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Note 7 - Derivatives and Hedging Activities - Hedged Interest Rate Swaps and Non-hedged Interest Rate Swaps (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Derivative [Line Items] |  |
Swapped loan portfolio loan-to-value percentage, including the potential swap exposure | 65.00% |
Interest rate swap |  |
Derivative [Line Items] |  |
Interest rate swaps collateralized by investment securities | $ 224,930 | $ 98,555
Interest rate swap | Cash |  |
Derivative [Line Items] |  |
Interest rate swaps collateralized by investment securities | 45,719 |
Interest rate swap | U.S. govt. sponsored agency securities |  |
Derivative [Line Items] |  |
Interest rate swaps collateralized by investment securities | 3,628 | 3,541
Interest rate swap | Municipal securities |  |
Derivative [Line Items] |  |
Interest rate swaps collateralized by investment securities | 85,937 | 22,924
Interest rate swap | Residential mortgage-backed and related securities |  |
Derivative [Line Items] |  |
Interest rate swaps collateralized by investment securities | $ 89,646 | $ 72,090

X
- Definition Carrying value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are reported at carrying value and pledged to counterparties as collateral for financing transactions. + References No definition available. + Details
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- Definition For the Entity's swapped loan portfolio, this represents the maximum loan-to-value, including the potential swap exposure, percentage. + References No definition available. + Details
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