Note 3 - Bank Acquisitions (Details Textual)		3 Months Ended	12 Months Ended
	Mar. 07, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Business Combination, Consideration Transferred, Total			$ 0	$ 167,913,000	$ 232,946,000
Debt Securities, Held-to-Maturity, Fair Value, Total		$ 431,833,000	408,519,000	431,833,000
Goodwill		194,074,000	194,074,000	194,074,000	135,830,000	$ 12,513,000
Gain (Loss) on Disposition of Business			(0)	(870,000)	(0)
Goodwill, Written off Related to Sale of Business Unit			(0)	8,450,000	(0)
Business Combination, Acquisition Related Costs			0	19,500,000	19,025,000
Commonwealth [Member]
Gain (Loss) on Disposition of Business		870,000
Commonwealth [Member]
Business Combination, Consideration Transferred, Total	$ 167,913,000
Number of Branches	15
Debt Securities, Held-to-Maturity, Fair Value, Total	$ 162,000,000
Goodwill	67,000,000	58,244,000	$ 58,244,000	58,244,000
Business Acquisition, Transaction Costs	19,500,000
Goodwill, Written off Related to Sale of Business Unit		$ 8,500,000
Business Combination, Acquired Receivable, Fair Value	540,000,000
Business Combination, Acquired Receivables, Gross Contractual Amount	$ 549,000,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual				38,600,000
Commonwealth [Member] | Merger Related Credit Loss [Member]
Business Combination, Acquisition Related Costs				4,400,000	7,400,000
Commonwealth [Member] | Pre-tax Merger Expenses [Member]
Business Combination, Acquisition Related Costs				$ 24,100,000	$ 18,500,000
Commonwealth [Member] | Jefferson County in Kentucky [Member]
Number of Branches	9
Commonwealth [Member] | Shelby County in Kentucky [Member]
Number of Branches	4
Commonwealth [Member] | Northern Kentucky [Member]
Number of Branches	2