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Income taxes - Components of Net Deferred Tax Asset (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Allowance for loan losses | $ 5,742 | $ 4,762
Lease liability | 1,349 | 1,301
Defined benefit plan | 1,108 | 815
Deferred compensation | 789 | 682
Deferred loan fees | 1,368 | 525
Other | 170 | 137
Total | 10,526 | 8,222
Deferred tax liabilities: |  |
Lease right-of-use assets | 1,319 | 1,286
Premises and equipment, net | 1,455 | 1,350
Merger related accounting | 694 | 850
Deferred loan costs | 936 | 716
Investment securities available-for-sale | 2,033 | 416
Other | 321 | 242
Total | 6,758 | 4,860
Net deferred tax asset | $ 3,768 | $ 3,362

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