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Securities (Tables) | 3 Months Ended
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Mar. 31, 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 |
| March 31, 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 | $ | 114,086 |  | $ | 722 |  | $ | 1,670 |  | $ | 113,138 |  | $ | 97,741 |  | $ | 1,581 |  | $ | 1,514 |  | $ | 97,808 |
Municipal obligations |  | 202,764 |  |  | — |  |  | 3,730 |  |  | 199,034 |  |  | 203,533 |  |  | 79 |  |  | 2,200 |  |  | 201,412 |
Residential mortgage-backed securities |  | 2,401,546 |  |  | 743 |  |  | 357,044 |  |  | 2,045,245 |  |  | 2,440,411 |  |  | 2,734 |  |  | 329,279 |  |  | 2,113,866 |
Commercial mortgage-backed securities |  | 2,748,086 |  |  | 3,528 |  |  | 265,878 |  |  | 2,485,736 |  |  | 2,683,872 |  |  | 7,176 |  |  | 253,576 |  |  | 2,437,472 |
Collateralized mortgage obligations |  | 45,230 |  |  | — |  |  | 3,357 |  |  | 41,873 |  |  | 47,661 |  |  | — |  |  | 3,376 |  |  | 44,285 |
Corporate debt securities |  | 23,500 |  |  | — |  |  | 3,103 |  |  | 20,397 |  |  | 23,500 |  |  | — |  |  | 3,148 |  |  | 20,352 |
Total | $ | 5,535,212 |  | $ | 4,993 |  | $ | 634,782 |  | $ | 4,905,423 |  | $ | 5,496,718 |  | $ | 11,570 |  | $ | 593,093 |  | $ | 4,915,195 |
Amortized Cost and Fair Value of Debt Securities Held to Maturity |
| March 31, 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 | $ | 409,435 |  | $ | — |  | $ | 48,083 |  | $ | 361,352 |  | $ | 413,490 |  | $ | 179 |  | $ | 43,971 |  | $ | 369,698 |
Municipal obligations |  | 660,372 |  |  | 739 |  |  | 23,185 |  |  | 637,926 |  |  | 664,488 |  |  | 1,252 |  |  | 19,593 |  |  | 646,147 |
Residential mortgage-backed securities |  | 636,208 |  |  | — |  |  | 64,540 |  |  | 571,668 |  |  | 654,262 |  |  | — |  |  | 59,223 |  |  | 595,039 |
Commercial mortgage-backed securities |  | 917,008 |  |  | — |  |  | 80,280 |  |  | 836,728 |  |  | 920,048 |  |  | — |  |  | 75,803 |  |  | 844,245 |
Collateralized mortgage obligations |  | 30,736 |  |  | — |  |  | 1,800 |  |  | 28,936 |  |  | 32,491 |  |  | — |  |  | 1,702 |  |  | 30,789 |
Total | $ | 2,653,759 |  | $ | 739 |  | $ | 217,888 |  | $ | 2,436,610 |  | $ | 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 |  | $ | 106,858 |  |  | $ | 105,620 |
Due after one year through five years |  |  | 585,990 |  |  |  | 566,852 |
Due after five years through ten years |  |  | 2,549,295 |  |  |  | 2,287,101 |
Due after ten years |  |  | 2,293,069 |  |  |  | 1,945,850 |
Total available for sale debt securities |  | $ | 5,535,212 |  |  | $ | 4,905,423 |
Securities with Unrealized Losses |
Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
March 31, 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 |  | $ | 11,973 |  |  | $ | 27 |  |  | $ | 7,460 |  |  | $ | 1,643 |  |  | $ | 19,433 |  |  | $ | 1,670 |
Municipal obligations |  |  | 19,549 |  |  |  | 118 |  |  |  | 176,664 |  |  |  | 3,612 |  |  |  | 196,213 |  |  |  | 3,730 |
Residential mortgage-backed securities |  |  | 31,818 |  |  |  | 86 |  |  |  | 1,717,118 |  |  |  | 356,958 |  |  |  | 1,748,936 |  |  |  | 357,044 |
Commercial mortgage-backed securities |  |  | 35,700 |  |  |  | 211 |  |  |  | 2,195,760 |  |  |  | 265,667 |  |  |  | 2,231,460 |  |  |  | 265,878 |
Collateralized mortgage obligations |  |  | — |  |  |  | — |  |  |  | 41,873 |  |  |  | 3,357 |  |  |  | 41,873 |  |  |  | 3,357 |
Corporate debt securities |  |  | — |  |  |  | — |  |  |  | 18,397 |  |  |  | 3,103 |  |  |  | 18,397 |  |  |  | 3,103 |
Total |  | $ | 99,040 |  |  | $ | 442 |  |  | $ | 4,157,272 |  |  | $ | 634,340 |  |  | $ | 4,256,312 |  |  | $ | 634,782 |
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 |  | $ | 92,336 |  |  | $ | 91,307 |
Due after one year through five years |  |  | 734,660 |  |  |  | 696,030 |
Due after five years through ten years |  |  | 716,536 |  |  |  | 666,275 |
Due after ten years |  |  | 1,110,227 |  |  |  | 982,998 |
Total held to maturity securities |  | $ | 2,653,759 |  |  | $ | 2,436,610 |
Securities with Unrealized Losses |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
March 31, 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 |  | $ | 29,579 |  | $ | 316 |  |  | $ | 331,773 |  | $ | 47,767 |  |  | $ | 361,352 |  | $ | 48,083 |
Municipal obligations |  |  | 71,115 |  |  | 495 |  |  |  | 544,326 |  |  | 22,690 |  |  |  | 615,441 |  |  | 23,185 |
Residential mortgage-backed securities |  |  | — |  |  | — |  |  |  | 571,669 |  |  | 64,540 |  |  |  | 571,669 |  |  | 64,540 |
Commercial mortgage-backed securities |  |  | — |  |  | — |  |  |  | 836,727 |  |  | 80,280 |  |  |  | 836,727 |  |  | 80,280 |
Collateralized mortgage obligations |  |  | — |  |  | — |  |  |  | 28,936 |  |  | 1,800 |  |  |  | 28,936 |  |  | 1,800 |
Total |  | $ | 100,694 |  | $ | 811 |  |  | $ | 2,313,431 |  | $ | 217,077 |  |  | $ | 2,414,125 |  | $ | 217,888 |
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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