Income Taxes - Net Deferred Tax Asset and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Allowance for loan losses	$ 735	$ 542
Deferred compensation	859	692
Accrued employee benefits	122	136
Carryforwards	3,492	4,743
Premises and equipment	6	11
ESOP release of shares	17
Other	57	14
Total deferred tax assets	5,288	6,138
Deferred tax liabilities:
Loan fees	48	82
Unrealized gain on available for sale securities	420	39
Mortgage servicing rights	491	589
FHLB stock dividends	26	28
Total deferred tax liabilities	985	738
Net deferred tax asset/liability	4,303	5,400
Valuation allowance	(934)
Total deferred tax assets	$ 3,369	$ 5,400