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Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-Sale [Line Items] |  |
Securities Available for Sale, Amortized Cost | $ 6,102,458 | $ 5,774,133
Securities Available for Sale, Gross Unrealized Gains | 20,629 | 3,030
Securities Available for Sale, Gross Unrealized Losses | 486,411 | 615,672
Securities Available for Sale, Fair Value | 5,636,676 | 5,161,491
U.S. Treasury And Government Agency Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities Available for Sale, Amortized Cost | 270,722 | 185,827
Securities Available for Sale, Gross Unrealized Gains | 2,668 | 349
Securities Available for Sale, Gross Unrealized Losses | 1,757 | 3,894
Securities Available for Sale, Fair Value | 271,633 | 182,282
Municipal Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities Available for Sale, Amortized Cost | 196,524 | 200,272
Securities Available for Sale, Gross Unrealized Gains | 13 |
Securities Available for Sale, Gross Unrealized Losses | 2,283 | 3,942
Securities Available for Sale, Fair Value | 194,254 | 196,330
Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities Available for Sale, Amortized Cost | 2,566,235 | 2,482,109
Securities Available for Sale, Gross Unrealized Gains | 6,090 | 496
Securities Available for Sale, Gross Unrealized Losses | 300,259 | 353,554
Securities Available for Sale, Fair Value | 2,272,066 | 2,129,051
Commercial Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities Available for Sale, Amortized Cost | 3,019,759 | 2,849,372
Securities Available for Sale, Gross Unrealized Gains | 11,858 | 2,185
Securities Available for Sale, Gross Unrealized Losses | 179,361 | 250,592
Securities Available for Sale, Fair Value | 2,852,256 | 2,600,965
Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities Available for Sale, Amortized Cost | 31,718 | 37,553
Securities Available for Sale, Gross Unrealized Losses | 1,565 | 2,306
Securities Available for Sale, Fair Value | 30,153 | 35,247
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities Available for Sale, Amortized Cost | 17,500 | 19,000
Securities Available for Sale, Gross Unrealized Losses | 1,186 | 1,384
Securities Available for Sale, Fair Value | $ 16,314 | $ 17,616

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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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