Securities (Amortized Cost and Fair Value of Debt Securities Held to Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	$ 2,825,064	$ 2,852,495
Securities Held to Maturity, Gross Unrealized Gains	2,811	774
Securities Held to Maturity, Gross Unrealized Losses	204,115	237,871
Securities Held to Maturity, Fair Value	2,623,760	2,615,398
U.S. Treasury And Government Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	427,643	426,454
Securities Held to Maturity, Gross Unrealized Gains	824	21
Securities Held to Maturity, Gross Unrealized Losses	41,538	49,044
Securities Held to Maturity, Fair Value	386,929	377,431
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	696,471	698,908
Securities Held to Maturity, Gross Unrealized Gains	1,987	753
Securities Held to Maturity, Gross Unrealized Losses	19,262	26,558
Securities Held to Maturity, Fair Value	679,196	673,103
Residential Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	715,499	734,478
Securities Held to Maturity, Gross Unrealized Losses	63,526	72,532
Securities Held to Maturity, Fair Value	651,973	661,946
Commercial Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	944,292	948,691
Securities Held to Maturity, Gross Unrealized Losses	77,653	87,211
Securities Held to Maturity, Fair Value	866,639	861,480
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	41,159	43,964
Securities Held to Maturity, Gross Unrealized Losses	2,136	2,526
Securities Held to Maturity, Fair Value	$ 39,023	$ 41,438

Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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- Definition

Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

+ References

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- Definition

Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity).

+ References

No definition available.

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- 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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=126897435&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 https://asc.fasb.org/extlink&oid=126970911&loc=SL120269820-111563

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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