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Premises and Equipment Future Minimum Lease Payments Due Under non-Cancelable Operating Leases (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019
--- | --- | --- | ---
Property, Plant and Equipment [Line Items] |  |  |
2021 | $ 32,357 |  |
2022 | 30,741 |  |
2023 | 28,927 |  |
2024 | 27,487 |  |
2025 | 26,240 |  |
Thereafter | 267,707 |  |
Total undiscounted operating lease liability | 413,459 |  |
Imputed interest | $ 90,415 |  |
Weighted-average lease term in years | 15 years 6 months 25 days |  |
Weighted-average discount rate | 3.10% |  |
Other Liabilities [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total operating lease liability included in the accompanying balance sheet | $ 323,044 | $ 323,700 | $ 174,400

X
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