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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Operating activities |  |
Net income | $ 128,812,000 | $ 641,207,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Provisions for credit losses | 98,050,000 | (225,767,000)
Income tax expense | 37,356,000 | 203,525,000
Amortization of brokered deposit placement fee | 3,425,000 | 4,307,000
Amortization of Secured Borrowing Facility upfront fee | 569,000 | 773,000
Amortization of deferred loan origination costs and loan premium/(discounts), net | 4,455,000 | 4,016,000
Net amortization of discount on investments | 965,000 | 2,161,000
Reduction (increase) in tax indemnification receivable | (108,000) | 2,814,000
Depreciation of premises and equipment | 4,189,000 | 3,715,000
Acquired intangible assets amortization expense | 733,000 | 0
Stock-based compensation expense | 11,921,000 | 11,124,000
Unrealized (gains) losses on derivatives and hedging activities, net | 315,000 | 10,872,000
Gains on sales of loans, net | (9,881,000) | (399,111,000)
Acquisition transaction costs, net | 2,511,000 | 0
Other adjustments to net income, net | 7,235,000 | 2,578,000
Changes in operating assets and liabilities: |  |
Increase in accrued interest receivable | (185,294,000) | (183,168,000)
Increase in non-marketable securities | (992,000) | (317,000)
Decrease in other interest-earning assets | 328,000 | 19,282,000
Increase in other assets | (17,529,000) | (51,667,000)
Decrease in income taxes payable, net | (4,243,000) | (270,000)
Increase (decrease) in accrued interest payable | 14,779,000 | (9,081,000)
Increase (decrease) in other liabilities | (34,808,000) | 8,759,000
Total adjustments | (66,024,000) | (595,455,000)
Total net cash provided by operating activities | 62,788,000 | 45,752,000
Investing activities |  |
Loans acquired and originated | (2,215,958,000) | (2,076,635,000)
Net proceeds from sales of loans held for investment | 45,729,000 | 3,436,391,000
Proceeds from FFELP Loan claim payments | 5,594,000 | 4,602,000
Net decrease in loans held for investment (other than loan sales) | 1,153,297,000 | 1,021,353,000
Purchases of available-for-sale securities | (536,633,000) | (200,716,000)
Proceeds from sales and maturities of available-for-sale securities | 686,806,000 | 205,367,000
Purchase of subsidiary, net of cash acquired | (127,702,000) | 0
Total net cash (used in) provided by investing activities | (988,867,000) | 2,390,362,000
Financing activities |  |
Brokered deposit placement fee | (2,207,000) | 0
Net decrease in certificates of deposit | (127,815,000) | (686,344,000)
Net increase in other deposits | 543,767,000 | 850,408,000
Borrowings collateralized by loans in securitization trusts - repaid | (381,005,000) | (272,123,000)
Issuance costs for unsecured debt offering | (360,000) | (325,000)
Fees paid on Secured Borrowing Facility | 0 | (2,833,000)
Common stock dividends paid | (30,493,000) | (10,906,000)
Preferred stock dividends paid | (1,275,000) | (1,201,000)
Common stock repurchased | (169,322,000) | (550,790,000)
Total net cash used in financing activities | (168,710,000) | (674,114,000)
Net increase (decrease) in cash, cash equivalents and restricted cash | (1,094,789,000) | 1,762,000,000
Cash, cash equivalents and restricted cash at beginning of period | 4,545,344,000 | 4,609,709,000
Cash, cash equivalents and restricted cash at end of period | 3,450,555,000 | 6,371,709,000
Cash disbursements made for: |  |
Interest | 68,458,000 | 76,491,000
Income taxes paid | 5,066,000 | 887,000
Income taxes refunded | (916,000) | (1,049,000)
Reconciliation of the Consolidated Statements of Cash Flows to the Consolidated Balance Sheets: |  |
Cash and cash equivalents | 3,262,595,000 | 6,207,001,000
Restricted cash | 187,960,000 | 164,708,000
Total cash, cash equivalents and restricted cash | $ 3,450,555,000 | $ 6,371,709,000

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