NOTE 4 - DERIVATIVES AND HEDGING ACTIVITIES - Hedged Interest Rate Swaps and Non-hedged Interest Rate Swaps (Details) - Interest rate swap - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Interest rate swaps collateralized by investment securities	$ 241,384	$ 109,647
Cash
Derivative [Line Items]
Interest rate swaps collateralized by investment securities	81,373	10,990
U.S. govt. sponsored agency securities
Derivative [Line Items]
Interest rate swaps collateralized by investment securities	3,650	3,541
Municipal securities
Derivative [Line Items]
Interest rate swaps collateralized by investment securities	50,730	68,089
Residential mortgage-backed and related securities
Derivative [Line Items]
Interest rate swaps collateralized by investment securities	$ 105,631	$ 27,027