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Premises and Equipment and Leases Premises and Equipment and Leases (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Premises and Equipment [Line Items] |  |  |
Premises and equipment | $ 924,298 | $ 843,041 |
Less accumulated depreciation | 350,150 | 291,733 |
Premises and equipment, net of accumulated depreciation | 574,148 | 551,308 |
Depreciation Expense | $ 63,400 | 54,300 | $ 51,600
Lease, Cost [Abstract] |  |  |
Operating Lease, Weighted Average Remaining Lease Term | 10 years 10 months 24 days |  |
Operating Lease, Weighted Average Discount Rate, Percent | 2.90% |  |
Operating Lease, costs recognized as occupancy and equipment expense | $ 23,400 | 25,000 | 24,200
Operating Lease, operating cash flows | 25,300 | 25,600 |
Lease, Cost | 35,800 | 42,000 | 43,000
Short-term Lease, Cost | 11,500 | 13,400 | $ 12,600
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |
Operating Leases, Payments Due, 2022 | 23,800 |  |
Operating Leases, Payments, 2023 | 24,700 |  |
Operating Leases, Payments, 2024 | 24,300 |  |
Operating Leases, Payments, 2025 | 23,600 |  |
Operating Lease, Payments, 2026 | 22,600 |  |
Operating Leases, Payments, 2027 and later | 130,000 |  |
Premises and equipment, net |  |  |
Premises and Equipment [Line Items] |  |  |
Operating Lease, Right-of-Use Asset | 181,000 | 166,000 |
Lease, Cost [Abstract] |  |  |
Operating Lease, Right-of-Use Asset | 181,000 | 166,000 |
Land |  |  |
Premises and Equipment [Line Items] |  |  |
Premises and equipment | 69,776 | 69,776 |
Buildings and improvements |  |  |
Premises and Equipment [Line Items] |  |  |
Premises and equipment | 472,450 | 440,528 |
Software and related integration |  |  |
Premises and Equipment [Line Items] |  |  |
Premises and equipment | 159,063 | 120,444 |
Furniture and equipment |  |  |
Premises and Equipment [Line Items] |  |  |
Premises and equipment | 186,092 | 165,344 |
Construction in progress |  |  |
Premises and Equipment [Line Items] |  |  |
Premises and equipment | $ 36,917 | $ 46,949 |

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