Note 20 - Segments - Financial Information by Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Net interest income	$ 41,584		$ 33,528		$ 79,409	$ 65,974
Provision for credit losses	4,147		7,025		2,672	12,950
Non-interest income	6,858		5,726		13,106	11,944
All other non-interest income	8,930		6,896		16,526	13,214
Non-interest expenses	48,177		23,409		73,150	46,984
Income before income tax expense	5,048		15,716		33,219	31,198
Income tax expense	864		2,348		6,325	4,598
Net income	4,184	$ 22,710	13,368	$ 13,232	26,894	26,600
Segment assets	6,088,072		4,334,533		6,088,072	4,334,533	$ 4,608,629
Commercial Banking [Member]
Net interest income	41,516		33,443		79,258	65,804
Provision for credit losses	4,147		7,025		2,672	12,950
Non-interest income	0		0		0	0
All other non-interest income	8,930		6,896		16,526	13,214
Non-interest expenses	44,481		20,288		66,177	40,551
Income before income tax expense	1,818		13,026		26,935	25,517
Income tax expense	190		1,764		4,988	3,365
Net income	1,628		11,262		21,947	22,152
Segment assets	6,084,185		4,330,893		6,084,185	4,330,893
Investment Management and Trust [Member]
Net interest income	68		85		151	170
Provision for credit losses	0		0		0	0
Non-interest income	6,858		5,726		13,106	11,944
All other non-interest income	0		0		0	0
Non-interest expenses	3,696		3,121		6,973	6,433
Income before income tax expense	3,230		2,690		6,284	5,681
Income tax expense	674		584		1,337	1,233
Net income	2,556		2,106		4,947	4,448
Segment assets	$ 3,887		$ 3,640		$ 3,887	$ 3,640