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Note 13 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Allowance for loan and lease losses $ 1,210 $ 2,243
Supplemental retirement plan 528 382
Investment security basis adjustment 18 66
Nonaccrual interest income 371 456
OREO adjustments 2 26
Accrued compensation 201 261
Other 86 82
Gross deferred tax assets 2,416 3,516
Deferred tax liabilities:    
Premises and equipment 356 445
Net unrealized gain on securities 347 618
FHLB stock dividends 139 225
Intangibles 307 449
Mortgage servicing rights 71 103
Deferred origination fees, net 294 63
Acquisition fair value adjustments 250 1
Other 5 5
Gross deferred tax liabilities 1,769 1,909
Net deferred tax assets $ 647 $ 1,607