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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Deferred tax assets: |  |  |
Allowance for loan and lease losses | $ 10,676 | $ 9,577 | $ 13,737
Interest income on nonperforming loans | 384 | 417 | 214
Compensation and benefits | 10,885 | 10,406 | 14,504
Purchase accounting adjustments | 0 | 0 | 527
Liabilities held at fair value | 12 | 3 | 1
Other | 2,333 | 2,515 | 3,088
Deferred Tax Assets, Net of Valuation Allowance | 24,290 | 22,918 | 32,071
Total |  |  |
Prepaid pension | 8,700 | 8,140 | 11,439
Depreciation | 4,193 | 2,686 | 3,006
Intangibles | 971 | 776 | 882
Purchase accounting adjustments | 328 | 194 | 0
Leases | 1,790 | 1,145 | 1,687
Other | 1,459 | 774 | 1,214
Total deferred tax liabilities | 17,441 | 13,715 | 18,228
Net deferred tax asset at year-end | 6,849 | 9,203 | 13,843
Net deferred tax asset at beginning of year | 9,203 | 13,843 | 16,185
Decrease in net deferred tax asset | (2,354) | (4,640) | (2,342)
Purchase accounting adjustments, net | 0 | 0 | (483)
Federal tax reform remeasurement of AOCI deferred tax asset | 0 | 9,958 | 0
Deferred tax expense | $ 2,354 | $ 14,598 | $ 1,859

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