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Income Taxes - Income Tax Provisions (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, 2019	Dec. 31, 2018	Dec. 31, 2017
Note 10 - Income Taxes - Income Tax Provisions (Details)
Federal tax provision, current									$ 12,404	$ 9,183	$ 14,859
Federal tax provision, deferred									(1,965)	(609)	7,985
Total federal tax provision									10,439	8,574	22,844
State and local tax provision, current									3,543	3,876	1,419
State and local tax provision, deferred									(1,930)	(2,055)	750
Total state and local tax provision									1,613	1,821	2,169
Total income tax provision	$ 3,957	$ 2,536	$ 3,272	$ 2,287	$ 1,046	$ 1,910	$ 4,489	$ 2,950	$ 12,052	$ 10,395	$ 25,013

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