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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets    
Allowance for loan losses $ 5,256,000 $ 3,245,000
Deferred compensation 1,201,000 1,191,000
Pension costs 304,000 81,000
Intangible assets 312,000 394,000
Purchase accounting adjustments   226,000
Net operating loss carryforward 509,000 1,081,000
Deferred loan fees 1,260,000 102,000
Other 745,000 118,000
Deferred tax asset 9,587,000 6,438,000
Deferred tax liabilities    
Tax depreciation in excess of book depreciation (851,000) (808,000)
Discount accretion on securities (10,000) (18,000)
FHLB stock dividends (969,000) (969,000)
Unrealized gain on securities available for sale (5,606,000) (3,424,000)
Prepaids (325,000) (326,000)
Other (979,000) (359,000)
Deferred tax liability (8,740,000) (5,904,000)
Net deferred tax asset $ 847,000 $ 534,000