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Note 11 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred Tax Assets |  |
Loan loss allowance, due to differences in computation of bad debts | $ 37,567 | $ 37,157
Share-based compensation | 3,260 | 2,630
Non-accrual interest | 2,277 | 2,100
Write-down on equity securities and venture capital investments | 2,095 | 2,561
Depreciation and amortization | 3,798 | 1,564
State tax | 4,344 | 6,783
Unrealized loss on interest rate swaps | 190 | 1,158
Unrealized loss on securities available-for-sale, net | 3,864 | 198
Unrealized loss on equity securities | 843 |
Basis difference in acquired assets | 622 | 1,676
Tax credits carried forward | 9,473 | 9,278
Net operating loss carried forward | 17,163 | 18,375
Other, net | 4,095 | 4,291
Gross deferred tax assets | 89,591 | 87,771
Deferred Tax Liabilities |  |
Deferred loan costs | (8,839) | (7,655)
Dividends on Federal Home Loan Bank common stock | (956) | (1,021)
Other, net | (4,008) | (3,758)
Gross deferred tax liabilities | (13,803) | (12,434)
Net deferred tax assets | $ 75,788 | $ 75,337

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