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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