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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets    
Allowance for loan losses $ 6,106 $ 5,595
Deferred compensation 1,143 1,213
Pension costs   56
Intangible assets 154 231
Net operating loss carryforward 699  
Deferred loan fees 347 614
Unrealized gain on securities available for sale 14,218  
Unrealized gain on securities purchased 1,966 258
Other 295 455
Deferred tax asset 24,928 8,422
Deferred tax liabilities    
Tax depreciation in excess of book depreciation (2,124) (973)
Discount accretion on securities (244) (86)
FHLB stock dividends (822) (969)
Purchase accounting adjustments (2,220)  
Unrealized gain on securities available for sale   (3,806)
Prepaids (334) (276)
Other (735) (1,243)
Deferred tax liability (6,479) (7,353)
Net deferred tax asset $ 18,449 $ 1,069