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Note 2 - Investment Securities - Interest Income From Investment Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Taxable $ 93,163 $ 77,800 $ 65,330
Tax-exempt from regular federal income tax 12,151 15,736 19,438
Total interest income from investment securities $ 105,314 $ 93,536 $ 84,768