Fair Value of Financial Instruments - Summary of Carrying Values and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Financial assets
Equity investments		$ 10,284	$ 10,079
Investment securities		45,991	48,998
Loans receivable		1,281,054	1,160,855
Carrying Amount [Member]
Financial assets
Cash, cash equivalents and federal funds sold(1)	[1]	49,731	67,821
Equity investments		10,284	10,079
Investment securities		45,991	48,998
Loans receivable		1,190,544	1,114,762
Accrued interest receivable	[2]	10,590	8,662
Financial liabilities
Funds borrowed	[3]	1,271,185	1,169,593
Accrued interest payable	[2]	3,784	4,398
Fair Value Recurring [Member]
Financial assets
Cash, cash equivalents and federal funds sold(1)	[1]	49,731	67,821
Equity investments		10,284	10,079
Investment securities		45,991	48,998
Loans receivable		1,190,544	1,114,762
Accrued interest receivable	[2]	10,590	8,662
Financial liabilities
Funds borrowed	[3]	1,271,104	1,171,274
Accrued interest payable	[2]	$ 3,784	$ 4,398

[1] Categorized as level 1 within the fair value hierarchy. See Note 13.

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

[3] As of September 30, 2020 and December 31, 2019, publicly traded retail notes traded at a discount to par of $81 and a premium to par of $1,681, respectively.