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Income Taxes - Significant components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets |  |
Allowance for credit losses | $ 19,736 | $ 28,118
Deferred loan fees and costs | 6,559 | 8,104
Leases | 9,283 | 7,183
Stock-based compensation | 1,132 | 828
Net operating loss | 7,623 | 6,896
Unrealized loss on securities available-for-sale | 4,900 | 0
Unrealized loss on interest rate swap derivatives | 0 | 132
SERP | 5,631 | 2,495
Premises and equipment | 1,328 | 879
Other assets | 2,098 | 1,982
Valuation allowances | (6,724) | (5,845)
Total deferred tax assets | 51,566 | 50,772
Deferred tax liabilities |  |
Unrealized net gain on securities available-for-sale | 0 | (5,519)
Excess servicing | (402) | (206)
Intangible assets | 0 | 0
Leases | (7,990) | (6,470)
Other liabilities | 0 | (6)
Total deferred tax liabilities | (8,392) | (12,201)
Net deferred income tax assets | $ 43,174 | $ 38,571

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