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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