Note 12 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Loan loss allowance, due to differences in computation of bad debts	$ 47,673	$ 43,895
Accrual for bonuses	2,591	4,935
Non-accrual interest	1,572	1,117
Write-down on equity securities and venture capital investments	1,975	2,000
State tax	6,251	4,691
Unrealized loss on interest rate swaps	0	1,394
Unrealized loss on securities available-for-sale, net	40,400	0
Tax credits carried forward	9,136	9,136
Net operating loss carried forward	5,916	8,732
Other, net	4,711	3,765
Gross deferred tax assets	120,225	79,665
Deferred loan costs	(10,025)	(9,936)
Depreciation and amortization	(2,856)	(3,150)
Unrealized gain on interest rate swaps	(1,364)	0
Unrealized gain on securities available-for-sale, net	0	(3,823)
OREO Installment Sale	0	(1,273)
Dividends on Federal Home Loan Bank common stock	(981)	(978)
Other, net	(3,506)	(2,168)
Gross deferred tax liabilities	(18,732)	(21,328)
Net deferred tax assets	$ 101,493	$ 58,337