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NOTE 4 - DERIVATIVES AND HEDGING ACTIVITIES - Hedged Interest Rate Swaps and Non-hedged Interest Rate Swaps (Details) - Interest rate swap - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative [Line Items] |  |
Interest rate swaps collateralized by investment securities | $ 232,960 | $ 109,647
Cash |  |
Derivative [Line Items] |  |
Interest rate swaps collateralized by investment securities | 80,250 | 10,990
U.S. govt. sponsored agency securities |  |
Derivative [Line Items] |  |
Interest rate swaps collateralized by investment securities | 3,657 | 3,541
Municipal securities |  |
Derivative [Line Items] |  |
Interest rate swaps collateralized by investment securities | 41,863 | 68,089
Residential mortgage-backed and related securities |  |
Derivative [Line Items] |  |
Interest rate swaps collateralized by investment securities | $ 107,190 | $ 27,027

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