Income Taxes - Schedule of Significant Components of Deferred Taxes (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets relating to:
Allowance for loan losses	$ 2,478	$ 414
Compensation differences	892	19
Reserve for loan sale buy backs	341
Acquisition accounting	255	591
Loan origination costs	81	153
Pass-through entities	252	173
Unrealized losses on swaps and securities available for sale	108
Other	191	341
Total deferred tax assets	4,598	1,691
Deferred tax liabilities relating to:
Premises and equipment	(1,532)	(1,473)
Core deposit and customer based intangible assets	(464)	(355)
Mortgage servicing rights	(1,488)
Unrealized gains on swaps and securities available for sale		(53)
Other	(25)	(561)
Total deferred tax liabilities	(3,509)	(2,442)
Net deferred tax asset, included in other assets	$ 1,089
Net deferred tax (liability), included in (liabilities)		$ (751)