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Federal Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred Tax Assets:    
Allowance for loan losses $ 1,444 $ 1,464
Other 505 399
Net unrealized loss on available-for-sale securities 802 581
Total deferred tax assets 2,751 2,444
Deferred Tax Liabilities:    
Accreted discounts on bonds 29 55
FHLB stock dividends 462 462
Mortgage servicing rights 508 490
Other 1,751 1,185
Total deferred tax liabilities 2,750 2,192
Net Deferred Tax Asset $ 1 $ 252