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Securities (Amortized Cost and Fair Value of Debt Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized cost | $ 2,653,759 | $ 2,684,779
Securities Held to Maturity, Gross unrealized gains | 739 | 1,431
Securities Held to Maturity, Gross unrealized losses | 217,888 | 200,292
Securities Held to Maturity, Fair value | 2,436,610 | 2,485,918
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized cost | 409,435 | 413,490
Securities Held to Maturity, Gross unrealized gains |  | 179
Securities Held to Maturity, Gross unrealized losses | 48,083 | 43,971
Securities Held to Maturity, Fair value | 361,352 | 369,698
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized cost | 660,372 | 664,488
Securities Held to Maturity, Gross unrealized gains | 739 | 1,252
Securities Held to Maturity, Gross unrealized losses | 23,185 | 19,593
Securities Held to Maturity, Fair value | 637,926 | 646,147
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized cost | 636,208 | 654,262
Securities Held to Maturity, Gross unrealized losses | 64,540 | 59,223
Securities Held to Maturity, Fair value | 571,668 | 595,039
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized cost | 917,008 | 920,048
Securities Held to Maturity, Gross unrealized losses | 80,280 | 75,803
Securities Held to Maturity, Fair value | 836,728 | 844,245
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized cost | 30,736 | 32,491
Securities Held to Maturity, Gross unrealized losses | 1,800 | 1,702
Securities Held to Maturity, Fair value | $ 28,936 | $ 30,789

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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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