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Income taxes - Components of Net Deferred Tax Asset (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Allowance for loan losses | $ 4,490 | $ 3,981
Defined benefit plan | 1,516 | 1,392
Deferred compensation | 593 | 499
Deferred loan fees | 470 | 264
Investment securities available-for-sale | 683 | 260
Other | 116 | 106
Total | 7,868 | 6,502
Deferred tax liabilities: |  |
Premises and equipment, net | 985 | 815
Merger related accounting | 1,083 | 1,243
Deferred loan costs | 626 | 531
Other | 93 | 7
Total | 2,787 | 2,596
Net deferred tax asset | $ 5,081 | $ 3,906

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