CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets
Cash and cash equivalents	$ 7,292,929	$ 5,563,877
Investments [Abstract]
Trading investments at fair value (cost of $12,551)	11,360	0
Available-for-sale investments at fair value (cost of $607,867 and $485,756, respectively)	614,582	487,669
Other investments	82,853	84,420
Total investments	708,795	572,089
Loans held for investment (net of allowance for losses of $1,673,324 and $441,912, respectively)	21,695,851	24,667,792
Restricted cash	189,439	156,883
Other interest-earning assets	92,968	52,564
Accrued interest receivable	1,281,746	1,392,725
Premises and equipment, net	143,622	134,749
Income taxes receivable, net	286,006	88,844
Tax indemnification receivable	27,727	27,558
Other assets	41,812	29,398
Total assets	31,760,895	32,686,479
Liabilities
Deposits	24,445,614	24,283,983
Short-term borrowings	0	289,230
Long-term borrowings	4,708,036	4,354,037
Upromise member accounts	187,103	192,662
Other liabilities	299,559	254,731
Total liabilities	29,640,312	29,374,643
Commitments and contingencies
Equity
Series B: 4 million and 4 million shares issued, respectively, at stated value of $100 per share	400,000	400,000
Common stock, par value $0.20 per share, 1.125 billion shares authorized: 456.4 million and 453.6 million shares issued, respectively	91,288	90,720
Additional paid-in capital	1,226,886	1,307,630
Accumulated other comprehensive income (loss) (net of tax expense (benefit) of ($13,979) and ($3,995), respectively)	(43,274)	(12,367)
Retained earnings	1,243,722	1,850,512
Total SLM Corporation stockholders’ equity before treasury stock	2,918,622	3,636,495
Less: Common stock held in treasury at cost: 81.3 million and 32.5 million shares, respectively	(798,039)	(324,659)
Total equity	2,120,583	3,311,836
Total liabilities and equity	$ 31,760,895	$ 32,686,479