Fair Value of Financial Instruments - Summary of Carrying Values and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands		Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Financial assets
Equity investments		$ 11,404	$ 10,293
Investment securities		53,692	48,492
Loans receivable		2,156,998	1,916,953	$ 1,734,621
Carrying Amount [Member]
Financial assets
Cash, cash equivalents and federal funds sold	[1]	124,554	105,598
Equity investments		11,404	10,293
Investment securities		53,692	48,492
Loans receivable		2,082,027	1,853,108
Accrued interest receivable	[2]	13,345	12,613
Equity securities, fair value	[3]	1,724	1,724
Financial liabilities
Funds borrowed		2,066,607	1,833,484
Accrued interest payable	[2]	4,449	4,790
Fair Value Recurring [Member]
Financial assets
Cash, cash equivalents and federal funds sold	[1]	124,554	105,598
Equity investments		11,404	10,293
Investment securities		53,692	48,492
Loans receivable		2,082,027	1,853,108
Accrued interest receivable	[2]	13,345	12,613
Equity securities, fair value	[3]	1,724	1,724
Financial liabilities
Funds borrowed		2,066,607	1,833,484
Accrued interest payable	[2]	$ 4,449	$ 4,790

[1] Categorized as level 1 within the fair value hierarchy, excluding $1.3 million in interest bearing deposits categorized as level 2 as of June 30, 2023 and $1.3 million as of December 31, 2022. 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.