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Income Taxes (Details 1) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Deferred tax assets |  |  |
Allowance for credit losses | $ 16,568 | $ 23,738 | $ 21,191
Deferred loan fees and costs | 6,741 | 10,728 | 9,724
Deferred rent | 1,009 | 1,483 | 1,364
Stock-based compensation | 847 | 3,037 | 2,068
Net operating loss | 2,032 | 2,695 | 2,946
Unrealized loss on securities available-for-sale | 1,312 | 1,303 |
Unrealized loss on interest rate swap derivatives |  | 284 |
SERP | 1,373 | 2,088 | 1,776
Premises and equipment | 33 | 3,838 | 3,381
Other | 35 | 477 | 383
Total deferred tax assets | 29,950 | 49,671 | 42,833
Deferred tax liabilities |  |  |
Unrealized gain on securities available for sale |  |  | (694)
Unrealized gain on interest rate swap derivatives | (578) |  |
Excess servicing | (99) | (191) | (157)
Intangible assets | (503) | (1,260) | (1,671)
Total deferred tax liabilities | (1,180) | (1,451) | (2,522)
Net deferred income tax amount | $ 28,770 | $ 48,220 | $ 40,311

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