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Income Taxes - Significant components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets |  |
Allowance for credit losses | $ 28,118 | $ 19,144
Deferred loan fees and costs | 8,104 | 6,354
Leases | 7,183 | 7,790
Stock-based compensation | 828 | 674
Net operating loss | 6,896 | 6,184
Unrealized loss on interest rate swap derivatives | 132 | 53
SERP | 2,495 | 1,541
Premises and equipment | 879 | 914
Other assets | 1,982 | 816
Valuation allowances | (5,845) | (4,899)
Total deferred tax assets | 50,772 | 38,571
Deferred tax liabilities |  |
Unrealized net gain on securities available-for-sale | (5,519) | (1,081)
Excess servicing | (206) | (51)
Intangible assets | 0 | (9)
Leases | (6,470) | (7,117)
Other liabilities | (6) | (509)
Total deferred tax liabilities | (12,201) | (8,767)
Net deferred income tax assets | $ 38,571 | $ 29,804

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