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Securities (Amortized Cost and Fair Value of Debt Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized cost | $ 2,727,945 | $ 2,852,495
Securities Held to Maturity, Gross unrealized gains |  | 774
Securities Held to Maturity, Gross unrealized losses | 297,658 | 237,871
Securities Held to Maturity, Fair value | 2,430,287 | 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 | 418,323 | 426,454
Securities Held to Maturity, Gross unrealized gains |  | 21
Securities Held to Maturity, Gross unrealized losses | 60,006 | 49,044
Securities Held to Maturity, Fair value | 358,317 | 377,431
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized cost | 667,809 | 698,908
Securities Held to Maturity, Gross unrealized gains |  | 753
Securities Held to Maturity, Gross unrealized losses | 39,068 | 26,558
Securities Held to Maturity, Fair value | 628,741 | 673,103
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized cost | 673,898 | 734,478
Securities Held to Maturity, Gross unrealized losses | 88,902 | 72,532
Securities Held to Maturity, Fair value | 584,996 | 661,946
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized cost | 933,260 | 948,691
Securities Held to Maturity, Gross unrealized losses | 107,231 | 87,211
Securities Held to Maturity, Fair value | 826,029 | 861,480
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized cost | 34,655 | 43,964
Securities Held to Maturity, Gross unrealized losses | 2,451 | 2,526
Securities Held to Maturity, Fair value | $ 32,204 | $ 41,438

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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5A Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5A Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 + Details
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