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Income taxes - Components of Net Deferred Tax Asset (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Allowance for loan losses | $ 4,762 | $ 4,490
Lease liability | 1,301 |
Defined benefit plan | 815 | 1,516
Deferred compensation | 682 | 593
Deferred loan fees | 525 | 470
Investment securities available-for-sale |  | 683
Other | 137 | 116
Total | 8,222 | 7,868
Deferred tax liabilities: |  |
Lease right-of-use assets | 1,286 |
Premises and equipment, net | 1,350 | 985
Merger related accounting | 850 | 1,083
Deferred loan costs | 716 | 626
Investment securities available-for-sale | 416 |
Other | 242 | 93
Total | 4,860 | 2,787
Net deferred tax asset | $ 3,362 | $ 5,081

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