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Premises and Equipment and Leases Premises and Equipment and Leases (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Premises and Equipment [Line Items] |  |  |
Premises and equipment | $ 779,050 | $ 645,017 |
Less accumulated depreciation | 243,531 | 314,984 |
Premises and equipment, net of accumulated depreciation | 535,519 | 330,033 |
Depreciation Expense | 51,600 | 51,200 | $ 47,700
Operating Lease, Right-of-Use Asset | $ 180,000 |  |
Lease, Cost [Abstract] |  |  |
Operating Lease, Weighted Average Remaining Lease Term | 11 years 1 month 6 days |  |
Operating Lease, Weighted Average Discount Rate, Percent | 3.20% |  |
Operating Lease, costs recognized as occupancy and equipment expense | $ 24,200 |  |
Operating Lease, operating cash flows | 23,300 |  |
Lease, Cost | 43,000 | 28,500 | $ 27,500
Short-term Lease, Cost | 12,600 |  |
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |
Operating Leases, Payments Due, Next Twelve Months | 27,500 |  |
Operating Leases, Payments, Due in Two Years | 25,700 |  |
Operating Leases, Payments, Due in Three Years | 20,100 |  |
Operating Leases, Payments, Due in Four Years | 18,900 |  |
Operating Lease, Payments, Due Year Five | 18,200 |  |
Operating Leases, Payments, Due after Five Years | 127,000 |  |
Land |  |  |
Premises and Equipment [Line Items] |  |  |
Premises and equipment | 69,960 | 70,575 |
Buildings and improvements |  |  |
Premises and Equipment [Line Items] |  |  |
Premises and equipment | 421,952 | 266,733 |
Software and related integration |  |  |
Premises and Equipment [Line Items] |  |  |
Premises and equipment | 98,487 | 150,207 |
Furniture and equipment |  |  |
Premises and Equipment [Line Items] |  |  |
Premises and equipment | 135,153 | 129,988 |
Construction in progress |  |  |
Premises and Equipment [Line Items] |  |  |
Premises and equipment | $ 53,498 | $ 27,514 |

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