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Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]
Debt Securities Available for Sale, Due in one year or less, Amortized Cost	$ 14,492
Debt Securities Available for Sale, Due after one year through five years, Amortized Cost	239,148
Debt Securities Available for Sale, Due after five years through ten years, Amortized Cost	2,066,697
Debt Securities Available for Sale, Due after ten years, Amortized Cost	3,090,165
Securities Available for Sale, Gross Amortized Cost	5,410,502	$ 4,637,610
Debt Securities Available for Sale, Due in one year or less, Fair Value	14,540
Debt Securities Available for Sale, Due after one year through five years, Fair Value	258,655
Debt Securities Available for Sale, Due after five years through ten years, Fair Value	2,196,332
Debt Securities Available for Sale, Due after ten years, Fair Value	3,177,788
Total available for sale debt securities, Fair Value	5,647,315	4,675,304
Debt Securities Held to Maturity, Due in one year or less, Amortized Cost	2,196
Debt Securities Held to Maturity, Due after one year through five years, Amortized Cost	189,141
Debt Securities Held to Maturity, Due after five years through ten years, Amortized Cost	636,976
Debt Securities Held to Maturity, Due after ten years, Amortized Cost	580,648
Total held to maturity debt securities, Amortized Cost	1,408,961	1,568,009
Debt Securities Held to Maturity, Due in one year or less, Fair Value	2,191
Debt Securities Held to Maturity, Due after one year through five years, Fair Value	201,869
Debt Securities Held to Maturity, Due after five years through ten years, Fair Value	701,345
Debt Securities Held to Maturity, Due after ten years, Fair Value	612,283
Total held to maturity debt securities, Fair Value	$ 1,517,688	$ 1,611,004

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X

- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120252992&loc=d3e62586-112803

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)(1)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563

Reference 2: 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(6))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration