Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to bank owned life insurance expense.

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Note 15 - Income Taxes - Reconciliation of Statutory Federal Tax Rate and Effective Tax Rate From Continuing Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Federal income tax at the statutory rate, amount									$ 14,739	$ 13,281	$ 12,572
Federal income tax at the statutory rate									35.00%	35.00%	35.00%
State income tax, net of federal benefit, amount									$ 692	$ 598	$ 639
State income tax, net of federal benefit									1.64%	1.58%	1.78%
Total effective income tax rate reconciliation, amount									$ 15,431	$ 13,879	$ 13,211
Total effective income tax rate reconciliation									36.64%	36.58%	36.78%
Tax-exempt interest income, amount									$ (1,228)	$ (1,336)	$ (1,463)
Tax-exempt interest income									2.92%	3.52%	4.07%
Nondeductible goodwill, amount										$ 340
Nondeductible goodwill									0.00%	0.89%
Bank owned life insurance, amount									$ (478)	$ (335)	$ (690)
Bank owned life insurance									1.13%	0.88%	1.92%
Deferred tax revaluation, amount									$ 6,552
Deferred tax revaluation									15.56%	0.00%	0.00%
Other items, net, amount									$ 351	$ 271	$ 323
Other items, net									0.83%	0.71%	0.89%
Total income tax expense	$ 10,720	$ 3,894	$ 2,959	$ 3,055	$ 3,638	$ 3,230	$ 3,022	$ 2,929	$ 20,628	$ 12,819	$ 11,381
Income tax at the effective tax rate									48.98%	33.78%	31.68%