Note 1 - Business Description (Details Textual) $ in Thousands	127 Months Ended
	Jan. 31, 2022	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Assets		$ 4,069,354		$ 3,919,058
Loans Held for Investment and Held for Sale, Gross		3,100,000
Deposits		3,154,072		2,977,683
Equity, Including Portion Attributable to Noncontrolling Interest		$ 502,511	$ 500,290	$ 484,563	$ 469,595	$ 461,503	$ 466,683
Number of Businesses Acquired	6