NOTE 2 - INVESTMENT SECURITIES (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) state item	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) state item	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) state item
Number of securities | item	587		587
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions | item	69		69
Aggregate losses of securities (as a percent)	0.20%		0.20%
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | item	67		67
Other than temporary impairment losses, investments | $	$ 0	$ 0	$ 0	$ 0
Sale of securities | $		$ 0	$ 4,661	$ 0
Number Of Charters Owning Municipal Securities | item			5
Municipal Bonds | General Obligation Bonds
Number of issuers | item	101		101		110
Other investments | $	$ 81,000		$ 81,000		$ 86,400
Number of states holding investments | state	24		24		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	159		159		160
Other investments | $	$ 377,300		$ 377,300		$ 371,900
Number of states holding investments	19		19		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