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Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019
Goodwill [Line Items]
Goodwill	$ 452,390	$ 452,390	$ 497,267	$ 57,315
Finite-lived core deposits	$ 37,600	37,600
Percent of Income-Based Discounted Cash Flow Approach Used	60.00%
Percent of Market-Based Approach Used	40.00%
Goodwill impairment		44,877	0	0
Consumer Mortgages Reporting Unit
Goodwill [Line Items]
Goodwill	$ 0	0	44,877	3,123
Goodwill impairment		44,877
FCB Financial Holdings, Inc.
Goodwill [Line Items]
Goodwill					$ 440,000
Core deposit intangible					$ 57,400
Global One
Goodwill [Line Items]
Amortization of intangibles		$ 10,600	$ 11,600	$ 1,200
CDI | FCB Financial Holdings, Inc.
Goodwill [Line Items]
Finite-lived intangible asset, useful life		10 years

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Bank deposits belonging to an acquired bank that can be counted on as a stable source of lending funds. These deposits have the following attributes: predictable costs and low sensitivity to interest rates. This intangible asset is usually amortized over its estimated useful life.

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