Fair Value Measurements and Disclosure - Summary of Carrying Amounts and Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Financial Assets: (Carrying Amount)
Cash and cash equivalents	$ 143,001	$ 53,351
Securities available-for-sale at fair value	87,172	83,402
Securities held-to-maturity	197	201
Loans receivable, net	1,481,721	1,353,907
Restricted investments in bank stock	1,385	1,742
Accrued interest receivable	5,575	4,756
Financial Liabilities (Carrying Amount)
Deposits	1,572,898	1,347,730
Borrowings	0	10,000
Accrued interest payable	6,174	1,027
Financial Assets: (Fair Value)
Securities available-for-sale at fair value	87,172	83,402
Securities held-to-maturity	196	200
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member]
Financial Assets: (Fair Value)
Cash and cash equivalents	143,001	53,351
Securities available-for-sale at fair value	87,172	83,402
Securities held-to-maturity	196	200
Loans receivable, net	1,483,203	1,347,137
Restricted investments in bank stock	1,385	1,742
Accrued interest receivable	5,575	4,756
Financial Liabilities (Fair Value)
Deposits	1,469,087	1,225,087
Borrowings		10,000
Accrued interest payable	6,174	1,027
Fair Value, Inputs, Level 1 [Member]
Financial Assets: (Fair Value)
Cash and cash equivalents	143,001	53,351
Fair Value, Inputs, Level 2 [Member]
Financial Assets: (Fair Value)
Securities available-for-sale at fair value	85,071	81,341
Securities held-to-maturity	196	200
Restricted investments in bank stock	1,385	1,742
Accrued interest receivable	5,575	4,756
Financial Liabilities (Fair Value)
Deposits	1,469,087	1,225,087
Borrowings		10,000
Accrued interest payable	6,174	1,027
Fair Value, Inputs, Level 3 [Member]
Financial Assets: (Fair Value)
Securities available-for-sale at fair value	2,101	2,061
Loans receivable, net	$ 1,483,203	$ 1,347,137