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Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]
Debt Securities Available for Sale, Due in one year or less, Amortized Cost	$ 3,810
Debt Securities Available for Sale, Due after one year through five years, Amortized Cost	240,883
Debt Securities Available for Sale, Due after five years through ten years, Amortized Cost	2,457,451
Debt Securities Available for Sale, Due after ten years, Amortized Cost	3,064,090
Securities Available for Sale, Gross Amortized Cost	5,766,234	$ 4,637,610
Debt Securities Available for Sale, Due in one year or less, Fair Value	3,810
Debt Securities Available for Sale, Due after one year through five years, Fair Value	260,170
Debt Securities Available for Sale, Due after five years through ten years, Fair Value	2,587,529
Debt Securities Available for Sale, Due after ten years, Fair Value	3,147,818
Total available for sale debt securities, Fair Value	5,999,327	4,675,304
Debt Securities Held to Maturity, Due in one year or less, Amortized Cost	2,192
Debt Securities Held to Maturity, Due after one year through five years, Amortized Cost	204,134
Debt Securities Held to Maturity, Due after five years through ten years, Amortized Cost	636,268
Debt Securities Held to Maturity, Due after ten years, Amortized Cost	514,576
Total held to maturity debt securities, Amortized Cost	1,357,170	1,568,009
Debt Securities Held to Maturity, Due in one year or less, Fair Value	2,190
Debt Securities Held to Maturity, Due after one year through five years, Fair Value	218,501
Debt Securities Held to Maturity, Due after five years through ten years, Fair Value	702,412
Debt Securities Held to Maturity, Due after ten years, Fair Value	544,478
Total held to maturity debt securities, Fair Value	$ 1,467,581	$ 1,611,004

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- 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