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Note 5 - Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Available for sale securities | $ 672,344 | $ 596,999
US Treasury Securities [Member] |  |
Available for sale securities | 45,701 | 12,053
US Government Agencies Debt Securities [Member] |  |
Available for sale securities | 109,101 | 111,199
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available for sale securities | 181,697 | 150,195
US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale securities | 262,479 | 251,584
Corporate Debt Securities [Member] |  |
Available for sale securities | 73,366 | 71,968
Fair Value, Recurring [Member] |  |
Available for sale securities | 672,344 | 596,999
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 45,701 | 12,053
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available for sale securities | 626,643 | 584,946
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | US Treasury Securities [Member] |  |
Available for sale securities | 45,701 | 12,053
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 45,701 | 12,053
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |
Available for sale securities | 109,101 | 111,199
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available for sale securities | 109,101 | 111,199
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available for sale securities | 181,697 | 150,195
Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available for sale securities | 181,697 | 150,195
Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale securities | 262,479 | 251,584
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available for sale securities | 262,479 | 251,584
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Available for sale securities | 73,366 | 71,968
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available for sale securities | 0 | 0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available for sale securities | 73,366 | 71,968
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available for sale securities | $ 0 | $ 0

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