Securities (Amortized Cost and Fair Value of Debt Securities Held to Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	$ 2,488,088	$ 1,565,751
Securities Held to Maturity, Gross Unrealized Gains	8,019	68,124
Securities Held to Maturity, Gross Unrealized Losses	67,058	2,393
Securities Held to Maturity, Fair Value	2,429,049	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	368,334	14,857
Securities Held to Maturity, Gross Unrealized Losses	14,745	20
Securities Held to Maturity, Fair Value	353,589	14,837
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	696,275	621,405
Securities Held to Maturity, Gross Unrealized Gains	5,986	37,941
Securities Held to Maturity, Gross Unrealized Losses	7,492	205
Securities Held to Maturity, Fair Value	694,769	659,141
Residential Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	525,039	268,907
Securities Held to Maturity, Gross Unrealized Gains	211	682
Securities Held to Maturity, Gross Unrealized Losses	23,814	1,499
Securities Held to Maturity, Fair Value	501,436	268,090
Commercial Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	836,060	603,156
Securities Held to Maturity, Gross Unrealized Gains	1,775	28,679
Securities Held to Maturity, Gross Unrealized Losses	19,998	669
Securities Held to Maturity, Fair Value	817,837	631,166
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	62,380	57,426
Securities Held to Maturity, Gross Unrealized Gains	47	822
Securities Held to Maturity, Gross Unrealized Losses	1,009
Securities Held to Maturity, Fair Value	$ 61,418	$ 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 http://asc.fasb.org/extlink&oid=123581744&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=123581744&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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