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Note 7 - Derivatives and Hedging Activities - Hedged Interest Rate Swaps and Non-hedged Interest Rate Swaps (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative [Line Items] |  |
Interest rate swaps are collateralized by investment securities | $ 113,300 | $ 100,900
Interest rate swap |  |
Derivative [Line Items] |  |
Interest rate swaps are collateralized by investment securities | 98,555 |
Interest rate swap | U.S. govt. sponsored agency securities |  |
Derivative [Line Items] |  |
Interest rate swaps are collateralized by investment securities | 3,541 |
Interest rate swap | Municipal securities |  |
Derivative [Line Items] |  |
Interest rate swaps are collateralized by investment securities | 22,924 |
Interest rate swap | Residential mortgage-backed and related securities |  |
Derivative [Line Items] |  |
Interest rate swaps are collateralized by investment securities | 72,090 |
Collateral Pledged | Interest rate swap |  |
Derivative [Line Items] |  |
Restricted cash | $ 10,000 | $ 18,500

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