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Note 12 - Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Provision at federal statutory tax rate                         $ 2,588 $ 2,239 $ 3,589
State income tax-net of federal tax benefit                         121 100 91
Revaluation of net deferred tax asset due to change in federal income tax rate                         290
Tax-exempt interest income                         (379) (328) (507)
Bank-owned life insurance income                         (44) (67) (73)
Captive insurance net premiums                         (209) (195) (290)
Investment in tax credit entities                         (114) (272)
Other                         24 (83) 3
Totals $ 440 $ 537 $ 568 $ 442 $ 216 $ 530 $ 287 $ 361 $ 928 $ 825 $ 835 $ 515 $ 1,987 $ 1,394 $ 3,103
Effective tax rate                         16.10% 13.10% 29.40%