Fair Value of Financial Instruments - Summary of Carrying Values and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands		Sep. 30, 2022	Dec. 31, 2021
Financial assets
Equity investments		$ 10,670	$ 9,726
Investment securities		48,354	44,772
Loans receivable		1,855,510	1,488,924
Carrying Amount [Member]
Financial assets
Cash, cash equivalents and federal funds sold	[1]	98,202	124,484
Equity investments		10,670	9,726
Investment securities		48,354	44,772
Loans receivable		1,793,975	1,438,758
Accrued interest receivable	[2]	11,959	10,621
Equity securities, fair value	[3]	1,721	1,950
Financial liabilities
Funds borrowed		1,782,465	1,478,001
Accrued interest payable	[2]	3,432	3,395
Fair Value Recurring [Member]
Financial assets
Cash, cash equivalents and federal funds sold	[1]	98,202	124,484
Equity investments		10,670	9,726
Investment securities		48,354	44,772
Loans receivable		1,793,975	1,438,758
Accrued interest receivable	[2]	11,959	10,621
Equity securities, fair value	[3]	1,721	1,950
Financial liabilities
Funds borrowed		1,782,465	1,478,001
Accrued interest payable	[2]	$ 3,432	$ 3,395

[1] Categorized as level 1 within the fair value hierarchy, excluding $1.3 million in interest bearing deposits categorized as level 2 as of September 30, 2022 and December 31, 2021. See Note 13.

[2] Categorized as level 3 within the fair value hierarchy. See Note 13.

[3] Included within other assets on the balance sheet.