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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred Tax Assets:    
Allowance for loan losses $ 3,128 $ 1,719
Deferred compensation 537 472
Net unrealized loss on available-for-sale securities   292
Other 142 32
Total deferred tax assets 3,807 2,515
Deferred Tax Liabilities:    
Accreted discounts on bonds 4 43
Depreciation 878 754
FHLB stock dividends 481 491
Intangible amortization 1,144 1,218
Mortgage servicing rights 725 586
Net unrealized gain on available-for-sale securities 1,514  
Prepaids 525 542
Other 5 235
Total deferred tax liabilities 5,276 3,869
Net Deferred Tax (Liability) $ (1,469) $ (1,354)