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Income Taxes (Net Deferred Tax Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Abstract]    
Allowance for loan losses $ 11,938 $ 10,452
Deferred compensation 1,357 972
Investment in limited partnerships 943 954
SERP agreements 682 767
Interest on nonaccrual loans 453 615
Benefit of tax credit carryforwards   502
Share-based compensation 604 538
Net unrealized loss on securities available for sale 2,326 420
Other 120 328
Gross deferred tax assets 18,423 15,548
Prepaid pension costs 4,727 5,065
Intangible assets 4,059 2,667
Depreciation and amortization 1,085 1,004
Loan servicing assets 415 479
Other 234  
Gross deferred tax liabilities 10,520 9,215
Net deferred tax asset $ 7,903 $ 6,333