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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred income tax assets |  |
Net unrealized losses on investment securities available for sale and cash flow hedges | $ 455,744 | $ 19,261
Allowance for credit losses | 121,941 | 112,180
Lease liability | 107,818 | 102,412
Employee benefits and deferred compensation | 42,746 | 36,701
Net operating loss carryforwards | 23,590 | 23,897
Tax credit carryforwards | 14,553 | 15,870
Unrealized losses on fair value hedges | 11,101 | 0
Miscellaneous accrued expenses | 5,125 | 3,870
Fair value of investment securities and loans | 2,019 | 6,439
Non-performing loan interest | 2,695 | 2,621
Deferred revenue | 0 | 14,616
Other | 6,585 | 6,182
Total gross deferred tax assets | 793,917 | 344,049
Less valuation allowance | (19,114) | (19,003)
Total deferred tax assets | 774,803 | 325,046
Deferred tax liabilities |  |
Right-of-use asset | (102,945) | (98,773)
Excess tax over financial statement depreciation | (23,762) | (27,355)
Purchase accounting intangibles | (15,224) | (14,820)
Deferred loan fees | (15,901) | 0
Unrealized gain on hedged liabilities | (11,101) | 0
Prepaid expense | (4,947) | (4,631)
Other properties held for sale | (2,828) | (5,345)
Other | (2,778) | (5,071)
Total gross deferred tax liabilities | (179,486) | (155,995)
Net deferred tax assets | $ 595,317 | $ 169,051

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