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Allowance for Credit Losses (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Increase in loan provision	$ 39.1
Accounting Standards Update 2019-04 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable Allowance For Credit Losses Period Increase Decrease	89.7
Accounting Standards Update 2019-04 [Member] | PCD [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable Allowance For Credit Losses Period Increase Decrease	$ 50.5
Percent of total loan portfolio	30.00%
Accounting Standards Update 2019-04 [Member] | Non-PCD [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable Allowance For Credit Losses Period Increase Decrease	$ 39.2
Percent of total loan portfolio	70.00%

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Increase (Decrease) In Loan Provision

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Percent Of Total Loan Portfolio

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Amount of increase (decrease) in allowance for credit loss on financing receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447

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