Note 1 - Business Description (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Assets, Total		$ 3,969,037		$ 4,228,194
Loans Held for Investment and Held for Sale, Gross		3,000,000
Deposits, Total		3,027,565		3,385,532
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance		463,707	$ 464,825	$ 466,683	$ 442,325	$ 435,668	$ 428,488
Gateway Bank [Member]
Deposits, Total		145,900
Tangible Equity		$ 13,500
Gateway Bank [Member] | Forecast [Member]
Payments to Acquire Businesses, Gross	$ 22,900