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Goodwill and Other Intangible Assets (Goodwill) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Goodwill [Roll Forward]
Balance as of December 31, 2020	$ 452,390
Goodwill acquired and adjustments during the year	0
Balance as of March 31, 2021	452,390
Community Banking Reporting Unit
Goodwill [Roll Forward]
Balance as of December 31, 2020	256,323
Goodwill acquired and adjustments during the year	0
Balance as of March 31, 2021	256,323
Wholesale Banking Reporting Unit
Goodwill [Roll Forward]
Balance as of December 31, 2020	171,636
Goodwill acquired and adjustments during the year	0
Balance as of March 31, 2021	171,636
Consumer Mortgage Reporting Unit
Goodwill [Roll Forward]
Balance as of December 31, 2020	0
Goodwill acquired and adjustments during the year	0
Balance as of March 31, 2021	0
Wealth Management Reporting Unit
Goodwill [Roll Forward]
Balance as of December 31, 2020	24,431
Goodwill acquired and adjustments during the year	0
Balance as of March 31, 2021	$ 24,431

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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X

- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
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- Definition

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+ References

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