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Income Taxes (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets      
Allowance for loan losses $ 1,665 $ 2,627 $ 2,377
Net deferred loan fees 63 98 104
Unrealized losses on available-for-sale securities 38
Other 165 361 757
Deferred Tax Assets, Gross 1,931 3,086 3,238
Deferred tax liabilities      
Depreciation (926) (1,385) (1,335)
Mortgage servicing rights (2,162) (2,930) (2,468)
Unrealized gains on available-for-sale securities (26) (335)
Purchase accounting adjustments (1,102) (1,659) (1,489)
Prepaids (169) (188) (285)
FHLB stock dividends (288) (466) (465)
Deferred Tax Liabilities, Gross (4,647) (6,654) (6,377)
Net deferred tax liability $ (2,716) $ (3,568) $ (3,139)