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Segment Reporting (Narrative) (Details) $ in Thousands	3 Months Ended
Segment Reporting (Narrative) (Details) $ in Thousands	Mar. 31, 2024 USD ($) Segment	Jan. 01, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| Segment	3
Deposits	$ 60,747,743		$ 60,784,284
Goodwill	$ 2,868,068		$ 2,631,465	$ 2,514,104
Revision of Prior Period, Reclassification, Adjustment
Segment Reporting Information [Line Items]
Deposits		$ 2,200,000
Goodwill		77,200
Loans and leases, net		$ 1,500,000