, gross loans	2,204		8,700
Collectively evaluated	613,883		611,796
Total	616,087		620,496
Commercial Construction Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Individually analyzed, allowance for credit losses	0		0
Individually analyzed, gross loans	0		0
Residential Portfolio Segment [Member]
Individually analyzed, allowance for credit losses	0		0
Collectively evaluated	4,436		4,320
Total	4,436	4,484	4,320	3,732	3,819	4,143
Individually analyzed, gross loans	2,613		5,941
Collectively evaluated	247,636		250,100
Total	250,249		256,041
Residential Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Individually analyzed, allowance for credit losses	0		0
Individually analyzed, gross loans	0		0
Consumer Portfolio Segment [Member]
Individually analyzed, allowance for credit losses	0		0
Collectively evaluated	3		5
Total	3	$ 3	5	$ 5	$ 5	$ 7
Individually analyzed, gross loans	0		0
Collectively evaluated	835		1,029
Total	835		1,029
Consumer Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Individually analyzed, allowance for credit losses	0		0
Individually analyzed, gross loans	$ 0		$ 0

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