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Note 10 - Income Taxes - The Components of the Net Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Postretirement benefits $ 6,047 $ 7,800
Allowance for loan losses 6,414 9,518
Stock based compensation 2,808 3,525
Depreciation 1,057 2,135
Unrealized loss on securities available for sale 3,150 2,770
Fair value adjustment on financial assets carried at fair value 168
Fair value hedges 939 1,027
Adjustment required to recognize funded status of postretirement pension plans 2,068 3,246
Gain on sale of buildings 1,434 2,211
Other 299 2,434
Deferred tax assets 24,384 34,666
Deferred tax liabilities:    
FPFC deferred income 1,916
Cashflow hedges 129
Fair value adjustment on financial assets carried at fair value 150
Fair value adjustment on financial liabilities carried at fair value 7,800 11,943
Other 4,239 4,684
Deferred tax liabilities 14,084 16,777
Net deferred tax asset included in other assets $ 10,300 $ 17,889