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Income Taxes - Effective Income Tax Rate Reconciliation (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 - Effective Income Tax Rate Reconciliation (Details)
Taxes at federal statutory rate									$ 11,200	$ 13,752	$ 23,147
Taxes at federal statutory rate, percentage									21.00%	21.00%	35.00%
State and local income tax, net of Federal income tax benefit									$ 1,274	$ 1,439	$ 1,410
State and local income tax, net of Federal income tax benefit, percentage									2.40%	2.20%	2.10%
TCJA											$ 3,770
TCJA, percentage											5.70%
Tax exempt									$ (878)	$ (1,961)	$ (2,429)
Tax exempt, percentage									(1.60%)	(3.00%)	(3.70%)
Other									$ 456	$ (2,835)	$ (885)
Other, percentage									0.90%	(4.30%)	(1.30%)
Total provision for income taxes	$ 3,957	$ 2,536	$ 3,272	$ 2,287	$ 1,046	$ 1,910	$ 4,489	$ 2,950	$ 12,052	$ 10,395	$ 25,013
Taxes at effective rate, percentage									22.70%	15.90%	37.80%

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