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Income Taxes (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Deferred tax assets: |  |  |
Allowance for loan and lease losses | $ 13,737 | $ 12,411 | $ 11,276
Interest income on nonperforming loans | 214 | 1,207 | 395
Compensation and benefits | 14,504 | 14,032 | 13,081
Purchase accounting adjustments | 527 | 1,920 | 3,538
Liabilities held at fair value | 1 | 218 | 364
Tax credit carryforward | 0 | 831 | 1,995
Other | 3,088 | 2,546 | 2,347
Total | 32,071 | 33,165 | 32,996
Deferred tax liabilities: |  |  |
Prepaid pension | 11,439 | 10,992 | 9,377
Depreciation | 3,006 | 3,277 | 2,553
Intangibles | 882 | 567 | 236
Other | 2,901 | 2,144 | 1,741
Total deferred tax liabilities | 18,228 | 16,980 | 13,907
Net deferred tax asset at year-end | 13,843 | 16,185 | 19,089
Net deferred tax asset at beginning of year | 16,185 | 19,089 | 24,120
Decrease in net deferred tax asset | (2,342) | (2,904) | (5,031)
Deferred Tax Asset, Purchase Accounting Adjustments | (483) | 0 | 0
Deferred tax expense | $ 1,859 | $ 2,904 | $ 5,031

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