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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Deferred income tax assets |  |
Allowance for loan losses | $ 165,691 | $ 73,929
Lease liability | 98,340 | 99,053
Net operating loss carryforwards | 29,684 | 38,972
Employee benefits and deferred compensation | 27,917 | 28,874
Deferred revenue | 24,751 | 8,237
Non-performing loan interest | 12,472 | 5,232
Fair value of investment securities and loans | 10,093 | 0
Tax credit carryforwards | 8,605 | 21,076
Other | 9,819 | 15,101
Total gross deferred tax assets | 387,372 | 290,474
Less valuation allowance | (19,191) | (18,445)
Total deferred tax assets | 368,181 | 272,029
Deferred tax liabilities |  |
Right-of-use asset | (98,681) | (97,400)
Net unrealized gains (losses) on investment securities available for sale and cash flow hedges | (64,344) | (31,678)
Excess tax over financial statement depreciation | (40,452) | (41,097)
Purchase accounting intangibles | (14,458) | (15,184)
Deferred Tax Liabilities, Prepaid Expenses | (5,955) | (5,664)
Fair value of investment securities and loans | 0 | (8,602)
Other | (13,443) | (7,302)
Total gross deferred tax liabilities | (237,333) | (206,927)
Net deferred tax assets | 130,848 | $ 65,102
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 746 |

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