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Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Securities available for sale, amortized cost | $ 5,535,212 | $ 5,496,718
Securities Available for Sale, Gross unrealized gains | 4,993 | 11,570
Securities Available for Sale, Gross unrealized losses | 634,782 | 593,093
Securities Available for Sale, Fair value | 4,905,423 | 4,915,195
U.S. Treasury And Government Agency Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities available for sale, amortized cost | 114,086 | 97,741
Securities Available for Sale, Gross unrealized gains | 722 | 1,581
Securities Available for Sale, Gross unrealized losses | 1,670 | 1,514
Securities Available for Sale, Fair value | 113,138 | 97,808
Municipal Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities available for sale, amortized cost | 202,764 | 203,533
Securities Available for Sale, Gross unrealized gains |  | 79
Securities Available for Sale, Gross unrealized losses | 3,730 | 2,200
Securities Available for Sale, Fair value | 199,034 | 201,412
Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities available for sale, amortized cost | 2,401,546 | 2,440,411
Securities Available for Sale, Gross unrealized gains | 743 | 2,734
Securities Available for Sale, Gross unrealized losses | 357,044 | 329,279
Securities Available for Sale, Fair value | 2,045,245 | 2,113,866
Commercial Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities available for sale, amortized cost | 2,748,086 | 2,683,872
Securities Available for Sale, Gross unrealized gains | 3,528 | 7,176
Securities Available for Sale, Gross unrealized losses | 265,878 | 253,576
Securities Available for Sale, Fair value | 2,485,736 | 2,437,472
Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities available for sale, amortized cost | 45,230 | 47,661
Securities Available for Sale, Gross unrealized losses | 3,357 | 3,376
Securities Available for Sale, Fair value | 41,873 | 44,285
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities available for sale, amortized cost | 23,500 | 23,500
Securities Available for Sale, Gross unrealized losses | 3,103 | 3,148
Securities Available for Sale, Fair value | $ 20,397 | $ 20,352

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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