Note 1 - Business Description (Details Textual) $ in Thousands		144 Months Ended
	Dec. 28, 2021 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Assets		$ 4,075,618		$ 3,919,058
Loans Held for Investment and Held for Sale, Gross		3,200,000
Deposits		3,175,416		2,977,683
Equity, Including Portion Attributable to Noncontrolling Interest		$ 500,290	$ 494,757	$ 484,563	$ 461,503	$ 462,621	$ 466,683
Number of Businesses Acquired		6
Gateway Bank [Member]
Payments to Acquire Businesses, Gross	$ 22,900