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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:      
Allowance for loan and lease losses $ 9,577 $ 13,737 $ 12,411
Interest income on nonperforming loans 417 214 1,207
Compensation and benefits 10,406 14,504 14,032
Purchase accounting adjustments 0 527 1,920
Liabilities held at fair value 3 1 218
Tax credit carryforward 0 0 831
Other 2,515 3,088 2,546
Total 22,918 32,071 33,165
Deferred tax liabilities:      
Prepaid pension 8,140 11,439 10,992
Depreciation 2,686 3,006 3,277
Intangibles 776 882 567
Purchase accounting adjustments 194 0 0
Other 1,919 2,901 2,144
Total deferred tax liabilities 13,715 18,228 16,980
Net deferred tax asset at year-end 9,203 13,843 16,185
Net deferred tax asset at beginning of year 13,843 16,185 19,089
Decrease in net deferred tax asset (4,640) (2,342) (2,904)
Purchase accounting adjustments, net 0 (483) 0
Federal tax reform remeasurement of AOCI deferred tax asset 9,958 0 0
Deferred tax expense $ 14,598 $ 1,859 $ 2,904