Securities (Amortized Cost and Fair Value of Debt Securities Held to Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	$ 2,752,012	$ 1,565,751
Securities Held to Maturity, Gross Unrealized Gains	1,967	68,124
Securities Held to Maturity, Gross Unrealized Losses	138,181	2,393
Securities Held to Maturity, Fair Value	2,615,798	1,631,482
U.S. Treasury And Government Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	389,878	14,857
Securities Held to Maturity, Gross Unrealized Losses	28,700	20
Securities Held to Maturity, Fair Value	361,346	14,837
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	704,862	621,405
Securities Held to Maturity, Gross Unrealized Gains	1,798	37,941
Securities Held to Maturity, Gross Unrealized Losses	18,117	205
Securities Held to Maturity, Fair Value	688,543	659,141
Residential Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	702,905	268,907
Securities Held to Maturity, Gross Unrealized Gains		682
Securities Held to Maturity, Gross Unrealized Losses	43,366	1,499
Securities Held to Maturity, Fair Value	659,539	268,090
Commercial Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	900,776	603,156
Securities Held to Maturity, Gross Unrealized Gains		28,679
Securities Held to Maturity, Gross Unrealized Losses	46,664	669
Securities Held to Maturity, Fair Value	854,112	631,166
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	53,591	57,426
Securities Held to Maturity, Gross Unrealized Gains	1	822
Securities Held to Maturity, Gross Unrealized Losses	1,334
Securities Held to Maturity, Fair Value	$ 52,258	$ 58,248

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.

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