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Securities (Tables) | 6 Months Ended
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Jun. 30, 2025
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items] |
Amortized Cost and Fair Value of Debt Securities Available for Sale |
| June 30, 2025 |  | December 31, 2024 |
|  |  | Gross |  | Gross |  |  |  |  |  | Gross |  | Gross |  |  |
Securities Available for Sale | Amortized |  | Unrealized |  | Unrealized |  | Fair |  | Amortized |  | Unrealized |  | Unrealized |  | Fair |
($ in thousands) | Cost |  | Gains |  | Losses |  | Value |  | Cost |  | Gains |  | Losses |  | Value |
U.S. Treasury and government agency securities | $ | 270,722 |  | $ | 2,668 |  | $ | 1,757 |  | $ | 271,633 |  | $ | 185,827 |  | $ | 349 |  | $ | 3,894 |  | $ | 182,282 |
Municipal obligations |  | 196,524 |  |  | 13 |  |  | 2,283 |  |  | 194,254 |  |  | 200,272 |  |  | — |  |  | 3,942 |  |  | 196,330 |
Residential mortgage-backed securities |  | 2,566,235 |  |  | 6,090 |  |  | 300,259 |  |  | 2,272,066 |  |  | 2,482,109 |  |  | 496 |  |  | 353,554 |  |  | 2,129,051 |
Commercial mortgage-backed securities |  | 3,019,759 |  |  | 11,858 |  |  | 179,361 |  |  | 2,852,256 |  |  | 2,849,372 |  |  | 2,185 |  |  | 250,592 |  |  | 2,600,965 |
Collateralized mortgage obligations |  | 31,718 |  |  | — |  |  | 1,565 |  |  | 30,153 |  |  | 37,553 |  |  | — |  |  | 2,306 |  |  | 35,247 |
Corporate debt securities |  | 17,500 |  |  | — |  |  | 1,186 |  |  | 16,314 |  |  | 19,000 |  |  | — |  |  | 1,384 |  |  | 17,616 |
Total | $ | 6,102,458 |  | $ | 20,629 |  | $ | 486,411 |  | $ | 5,636,676 |  | $ | 5,774,133 |  | $ | 3,030 |  | $ | 615,672 |  | $ | 5,161,491 |
Amortized Cost and Fair Value of Debt Securities Held to Maturity |
| June 30, 2025 |  | December 31, 2024 |
|  |  | Gross |  | Gross |  |  |  |  |  | Gross |  | Gross |  |  |
Securities Held to Maturity | Amortized |  | Unrealized |  | Unrealized |  | Fair |  | Amortized |  | Unrealized |  | Unrealized |  | Fair |
($ in thousands) | Cost |  | Gains |  | Losses |  | Value |  | Cost |  | Gains |  | Losses |  | Value |
U.S. Treasury and government agency securities | $ | 383,892 |  | $ | 160 |  | $ | 34,943 |  | $ | 349,109 |  | $ | 394,689 |  | $ | — |  | $ | 45,876 |  | $ | 348,813 |
Municipal obligations |  | 549,495 |  |  | 169 |  |  | 15,089 |  |  | 534,575 |  |  | 623,907 |  |  | 169 |  |  | 20,867 |  |  | 603,209 |
Residential mortgage-backed securities |  | 534,652 |  |  | — |  |  | 42,703 |  |  | 491,949 |  |  | 573,057 |  |  | — |  |  | 61,525 |  |  | 511,532 |
Commercial mortgage-backed securities |  | 741,086 |  |  | — |  |  | 55,032 |  |  | 686,054 |  |  | 818,604 |  |  | — |  |  | 72,854 |  |  | 745,750 |
Collateralized mortgage obligations |  | 22,210 |  |  | — |  |  | 825 |  |  | 21,385 |  |  | 25,406 |  |  | — |  |  | 1,184 |  |  | 24,222 |
Total | $ | 2,231,335 |  | $ | 329 |  | $ | 148,592 |  | $ | 2,083,072 |  | $ | 2,435,663 |  | $ | 169 |  | $ | 202,306 |  | $ | 2,233,526 |
Available for Sale Securities [Member] |
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items] |
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity |
Debt Securities Available for Sale |  | Amortized |  |  | Fair |
($ in thousands) |  | Cost |  |  | Value |
Due in one year or less |  | $ | 31,178 |  |  | $ | 31,224 |
Due after one year through five years |  |  | 1,263,829 |  |  |  | 1,241,150 |
Due after five years through ten years |  |  | 2,194,300 |  |  |  | 2,038,471 |
Due after ten years |  |  | 2,613,151 |  |  |  | 2,325,831 |
Total debt securities available for sale |  | $ | 6,102,458 |  |  | $ | 5,636,676 |
Securities with Unrealized Losses | The fair value and gross unrealized losses for securities classified as available for sale with unrealized losses for the periods indicated follow.
|  | June 30, 2025 |
Available for Sale |  | Losses < 12 months |  |  | Losses 12 months or > |  |  | Total |
($ in thousands) |  | Fair Value |  | Gross Unrealized Losses |  |  | Fair Value |  | Gross Unrealized Losses |  |  | Fair Value |  | Gross Unrealized Losses |
U.S. Treasury and government agency securities |  | $ | 35,206 |  | $ | 349 |  |  | $ | 7,150 |  | $ | 1,408 |  |  | $ | 42,356 |  | $ | 1,757 |
Municipal obligations |  |  | 17,927 |  |  | 37 |  |  |  | 168,200 |  |  | 2,246 |  |  |  | 186,127 |  |  | 2,283 |
Residential mortgage-backed securities |  |  | 85,738 |  |  | 374 |  |  |  | 1,501,807 |  |  | 299,885 |  |  |  | 1,587,545 |  |  | 300,259 |
Commercial mortgage-backed securities |  |  | 22,229 |  |  | 219 |  |  |  | 2,222,358 |  |  | 179,142 |  |  |  | 2,244,587 |  |  | 179,361 |
Collateralized mortgage obligations |  |  | — |  |  | — |  |  |  | 30,153 |  |  | 1,565 |  |  |  | 30,153 |  |  | 1,565 |
Corporate debt securities |  |  | 1,991 |  |  | 9 |  |  |  | 14,323 |  |  | 1,177 |  |  |  | 16,314 |  |  | 1,186 |
Total |  | $ | 163,091 |  | $ | 988 |  |  | $ | 3,943,991 |  | $ | 485,423 |  |  | $ | 4,107,082 |  | $ | 486,411 |
|  | December 31, 2024 |
Available for Sale |  | Losses < 12 Months |  |  | Losses 12 Months or > |  |  | Total |
($ in thousands) |  | Fair Value |  | Gross Unrealized Losses |  |  | Fair Value |  | Gross Unrealized Losses |  |  | Fair Value |  | Gross Unrealized Losses |
U.S. Treasury and government agency securities |  | $ | 130,453 |  | $ | 2,243 |  |  | $ | 7,247 |  | $ | 1,651 |  |  | $ | 137,700 |  | $ | 3,894 |
Municipal obligations |  |  | 24,149 |  |  | 247 |  |  |  | 170,110 |  |  | 3,695 |  |  |  | 194,259 |  |  | 3,942 |
Residential mortgage-backed securities |  |  | 347,772 |  |  | 2,935 |  |  |  | 1,554,001 |  |  | 350,619 |  |  |  | 1,901,773 |  |  | 353,554 |
Commercial mortgage-backed securities |  |  | 184,534 |  |  | 2,738 |  |  |  | 2,139,191 |  |  | 247,854 |  |  |  | 2,323,725 |  |  | 250,592 |
Collateralized mortgage obligations |  |  | — |  |  | — |  |  |  | 35,247 |  |  | 2,306 |  |  |  | 35,247 |  |  | 2,306 |
Corporate debt securities |  |  | — |  |  | — |  |  |  | 15,616 |  |  | 1,384 |  |  |  | 15,616 |  |  | 1,384 |
Total |  | $ | 686,908 |  | $ | 8,163 |  |  | $ | 3,921,412 |  | $ | 607,509 |  |  | $ | 4,608,320 |  | $ | 615,672 |
Held-to-maturity Securities [Member] |
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items] |
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity |
Debt Securities Held to Maturity |  | Amortized |  |  | Fair |
($ in thousands) |  | Cost |  |  | Value |
Due in one year or less |  | $ | 53,755 |  |  | $ | 53,621 |
Due after one year through five years |  |  | 753,558 |  |  |  | 727,480 |
Due after five years through ten years |  |  | 501,491 |  |  |  | 475,343 |
Due after ten years |  |  | 922,531 |  |  |  | 826,628 |
Total debt securities held to maturity |  | $ | 2,231,335 |  |  | $ | 2,083,072 |
Securities with Unrealized Losses | The fair value and gross unrealized losses for securities classified as held to maturity with unrealized losses for the periods indicated follow.
|  | June 30, 2025 |
Held to Maturity |  | Losses < 12 Months |  |  | Losses 12 Months or > |  |  | Total |
($ in thousands) |  | Fair Value |  | Gross Unrealized Losses |  |  | Fair Value |  | Gross Unrealized Losses |  |  | Fair Value |  | Gross Unrealized Losses |
U.S. Treasury and government agency securities |  | $ | 8,823 |  | $ | 86 |  |  | $ | 321,522 |  | $ | 34,857 |  |  | $ | 330,345 |  | $ | 34,943 |
Municipal obligations |  |  | 76,330 |  |  | 105 |  |  |  | 432,533 |  |  | 14,984 |  |  |  | 508,863 |  |  | 15,089 |
Residential mortgage-backed securities |  |  | — |  |  | — |  |  |  | 491,949 |  |  | 42,703 |  |  |  | 491,949 |  |  | 42,703 |
Commercial mortgage-backed securities |  |  | — |  |  | — |  |  |  | 686,054 |  |  | 55,032 |  |  |  | 686,054 |  |  | 55,032 |
Collateralized mortgage obligations |  |  | — |  |  | — |  |  |  | 21,385 |  |  | 825 |  |  |  | 21,385 |  |  | 825 |
Total |  | $ | 85,153 |  | $ | 191 |  |  | $ | 1,953,443 |  | $ | 148,401 |  |  | $ | 2,038,596 |  | $ | 148,592 |
|  | December 31, 2024 |
Held to Maturity |  | Losses < 12 Months |  |  | Losses 12 Months or > |  |  | Total |
($ in thousands) |  | Fair Value |  | Gross Unrealized Losses |  |  | Fair Value |  | Gross Unrealized Losses |  |  | Fair Value |  | Gross Unrealized Losses |
U.S. Treasury and government agency securities |  | $ | 27,660 |  | $ | 840 |  |  | $ | 321,154 |  | $ | 45,036 |  |  | $ | 348,814 |  | $ | 45,876 |
Municipal obligations |  |  | 82,028 |  |  | 451 |  |  |  | 497,999 |  |  | 20,416 |  |  |  | 580,027 |  |  | 20,867 |
Residential mortgage-backed securities |  |  | — |  |  | — |  |  |  | 511,531 |  |  | 61,525 |  |  |  | 511,531 |  |  | 61,525 |
Commercial mortgage-backed securities |  |  | — |  |  | — |  |  |  | 745,750 |  |  | 72,854 |  |  |  | 745,750 |  |  | 72,854 |
Collateralized mortgage obligations |  |  | — |  |  | — |  |  |  | 24,222 |  |  | 1,184 |  |  |  | 24,222 |  |  | 1,184 |
Total |  | $ | 109,688 |  | $ | 1,291 |  |  | $ | 2,100,656 |  | $ | 201,015 |  |  | $ | 2,210,344 |  | $ | 202,306 |

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