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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