Note 5 - Goodwill and Core Deposit Intangibles - Carrying Value of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Balance at beginning of period	$ 12,513	$ 12,513	$ 12,513	$ 12,513	$ 12,513
Goodwill acquired	124,016	0	124,016	0
Recast adjustments	0	0	0	0
Impairment	0	0	0	0	0
Balance at end of period	$ 136,529	$ 12,513	$ 136,529	$ 12,513	$ 12,513