Note 14 - Federal and State Income Taxes - Reconciliation of the Expected Federal Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Federal and State Income Taxes
Computed "expected" tax expense	$ 25,508	$ 15,391	$ 15,126
Tax exempt income, net	(7,537)	(5,943)	(4,470)
Bank-owned life insurance	(386)	(308)	(360)
State income taxes, net of federal benefit, current year	5,089	3,622	3,668
Change in unrecognized tax benefits	578	546	(93)
Goodwill impairment		105	630
Intended liquidation of bank-owned life insurance			790
Tax credits	34
Tax Credits		(456)	(705)
Acquisition costs	95
Excess tax benefit on stock options exercised and restricted stock awards vested	(436)	(242)	(287)
Re-measurement of deferred tax asset to incorporate newly enacted tax rates		207
Other	(383)	(215)	320
Federal and state income tax expense	$ 22,562	$ 12,707	$ 14,619
Computed "expected" tax expense (in percentage)	21.00%	21.00%	21.00%
Tax exempt income, net (in percentage)	(6.20%)	(8.10%)	(6.20%)
Bank-owned life insurance (in percentage)	(0.30%)	(0.40%)	(0.50%)
State income taxes, net of federal benefit, current year (in percentage)	4.20%	4.90%	5.10%
Change in unrecognized tax benefits (in percentage)	0.50%	0.70%	(0.10%)
Goodwill impairment (in percentage)		0.10%	0.90%
Intended liquidation of bank-owned life insurance (in percentage)			1.10%
Tax credits (in percentage)		(0.60%)	(1.00%)
Acquisition costs (in percentage)	0.10%
Excess tax benefit on stock options exercised and restricted stock awards vested (in percentage)	(0.40%)	(0.30%)	(0.40%)
Re-measurement of deferred tax asset to incorporate newly enacted tax rates (in percentage)		0.30%
Other (in percentage)	(0.30%)	(0.30%)	0.40%
Federal and state income tax expense (in percentage)	18.60%	17.30%	20.30%