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Securities (Tables) | 9 Months Ended
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Sep. 30, 2024
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 |
| September 30, 2024 |  | December 31, 2023 |
|  |  | 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 | $ | 171,333 |  | $ | 3,806 |  | $ | 1,371 |  | $ | 173,768 |  | $ | 97,741 |  | $ | 1,581 |  | $ | 1,514 |  | $ | 97,808 |
Municipal obligations |  | 201,128 |  |  | 55 |  |  | 1,824 |  |  | 199,359 |  |  | 203,533 |  |  | 79 |  |  | 2,200 |  |  | 201,412 |
Residential mortgage-backed securities |  | 2,469,381 |  |  | 6,687 |  |  | 280,396 |  |  | 2,195,672 |  |  | 2,440,411 |  |  | 2,734 |  |  | 329,279 |  |  | 2,113,866 |
Commercial mortgage-backed securities |  | 2,839,988 |  |  | 13,836 |  |  | 185,916 |  |  | 2,667,908 |  |  | 2,683,872 |  |  | 7,176 |  |  | 253,576 |  |  | 2,437,472 |
Collateralized mortgage obligations |  | 39,950 |  |  | — |  |  | 1,964 |  |  | 37,986 |  |  | 47,661 |  |  | — |  |  | 3,376 |  |  | 44,285 |
Corporate debt securities |  | 23,500 |  |  | — |  |  | 2,046 |  |  | 21,454 |  |  | 23,500 |  |  | — |  |  | 3,148 |  |  | 20,352 |
Total | $ | 5,745,280 |  | $ | 24,384 |  | $ | 473,517 |  | $ | 5,296,147 |  | $ | 5,496,718 |  | $ | 11,570 |  | $ | 593,093 |  | $ | 4,915,195 |
Amortized Cost and Fair Value of Debt Securities Held to Maturity |
| September 30, 2024 |  | December 31, 2023 |
|  |  | 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 | $ | 400,115 |  | $ | 661 |  | $ | 34,673 |  | $ | 366,103 |  | $ | 413,490 |  | $ | 179 |  | $ | 43,971 |  | $ | 369,698 |
Municipal obligations |  | 628,365 |  |  | 915 |  |  | 15,255 |  |  | 614,025 |  |  | 664,488 |  |  | 1,252 |  |  | 19,593 |  |  | 646,147 |
Residential mortgage-backed securities |  | 593,502 |  |  | — |  |  | 43,613 |  |  | 549,889 |  |  | 654,262 |  |  | — |  |  | 59,223 |  |  | 595,039 |
Commercial mortgage-backed securities |  | 824,601 |  |  | — |  |  | 55,404 |  |  | 769,197 |  |  | 920,048 |  |  | — |  |  | 75,803 |  |  | 844,245 |
Collateralized mortgage obligations |  | 27,050 |  |  | — |  |  | 1,006 |  |  | 26,044 |  |  | 32,491 |  |  | — |  |  | 1,702 |  |  | 30,789 |
Total | $ | 2,473,633 |  | $ | 1,576 |  | $ | 149,951 |  | $ | 2,325,258 |  | $ | 2,684,779 |  | $ | 1,431 |  | $ | 200,292 |  | $ | 2,485,918 |
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 |  | $ | 66,226 |  |  | $ | 66,092 |
Due after one year through five years |  |  | 946,854 |  |  |  | 934,210 |
Due after five years through ten years |  |  | 2,292,196 |  |  |  | 2,121,901 |
Due after ten years |  |  | 2,440,004 |  |  |  | 2,173,944 |
Total available for sale debt securities |  | $ | 5,745,280 |  |  | $ | 5,296,147 |
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.
Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |
September 30, 2024 |  | 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 |  | $ | 7,982 |  | $ | 17 |  |  | $ | 7,545 |  | $ | 1,354 |  |  | $ | 15,527 |  | $ | 1,371 |
Municipal obligations |  |  | 2,820 |  |  | — |  |  |  | 174,748 |  |  | 1,824 |  |  |  | 177,568 |  |  | 1,824 |
Residential mortgage-backed securities |  |  | 38,596 |  |  | 72 |  |  |  | 1,674,765 |  |  | 280,324 |  |  |  | 1,713,361 |  |  | 280,396 |
Commercial mortgage-backed securities |  |  | — |  |  | — |  |  |  | 2,246,784 |  |  | 185,916 |  |  |  | 2,246,784 |  |  | 185,916 |
Collateralized mortgage obligations |  |  | — |  |  | — |  |  |  | 37,986 |  |  | 1,964 |  |  |  | 37,986 |  |  | 1,964 |
Corporate debt securities |  |  | — |  |  | — |  |  |  | 19,454 |  |  | 2,046 |  |  |  | 19,454 |  |  | 2,046 |
Total |  | $ | 49,398 |  | $ | 89 |  |  | $ | 4,161,282 |  | $ | 473,428 |  |  | $ | 4,210,680 |  | $ | 473,517 |
Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2023 |  | 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 |  | $ | — |  | $ | — |  |  | $ | 7,790 |  | $ | 1,514 |  |  | $ | 7,790 |  | $ | 1,514 |
Municipal obligations |  |  | 49,832 |  |  | 374 |  |  |  | 128,965 |  |  | 1,826 |  |  |  | 178,797 |  |  | 2,200 |
Residential mortgage-backed securities |  |  | 3,062 |  |  | 25 |  |  |  | 1,795,154 |  |  | 329,254 |  |  |  | 1,798,216 |  |  | 329,279 |
Commercial mortgage-backed securities |  |  | — |  |  | — |  |  |  | 2,227,703 |  |  | 253,576 |  |  |  | 2,227,703 |  |  | 253,576 |
Collateralized mortgage obligations |  |  | — |  |  | — |  |  |  | 44,285 |  |  | 3,376 |  |  |  | 44,285 |  |  | 3,376 |
Corporate debt securities |  |  | — |  |  | — |  |  |  | 19,852 |  |  | 3,148 |  |  |  | 19,852 |  |  | 3,148 |
Total |  | $ | 52,894 |  | $ | 399 |  |  | $ | 4,223,749 |  | $ | 592,694 |  |  | $ | 4,276,643 |  | $ | 593,093 |
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 |  | $ | 95,237 |  |  | $ | 94,381 |
Due after one year through five years |  |  | 791,983 |  |  |  | 763,985 |
Due after five years through ten years |  |  | 581,877 |  |  |  | 554,189 |
Due after ten years |  |  | 1,004,536 |  |  |  | 912,703 |
Total held to maturity securities |  | $ | 2,473,633 |  |  | $ | 2,325,258 |
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.
Held to Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
September 30, 2024 |  | 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 |  | $ | — |  | $ | — |  |  | $ | 336,218 |  | $ | 34,673 |  |  | $ | 336,218 |  | $ | 34,673 |
Municipal obligations |  |  | 21,719 |  |  | 53 |  |  |  | 498,414 |  |  | 15,202 |  |  |  | 520,133 |  |  | 15,255 |
Residential mortgage-backed securities |  |  | — |  |  | — |  |  |  | 549,890 |  |  | 43,613 |  |  |  | 549,890 |  |  | 43,613 |
Commercial mortgage-backed securities |  |  | — |  |  | — |  |  |  | 769,197 |  |  | 55,404 |  |  |  | 769,197 |  |  | 55,404 |
Collateralized mortgage obligations |  |  | — |  |  | — |  |  |  | 26,044 |  |  | 1,006 |  |  |  | 26,044 |  |  | 1,006 |
Total |  | $ | 21,719 |  | $ | 53 |  |  | $ | 2,179,763 |  | $ | 149,898 |  |  | $ | 2,201,482 |  | $ | 149,951 |
Held to Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2023 |  | 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 |  | $ | 9,530 |  | $ | 63 |  |  | $ | 339,533 |  | $ | 43,908 |  |  | $ | 349,063 |  | $ | 43,971 |
Municipal obligations |  |  | 343,401 |  |  | 1,801 |  |  |  | 226,165 |  |  | 17,792 |  |  |  | 569,566 |  |  | 19,593 |
Residential mortgage-backed securities |  |  | — |  |  | — |  |  |  | 595,039 |  |  | 59,223 |  |  |  | 595,039 |  |  | 59,223 |
Commercial mortgage-backed securities |  |  | — |  |  | — |  |  |  | 844,245 |  |  | 75,803 |  |  |  | 844,245 |  |  | 75,803 |
Collateralized mortgage obligations |  |  | — |  |  | — |  |  |  | 30,789 |  |  | 1,702 |  |  |  | 30,789 |  |  | 1,702 |
Total |  | $ | 352,931 |  | $ | 1,864 |  |  | $ | 2,035,771 |  | $ | 198,428 |  |  | $ | 2,388,702 |  | $ | 200,292 |

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