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INCOME TAXES - Components of Net Deferred Tax Asset (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Deferred tax assets:    
Allowance for loan losses $ 4,726 $ 4,725
Deferred compensation 553 545
Retirement plans and salary continuation 2,055 1,942
Share-based compensation 851 583
Off-balance sheet reserves 368 313
Nonaccrual loan interest 462 370
Net unrealized losses on securities available for sale 0 600
Goodwill 70 92
Bonus accrual 405 236
Low-income housing credit carryforward 2,231 1,983
Alternative minimum tax credit carryforward 5,343 4,048
Net operating loss carryforward 0 2,520
Other 602 479
Total deferred tax assets 17,666 18,436
Deferred tax liabilities:    
Depreciation 786 771
Net unrealized gains on securities available for sale 815 0
Mortgage servicing rights 841 777
Purchase accounting adjustments 412 435
Other 198 195
Total deferred tax liabilities 3,052 2,178
Net deferred tax asset $ 14,614 $ 16,258