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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred Tax Assets, Gross [Abstract]    
Allowance for credit losses $ 10,223 $ 17,616
Postretirement benefits other than pensions 345 611
Alternative minimum tax credit carryforward 201 0
Unrealized loss on securities available for sale 2,091 3,905
Deferred Tax Assets, Operating Loss Carryforwards 6,145 0
Writedown of other real estate owned 878 1,266
Deferred compensation 1,514 1,966
Accrued interest on nonaccrual loans 1,017 1,701
Accrued incentives 1,277 2,627
Unfunded loan commitments & other reserves 1,098 1,452
Deferred rent 801 1,285
Other 1,224 1,966
Total deferred tax assets 26,814 34,395
Deferred tax liabilities:    
Income from unconsolidated subsidiary (380) (623)
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (587) (28)
Other (338) (429)
Total deferred tax liabilities (1,305) (1,080)
Net deferred tax asset $ 25,509 $ 33,315