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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred income tax assets |  |
Net unrealized losses on investment securities available for sale and cash flow hedges | $ 348,712 | $ 455,744
Allowance for credit losses | 130,205 | 121,941
Lease liability | 120,534 | 107,818
Employee benefits and deferred compensation | 40,601 | 42,746
Net operating loss carryforwards | 32,126 | 23,590
Tax credit carryforwards | 15,532 | 14,553
FDIC Special Assessment | 12,058 | 0
Unrealized losses on fair value hedges | 7,480 | 11,101
Non-performing loan interest | 5,877 | 2,695
Miscellaneous accrued expenses | 5,659 | 5,125
Fair value of investment securities and loans | 1,422 | 2,019
Other | 7,423 | 6,585
Total gross deferred tax assets | 727,629 | 793,917
Less valuation allowance | (26,184) | (19,114)
Total deferred tax assets | 701,445 | 774,803
Deferred tax liabilities |  |
Right-of-use asset | (114,529) | (102,945)
Purchase accounting intangibles | (23,276) | (15,224)
Excess tax over financial statement depreciation | (20,457) | (23,762)
Deferred loan costs | (16,810) | (15,901)
Unrealized gain on hedged liabilities | (7,480) | (11,101)
Prepaid expense | (6,917) | (4,947)
Other properties held for sale | (1,434) | (2,828)
Other | (3,640) | (2,778)
Total gross deferred tax liabilities | (194,543) | (179,486)
Net deferred tax asset | $ 506,902 | $ 595,317

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