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Note 3 - Investment Securities (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Proceeds from Sale of Debt Securities, Available-for-sale | $ 117,200 | $ 293,800 |  |  |
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale | 734,485 | 296,721 | $ 447,773 |  |
Debt Securities, Available-for-sale, Realized Gain | 1,700 | 583 |  |  |
Debt Securities, Available-for-sale, Realized Loss | $ 0 | 372 |  |  |
Temporarily Impaired Securities As Percentage Of Investment Securities | 17.90% |  |  |  |
Percentage Of Unrealized Losses For Securities With Unrealized Losses For Less Than Twelve Months | 0.30% |  |  |  |
Percentage Of Unrealized Losses For Securities With Unrealized Losses For Greater Than Twelve Months | 2.10% |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | $ 1,459 | 1,740 |  |  |
Pledged Investment Securities | 22,700 | 20,100 |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance | 2,418,144 | 2,294,283 | 2,121,866 |  | $ 1,973,304
Equity Securities, FV-NI, Unrealized Gain (Loss), Total | (1,148) | 5,736 | (2,787) |  |
Equity Securities, FV-NI | 23,744 | 28,005 |  |  |
Retained Earnings [Member] |  |  |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance | $ 1,789,325 | $ 1,659,153 | $ 1,479,149 |  | $ 1,281,639
Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance |  |  |  | $ 8,600 |

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