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Note 1 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands	Mar. 31, 2022 USD ($) subsidiary	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Retained earnings	$ 405,762	$ 386,077
Less allowance	74,786	78,721	$ 81,831	$ 84,376
Debt Securities, Held-to-maturity, Allowance for Credit Loss	$ 198		174
Number of subsidiaries commercial banks \| subsidiary	4
Accounting Standards Update 2016-13
Less allowance			(8,102)
Debt Securities, Held-to-maturity, Allowance for Credit Loss			183
Commercial Portfolio Segment [Member]
Less allowance	$ 29,056	$ 29,889		$ 35,421
Commercial Portfolio Segment [Member] \| Accounting Standards Update 2016-13
Less allowance			$ (35,421)

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

The cumulative amount of the reporting entity's undistributed earnings or deficit.