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Premises and Equipment Future Minimum Lease Payments Due Under non-Cancelable Operating Leases (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Property, Plant and Equipment [Line Items]
2020	$ 28,225
2021	30,813
2022	28,175
2023	26,661
2024	25,232
Thereafter	283,300
Total undiscounted operating lease liability	422,406
Imputed interest	98,718
Total operating lease liability included in the accompanying balance sheet	$ 323,688
Weighted-average lease term in years	16 years 5 months 26 days
Weighted-average discount rate	3.17%

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Imputed interest operating lease liability

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Amount of lessee's undiscounted obligation for lease payments for operating lease.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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