Note 3 - Bank Acquisitions - Unaudited Pro Forma Information (Details) - Commonwealth [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Net interest income		$ 238,416	$ 218,376
Provision for credit losses	[1]	5,828	(7,667)
Non-interest income		92,089	123,530
Non-interest expense	[2]	182,783	200,941
Income before taxes		141,894	148,632
Income tax expense		32,212	31,443
Net income		109,682	117,189
Less net income attributed to NCI		337	362
Net income available to stockholders		$ 109,345	$ 116,827
Basic (in dollars per share)		$ 3.75	$ 4.02
Diluted (in dollars per share)		$ 3.72	$ 3.99
Basic weighted average shares outstanding (in shares)		29,122	29,037
Diluted weighted average shares outstanding (in shares)		29,386	29,295

[1] Excludes $4.4 million in merger related credit loss expense for the year ended December 31, 2022. Excludes $7.4 million in merger related credit loss expense for the year ended December 31, 2021.

[2] Excludes $24.1 million in pre-tax merger expenses for the year ended December 31, 2022. Excludes $18.5 million in pre-tax merger expenses for the year ended December 31, 2021.