Note 1 - Nature of Operations - Summary of Significant Accounting Policies - (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	May 01, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2021	Mar. 22, 2021	Apr. 30, 2020	Dec. 31, 2018
Stockholders' Equity Attributable to Parent, Ending Balance		$ 433,368	$ 409,963	$ 285,097				$ 260,058
Assets, Total		4,726,378	4,160,360
Liabilities, Total		4,293,010	3,750,397
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total		0	0
Debt Securities, Trading, and Equity Securities, FV-NI, Total		0	0
Advertising Expense		$ 2,700	$ 1,600	$ 1,500
Smith Shellnut Wilson, LLC [Member]
Assets under Management, Carrying Amount						$ 3,500,000
Assets, Total					$ 3,600
Liabilities, Total					$ 2,300
Pedestal [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)	7,614,506
Assets, Fair Value Disclosure	$ 1,300,000
Loans Payable, Fair Value Disclosure	893,300
Deposits, Fair Value Disclosure	1,200,000
Stockholders' Equity Attributable to Parent, Ending Balance	$ 93,300
Assets, Total							$ 1,400,000