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Note 11 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred Tax Assets |  |
Loan loss allowance, due to differences in computation of bad debts | $ 37,157 | $ 51,192
Share-based compensation | 2,630 | 4,729
Accrual for bonuses | 630 | 6,095
Non-accrual interest | 2,100 | 4,246
Write-down on equity securities and venture capital investments | 2,561 | 4,437
Depreciation and amortization | 1,564 | 8,334
State tax | 6,783 | 6,426
Unrealized loss on interest rate swaps | 1,158 | 1,763
Unrealized loss on securities available-for-sale, net |  | 1,121
Investment in affordable housing partnerships | 580 |
Basis difference in acquired assets | 1,676 |
Tax credits carried forward | 9,278 |
Net operating loss carried forward | 18,375 |
Other, net | 3,279 | 3,598
Gross deferred tax assets | 87,771 | 91,941
Deferred Tax Liabilities |  |
Deferred loan costs | (7,655) | (8,695)
Investment in affordable housing partnerships |  | (2,659)
Basis difference in acquired assets |  | (4,841)
Dividends on Federal Home Loan Bank common stock | (1,021) | (1,322)
Other, net | (3,758) | (3,228)
Gross deferred tax liabilities | (12,434) | (20,745)
Net deferred tax assets | $ 75,337 | $ 71,196

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