Note 16 - Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Balance, beginning of period			$ 760,432
Balance, end of period	$ 808,082		808,082
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance, beginning of period	(101,431)	$ (57,316)	(115,648)	$ (7,657)
Net current period other comprehensive income (loss)	(8,310)	(29,738)	5,907	(79,397)
Balance, end of period	(109,741)	(87,054)	(109,741)	(87,054)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Balance, beginning of period	376	0	0	0
Net current period other comprehensive income (loss)	1,837	0	2,213	0
Balance, end of period	2,213	0	2,213	0
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance, beginning of period	112	(283)	112	(283)
Net current period other comprehensive income (loss)	0	0	0	0
Balance, end of period	112	(283)	112	(283)
AOCI Attributable to Parent [Member]
Balance, beginning of period	(100,943)	(57,599)	(115,536)	(7,940)
Net current period other comprehensive income (loss)	(6,473)	(29,738)	8,120	(79,397)
Balance, end of period	$ (107,416)	$ (87,337)	$ (107,416)	$ (87,337)