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Parent Only Statements - Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash flows from operating activities: |  |  |
Net income | $ 581,391 | $ 469,014 | $ 1,160,513
Adjustments to reconcile net income to net cash (used in) provided by operating activities: |  |  |
Reduction of tax indemnification receivable | 2,816 | 5,231 | 10,445
Amortization of unsecured debt upfront fees | 2,869 | 2,634 | 2,415
Amortization of discount on unsecured borrowings | 571 | 571 | 0
Acquisition related costs | 952 | 2,603 | 0
Increase in other assets | (38,902) | (23,472) | (123,268)
Increase (decrease) in other liabilities | (27,807) | (6,473) | 2,801
Total adjustments | (726,028) | (464,022) | (1,210,035)
Total net cash (used in) provided by operating activities | (144,637) | 4,992 | (49,522)
Cash flows from investing activities: |  |  |
Purchase of subsidiary, net of cash acquired | (14,654) | (127,654) | 0
Total net cash (used in) provided by investing activities | (12,460) | 1,077,392 | 2,604,673
Cash flows from financing activities: |  |  |
Unsecured debt issued | 0 | 0 | 492,135
Unsecured debt repaid | 0 | 0 | (202,784)
Common stock dividends paid | (101,233) | (112,961) | (60,462)
Common stock repurchased | (350,264) | (713,197) | (1,530,683)
Net cash used in financing activities | (316,232) | (854,892) | (2,619,516)
Net increase (decrease) in cash, cash equivalents and restricted cash | (473,329) | 227,492 | (64,365)
Cash and cash equivalents at beginning of year | 4,616,117 | 4,334,603 |
Cash and cash equivalents at end of year | 4,149,838 | 4,616,117 | 4,334,603
Parent Company |  |  |
Cash flows from operating activities: |  |  |
Net income | 581,391 | 469,014 | 1,160,513
Adjustments to reconcile net income to net cash (used in) provided by operating activities: |  |  |
Undistributed earnings of subsidiaries | (669,624) | (555,022) | (1,271,236)
Dividends received from Sallie Mae Bank | 550,000 | 699,500 | 1,444,500
Reduction of tax indemnification receivable | 2,816 | 5,231 | 10,445
Amortization of unsecured debt upfront fees | 2,643 | 2,651 | 2,663
Loss on early extinguishment of unsecured debt | 0 | 0 | 2,784
(Increase) decrease in investment in subsidiaries, net | 35,654 | (9,179) | 34,935
(Increase) decrease in due from subsidiaries, net | 36,864 | 5,124 | (58,310)
Increase in other assets | (13,422) | (20,533) | (16,964)
Increase (decrease) in income taxes payable, net | 490 | (8,713) | 36,657
Decrease in payable due to entity that is a subsidiary of Navient | 0 | (101) | (8,430)
Increase (decrease) in other liabilities | (3,442) | (1,836) | 2,165
Total adjustments | (56,498) | 120,296 | 179,209
Total net cash (used in) provided by operating activities | 524,893 | 589,310 | 1,339,722
Cash flows from investing activities: |  |  |
Total net cash (used in) provided by investing activities | (14,654) | (127,654) | 0
Cash flows from financing activities: |  |  |
Issuance costs for unsecured debt offering | 0 | (375) | (1,540)
Unsecured debt issued | 0 | 0 | 492,135
Unsecured debt repaid | 0 | 0 | (202,784)
Common stock dividends paid | (101,233) | (112,961) | (60,462)
Preferred stock dividends paid | (17,705) | (9,029) | (4,736)
Common stock repurchased | (350,264) | (713,197) | (1,530,683)
Net cash used in financing activities | (469,202) | (835,562) | (1,308,070)
Net increase (decrease) in cash, cash equivalents and restricted cash | 41,037 | (373,906) | 31,652
Cash and cash equivalents at beginning of year | 196,820 | 570,726 | 539,074
Cash and cash equivalents at end of year | $ 237,857 | $ 196,820 | $ 570,726

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