Note 17 - Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Balance, beginning of period	$ 760,432
Balance, end of period	794,368
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance, beginning of period	(115,648)	$ (7,657)
Net current period other comprehensive income	14,217	(49,659)
Balance, end of period	(101,431)	(57,316)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Balance, beginning of period	0	0
Net current period other comprehensive income	376	0
Balance, end of period	376	0
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance, beginning of period	112	(283)
Net current period other comprehensive income	0	0
Balance, end of period	112	(283)
AOCI Attributable to Parent [Member]
Balance, beginning of period	(115,536)	(7,940)
Net current period other comprehensive income	14,593	(49,659)
Balance, end of period	$ (100,943)	$ (57,599)