Note 1 - Nature of Operations - Summary of Significant Accounting Policies - (Details Textual) - USD ($)				12 Months Ended
	Jan. 01, 2023	Mar. 01, 2022	May 01, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Feb. 28, 2022	Mar. 31, 2021	Mar. 22, 2021
Assets, Total				$ 5,990,460,000	$ 4,726,378,000
Loans and Leases Receivable, Net of Deferred Income				4,606,176,000	3,189,608,000
Deposits, Total				4,820,345,000	4,077,283,000
Liabilities, Total				5,409,979,000	4,293,010,000
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				3,949,000	2,712,000	$ 1,605,000
Retained Earnings (Accumulated Deficit), Total				163,955,000	121,874,000
Deferred Income Tax Assets, Net				$ 31,194,000	$ 8,822,000
Subsequent Event [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease), Total	$ 2,700,000
Unfunded Commitments Liability, Increase	3,200,000
Retained Earnings (Accumulated Deficit), Total	(1,000,000.0)
Deferred Income Tax Assets, Net	221,000
Subsequent Event [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable, Allowance for Credit Loss, Implementation Gross-Up	$ 4,800,000
Smith Shellnut Wilson, LLC [Member]
Assets, Total								$ 3,600,000
Assets under Management, Carrying Amount									$ 3,500,000,000
Liabilities, Total								$ 2,300,000
Texas Citizens Bancorp [Member]
Assets, Total		$ 534,200,000					$ 534,200,000
Loans and Leases Receivable, Net of Deferred Income		349,500,000					349,500,000
Deposits, Total		$ 477,200,000					$ 477,200,000
Pedestal [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)			7,614,506
Assets, Total			$ 1,400,000,000
Loans and Leases Receivable, Net of Deferred Income			935,800,000
Deposits, Total			$ 1,200,000,000
Texas Citizens Bancorp [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)		2,069,532