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INCOME TAXES - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Allowance for loan losses $ 2,919 $ 4,725
Deferred compensation 355 545
Retirement plans and salary continuation 1,301 1,942
Share-based compensation 597 583
Off-balance sheet reserves 207 313
Nonaccrual loan interest 258 370
Net unrealized losses on securities available for sale 0 600
Goodwill 39 92
Bonus accrual 25 236
Low-income housing credit carryforward 2,313 1,983
Alternative minimum tax credit carryforward 0 4,048
Net operating loss carryforward 0 2,520
Other 390 479
Total deferred tax assets 8,404 18,436
Deferred tax liabilities:    
Depreciation 488 771
Net unrealized gains on securities available for sale 757 0
Mortgage servicing rights 536 777
Purchase accounting adjustments 251 435
Other 122 195
Total deferred tax liabilities 2,154 2,178
Net deferred tax asset, included in Other Assets $ 6,250 $ 16,258