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Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Securities Available for Sale, Amortized Cost | $ 6,287,446 | $ 6,341,322
Securities Available for Sale, Gross Unrealized Gains | 17,322 | 25,997
Securities Available for Sale, Gross Unrealized Losses | 328,382 | 405,402
Securities Available for Sale, Fair Value | 5,976,386 | 5,961,917
U.S. Treasury And Government Agency Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities Available for Sale, Amortized Cost | 279,080 | 266,825
Securities Available for Sale, Gross Unrealized Gains | 4,562 | 3,705
Securities Available for Sale, Gross Unrealized Losses | 1,175 | 1,198
Securities Available for Sale, Fair Value | 282,467 | 269,332
Municipal Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities Available for Sale, Amortized Cost | 180,786 | 191,754
Securities Available for Sale, Gross Unrealized Gains | 49 | 82
Securities Available for Sale, Gross Unrealized Losses | 692 | 508
Securities Available for Sale, Fair Value | 180,143 | 191,328
Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities Available for Sale, Amortized Cost | 2,567,467 | 2,620,980
Securities Available for Sale, Gross Unrealized Gains | 6,254 | 11,643
Securities Available for Sale, Gross Unrealized Losses | 240,316 | 256,994
Securities Available for Sale, Fair Value | 2,333,405 | 2,375,629
Commercial Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities Available for Sale, Amortized Cost | 3,218,115 | 3,217,663
Securities Available for Sale, Gross Unrealized Gains | 6,457 | 10,530
Securities Available for Sale, Gross Unrealized Losses | 84,252 | 144,868
Securities Available for Sale, Fair Value | 3,140,320 | 3,083,325
Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities Available for Sale, Amortized Cost | 24,998 | 27,100
Securities Available for Sale, Gross Unrealized Losses | 1,184 | 1,154
Securities Available for Sale, Fair Value | 23,814 | 25,946
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities Available for Sale, Amortized Cost | 17,000 | 17,000
Securities Available for Sale, Gross Unrealized Gains |  | 37
Securities Available for Sale, Gross Unrealized Losses | 763 | 680
Securities Available for Sale, Fair Value | $ 16,237 | $ 16,357

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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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