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Parent Company Financial Statements - Condensed Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Assets |  |  |  |
Equity securities, at fair value | $ 13,211 | $ 2,547 |  |
Total investment securities - available-for-sale | 7,382,066 | 5,970,115 |  |
Investment in affiliates: |  |  |  |
Other assets | 372,079 | 345,445 |  |
Total assets | 24,453,564 | 22,960,622 |  |
Liabilities and Shareholders' Equity |  |  |  |
Other borrowings | 296,670 | 252,787 |  |
Shareholders' equity | 3,012,018 | 2,972,656 | $ 2,852,453 | $ 2,689,570
Total liabilities and shareholders' equity | 24,453,564 | 22,960,622 |  |
Old National Bancorp |  |  |  |
Assets |  |  |  |
Deposits in affiliate bank | 102,953 | 73,340 |  |
Equity securities, at fair value | 3,257 | 2,435 |  |
Total investment securities - available-for-sale | 13,888 | 14,198 |  |
Investment in affiliates: |  |  |  |
Banking subsidiaries | 3,053,575 | 3,037,930 |  |
Non-banks | 4,949 | 4,969 |  |
Other assets | 83,531 | 89,776 |  |
Total assets | 3,262,153 | 3,222,648 |  |
Liabilities and Shareholders' Equity |  |  |  |
Other liabilities | 36,582 | 36,746 |  |
Other borrowings | 213,553 | 213,246 |  |
Shareholders' equity | 3,012,018 | 2,972,656 |  |
Total liabilities and shareholders' equity | $ 3,262,153 | $ 3,222,648 |  |

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