Fair Value of Financial Instruments - Summary of Carrying Values and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Financial assets
Equity investments		$ 10,389	$ 10,079
Investment securities		47,495	48,998
Loans receivable		1,260,594	1,160,855
Carrying Amount [Member]
Financial assets
Cash, cash equivalents and federal funds sold(1)	[1]	103,884	67,821
Equity investments		10,389	10,079
Investment securities		47,495	48,998
Loans receivable		1,193,617	1,114,762
Accrued interest receivable	[2]	10,643	8,662
Financial liabilities
Funds borrowed	[3]	1,295,794	1,169,593
Accrued interest payable	[2]	4,497	4,398
Fair Value Recurring [Member]
Financial assets
Cash, cash equivalents and federal funds sold(1)	[1]	103,884	67,821
Equity investments		10,389	10,079
Investment securities		47,495	48,998
Loans receivable		1,193,617	1,114,762
Accrued interest receivable	[2]	10,643	8,662
Financial liabilities
Funds borrowed	[3]	1,295,727	1,171,274
Accrued interest payable	[2]	$ 4,497	$ 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 June 30, 2020 and December 31, 2019, publicly traded retail notes traded at a discount to par of $67 and a premium to par of $1,681, respectively.