Note 2 - INVESTMENT SECURITIES (Details) $ in Thousands	3 Months Ended
Mar. 31, 2023 USD ($) item issuer state security	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) issuer state
Number of securities \| security	646
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions \| item	524
Aggregate losses of securities (as a percent)	10.20%
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year \| item	276
Gain on sale	$ 44
Number Of Charters Owning Municipal Securities \| item	4
Debt Securities, Available-for-Sale, Allowance for Credit Loss	$ 989
Provision for credit losses	$ 3,928	$ (2,916)
Revenue Bonds
Number of issuers \| issuer	2		2
Percentage threshold	5.00%		5.00%
Municipal securities \| General Obligation Bonds
Number of issuers \| issuer	85		118
Other investments	$ 91,800		$ 110,600
Number of states holding investments \| state	18		22
Municipal securities \| General Obligation Bonds \| Minimum
Other investments	$ 5,000		$ 5,000
Municipal securities \| General Obligation Bonds \| Aggregate Fair Value Exceeding 5 Million
Number of states holding investments \| state	7		7
Municipal securities \| Revenue Bonds
Number of issuers \| issuer	169		181
Other investments	$ 606,700		$ 617,200
Number of states holding investments \| state	29		29
Municipal securities \| Revenue Bonds \| Minimum
Other investments	$ 5,000		$ 5,000
Municipal securities \| Revenue Bonds \| Aggregate Fair Value Exceeding 5 Million
Number of states holding investments \| state	12		12

The aggregate depreciation from amortized cost basis as a percent.

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The number of the company's that own the company's municipal securities.

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Number of issuers of debt securities.

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Number of securities.

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Represents the number of states investments are held in.

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Percentage threshold of stockholders' equity which general obligation or revenue bonds market value of any single issuer does not exceed.

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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