Fair Value of Financial Instruments - Summary of Carrying Values and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands		Mar. 31, 2022	Dec. 31, 2021		Mar. 31, 2021
Financial assets
Equity investments		$ 10,076	$ 9,726
Investment securities		47,075	44,772
Loans receivable		1,569,441	1,488,924
Carrying Amount [Member]
Financial assets
Cash, cash equivalents and federal funds sold	[1]		124,484		$ 138,794
Equity investments			9,726		10,076
Investment securities			44,772		47,075
Loans receivable			1,438,758		1,518,755
Accrued interest receivable	[2]		10,621		10,603
Equity securities, fair value	[3]		1,950		1,859
Financial liabilities
Funds borrowed			1,478,001		1,559,303
Accrued interest payable	[2]		3,395		3,068
Fair Value Recurring [Member]
Financial assets
Cash, cash equivalents and federal funds sold	[1]		124,484		138,794
Equity investments			9,726		10,076
Investment securities			44,772		47,075
Loans receivable			1,438,758		1,518,755
Accrued interest receivable	[2]		10,621		10,603
Equity securities, fair value		$ 1,859	1,950	[3]	1,859	[3]
Financial liabilities
Funds borrowed			1,478,001		1,559,303
Accrued interest payable	[2]		$ 3,395		$ 3,068

[1] Categorized as level 1 within the fair value hierarchy, excluding $1.3 million in interest bearing deposits categorized as level 2 as of March 31, 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.