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Securities (Tables) | 6 Months Ended
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Jun. 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 |
| June 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 | $ | 135,826 |  | $ | 852 |  | $ | 1,757 |  | $ | 134,921 |  | $ | 97,741 |  | $ | 1,581 |  | $ | 1,514 |  | $ | 97,808 |
Municipal obligations |  | 201,894 |  |  | — |  |  | 5,422 |  |  | 196,472 |  |  | 203,533 |  |  | 79 |  |  | 2,200 |  |  | 201,412 |
Residential mortgage-backed securities |  | 2,420,963 |  |  | 77 |  |  | 361,908 |  |  | 2,059,132 |  |  | 2,440,411 |  |  | 2,734 |  |  | 329,279 |  |  | 2,113,866 |
Commercial mortgage-backed securities |  | 2,781,190 |  |  | 2,349 |  |  | 268,939 |  |  | 2,514,600 |  |  | 2,683,872 |  |  | 7,176 |  |  | 253,576 |  |  | 2,437,472 |
Collateralized mortgage obligations |  | 42,476 |  |  | — |  |  | 3,122 |  |  | 39,354 |  |  | 47,661 |  |  | — |  |  | 3,376 |  |  | 44,285 |
Corporate debt securities |  | 23,500 |  |  | — |  |  | 2,765 |  |  | 20,735 |  |  | 23,500 |  |  | — |  |  | 3,148 |  |  | 20,352 |
Total | $ | 5,605,849 |  | $ | 3,278 |  | $ | 643,913 |  | $ | 4,965,214 |  | $ | 5,496,718 |  | $ | 11,570 |  | $ | 593,093 |  | $ | 4,915,195 |
Amortized Cost and Fair Value of Debt Securities Held to Maturity |
| June 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 | $ | 404,468 |  | $ | 19 |  | $ | 48,562 |  | $ | 355,925 |  | $ | 413,490 |  | $ | 179 |  | $ | 43,971 |  | $ | 369,698 |
Municipal obligations |  | 630,812 |  |  | 369 |  |  | 25,348 |  |  | 605,833 |  |  | 664,488 |  |  | 1,252 |  |  | 19,593 |  |  | 646,147 |
Residential mortgage-backed securities |  | 614,200 |  |  | — |  |  | 65,661 |  |  | 548,539 |  |  | 654,262 |  |  | — |  |  | 59,223 |  |  | 595,039 |
Commercial mortgage-backed securities |  | 892,436 |  |  | — |  |  | 81,803 |  |  | 810,633 |  |  | 920,048 |  |  | — |  |  | 75,803 |  |  | 844,245 |
Collateralized mortgage obligations |  | 28,706 |  |  | — |  |  | 1,679 |  |  | 27,027 |  |  | 32,491 |  |  | — |  |  | 1,702 |  |  | 30,789 |
Total | $ | 2,570,622 |  | $ | 388 |  | $ | 223,053 |  | $ | 2,347,957 |  | $ | 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 |  | $ | 101,999 |  |  | $ | 101,229 |
Due after one year through five years |  |  | 814,705 |  |  |  | 779,834 |
Due after five years through ten years |  |  | 2,344,169 |  |  |  | 2,092,416 |
Due after ten years |  |  | 2,344,976 |  |  |  | 1,991,735 |
Total available for sale debt securities |  | $ | 5,605,849 |  |  | $ | 4,965,214 |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
June 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 |  | $ | 77,053 |  |  | $ | 98 |  |  | $ | 7,442 |  |  | $ | 1,659 |  |  | $ | 84,495 |  |  | $ | 1,757 |
Municipal obligations |  |  | 21,941 |  |  |  | 400 |  |  |  | 174,531 |  |  |  | 5,022 |  |  |  | 196,472 |  |  |  | 5,422 |
Residential mortgage-backed securities |  |  | 397,674 |  |  |  | 1,359 |  |  |  | 1,656,654 |  |  |  | 360,549 |  |  |  | 2,054,328 |  |  |  | 361,908 |
Commercial mortgage-backed securities |  |  | 82,884 |  |  |  | 734 |  |  |  | 2,188,381 |  |  |  | 268,205 |  |  |  | 2,271,265 |  |  |  | 268,939 |
Collateralized mortgage obligations |  |  | — |  |  |  | — |  |  |  | 39,353 |  |  |  | 3,122 |  |  |  | 39,353 |  |  |  | 3,122 |
Corporate debt securities |  |  | 2,000 |  |  |  | — |  |  |  | 18,735 |  |  |  | 2,765 |  |  |  | 20,735 |  |  |  | 2,765 |
Total |  | $ | 581,552 |  |  | $ | 2,591 |  |  | $ | 4,085,096 |  |  | $ | 641,322 |  |  | $ | 4,666,648 |  |  | $ | 643,913 |
Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2023 |  | Losses < 12 months |  |  | Losses 12 months or > |  |  | Total |
|  |  |  | Gross |  |  |  |  | Gross |  |  |  |  | Gross |
|  | Fair |  | unrealized |  |  | Fair |  | unrealized |  |  | Fair |  | unrealized |
($ in thousands) |  | value |  | losses |  |  | value |  | losses |  |  | value |  | 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 |  | $ | 158,621 |  |  | $ | 156,501 |
Due after one year through five years |  |  | 790,154 |  |  |  | 740,272 |
Due after five years through ten years |  |  | 569,629 |  |  |  | 530,008 |
Due after ten years |  |  | 1,052,218 |  |  |  | 921,176 |
Total held to maturity securities |  | $ | 2,570,622 |  |  | $ | 2,347,957 |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
June 30, 2024 |  | Losses < 12 months |  |  | Losses 12 months or > |  |  | Total |
|  |  |  | Gross |  |  |  |  | Gross |  |  |  |  | Gross |
|  | Fair |  | unrealized |  |  | Fair |  | unrealized |  |  | Fair |  | unrealized |
($ in thousands) |  | value |  | losses |  |  | value |  | losses |  |  | value |  | losses |
U.S. Treasury and government agency securities |  | $ | 10,408 |  | $ | 136 |  |  | $ | 336,035 |  | $ | 48,426 |  |  | $ | 346,443 |  | $ | 48,562 |
Municipal obligations |  |  | 52,420 |  |  | 583 |  |  |  | 531,341 |  |  | 24,765 |  |  |  | 583,761 |  |  | 25,348 |
Residential mortgage-backed securities |  |  | — |  |  | — |  |  |  | 548,539 |  |  | 65,661 |  |  |  | 548,539 |  |  | 65,661 |
Commercial mortgage-backed securities |  |  | — |  |  | — |  |  |  | 810,633 |  |  | 81,803 |  |  |  | 810,633 |  |  | 81,803 |
Collateralized mortgage obligations |  |  | — |  |  | — |  |  |  | 27,027 |  |  | 1,679 |  |  |  | 27,027 |  |  | 1,679 |
Total |  | $ | 62,828 |  | $ | 719 |  |  | $ | 2,253,575 |  | $ | 222,334 |  |  | $ | 2,316,403 |  | $ | 223,053 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2023 |  | Losses < 12 months |  |  | Losses 12 months or > |  |  | Total |
|  |  |  | Gross |  |  |  |  | Gross |  |  |  |  | Gross |
|  | Fair |  | unrealized |  |  | Fair |  | unrealized |  |  | Fair |  | unrealized |
($ in thousands) |  | value |  | losses |  |  | value |  | losses |  |  | value |  | 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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