NOTE 3 - INVESTMENT SECURITIES (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) state item	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) state item	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) state item
Number of securities | item	510		510
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions | item	31		31
Aggregate losses of securities (as a percent)	0.10%		0.10%
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | item	21		21
Other than temporary impairment losses, investments	$ 0	$ 0	$ 0	$ 0
Sale of securities	23,364	$ 1,938	28,025	$ 1,938
Gain on sale	$ 143		$ 150
Number Of Charters Owning Municipal Securities | item			4
Municipal Bonds | General Obligation Bonds
Number of issuers | item	91		91		110
Other investments	$ 76,100		$ 76,100		$ 86,400
Number of states holding investments | state	23		23		26
Municipal Bonds | General Obligation Bonds | Minimum
Other investments	$ 5,000		$ 5,000		$ 5,000
Municipal Bonds | General Obligation Bonds | Aggregate Fair Value Exceeding 5 Million [Member]
Number of states holding investments | state	6		6		6
Municipal Bonds | Revenue Bonds
Number of issuers | item	148		148		160
Other investments	$ 335,200		$ 335,200		$ 371,900
Number of states holding investments	17		17		19
Municipal Bonds | Revenue Bonds | Minimum
Other investments	$ 5,000		$ 5,000		$ 5,000
Municipal Bonds | Revenue Bonds | Aggregate Fair Value Exceeding 5 Million [Member]
Number of states holding investments	7		7		7