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Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
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 |
Securities Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| December 31,2022 |  | December 31,2021 |
|  |  | Gross |  | Gross |  |  |  |  |  | Gross |  | Gross |  |  |
| 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 | $ | 113,211 |  | $ | — |  | $ | 2,346 |  | $ | 110,865 |  | $ | 420,857 |  | $ | 3,781 |  | $ | 5,340 |  | $ | 419,298 |
Municipal obligations |  | 207,014 |  |  | 59 |  |  | 3,981 |  |  | 203,092 |  |  | 304,536 |  |  | 13,184 |  |  | 3,562 |  |  | 314,158 |
Residential mortgage-backed securities |  | 2,655,381 |  |  | 224 |  |  | 398,619 |  |  | 2,256,986 |  |  | 3,056,763 |  |  | 29,158 |  |  | 50,123 |  |  | 3,035,798 |
Commercial mortgage-backed securities |  | 3,234,278 |  |  | 2,032 |  |  | 342,880 |  |  | 2,893,430 |  |  | 3,064,828 |  |  | 61,645 |  |  | 48,614 |  |  | 3,077,859 |
Collateralized mortgage obligations |  | 76,830 |  |  | — |  |  | 6,242 |  |  | 70,588 |  |  | 119,046 |  |  | 1,837 |  |  | — |  |  | 120,883 |
Corporate debt securities |  | 23,500 |  |  | — |  |  | 2,420 |  |  | 21,080 |  |  | 18,500 |  |  | 210 |  |  | 8 |  |  | 18,702 |
| $ | 6,310,214 |  | $ | 2,315 |  | $ | 756,488 |  | $ | 5,556,041 |  | $ | 6,984,530 |  | $ | 109,815 |  | $ | 107,647 |  | $ | 6,986,698 |
Amortized Cost and Fair Value of Debt Securities Held to Maturity |
Securities Held to Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| December 31,2022 |  | December 31,2021 |
|  |  | Gross |  | Gross |  |  |  |  |  | Gross |  | Gross |  |  |
| 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 | $ | 426,454 |  | $ | 21 |  | $ | 49,044 |  | $ | 377,431 |  | $ | 14,857 |  | $ | — |  | $ | 20 |  | $ | 14,837 |
Municipal obligations |  | 698,908 |  |  | 753 |  |  | 26,558 |  |  | 673,103 |  |  | 621,405 |  |  | 37,941 |  |  | 205 |  |  | 659,141 |
Residential mortgage-backed securities |  | 734,478 |  |  | — |  |  | 72,532 |  |  | 661,946 |  |  | 268,907 |  |  | 682 |  |  | 1,499 |  |  | 268,090 |
Commercial mortgage-backed securities |  | 948,691 |  |  | — |  |  | 87,211 |  |  | 861,480 |  |  | 603,156 |  |  | 28,679 |  |  | 669 |  |  | 631,166 |
Collateralized mortgage obligations |  | 43,964 |  |  | — |  |  | 2,526 |  |  | 41,438 |  |  | 57,426 |  |  | 822 |  |  | — |  |  | 58,248 |
| $ | 2,852,495 |  | $ | 774 |  | $ | 237,871 |  | $ | 2,615,398 |  | $ | 1,565,751 |  | $ | 68,124 |  | $ | 2,393 |  | $ | 1,631,482 |
Proceeds from Gross Gains on and Gross Losses on Sale of Securities | The following table presents the proceeds from, gross gains on, and gross losses on sales of securities during the years ended December 31, 2022, 2021 and 2020. Net gains or losses are reflected in the "Securities transactions" line item on the Consolidated Statements of Income.
| Years Ended December 31, |
($ in thousands) | 2022 |  | 2021 |  | 2020 |
Proceeds | $ | 73,219 |  | $ | 198,681 |  | $ | 211,919 |
Gross gains |  | — |  |  | 1,649 |  |  | 1,984 |
Gross losses |  | 87 |  |  | 1,316 |  |  | 1,496 |
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 |
($ in thousands) | Amortized Cost |  | Fair Value |
Debt Securities Available for Sale |  |  |  |
Due in one year or less | $ | 112 |  | $ | 111 |
Due after one year through five years |  | 919,639 |  |  | 871,760 |
Due after five years through ten years |  | 2,982,549 |  |  | 2,665,232 |
Due after ten years |  | 2,407,914 |  |  | 2,018,938 |
Total available for sale debt securities | $ | 6,310,214 |  | $ | 5,556,041 |
Securities with Unrealized Losses |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |
| 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 | $ | 102,607 |  | $ | 754 |  | $ | 8,258 |  | $ | 1,592 |  | $ | 110,865 |  | $ | 2,346 |
Municipal obligations |  | 192,334 |  |  | 3,981 |  |  | — |  |  | — |  |  | 192,334 |  |  | 3,981 |
Residential mortgage-backed securities |  | 636,060 |  |  | 49,790 |  |  | 1,611,832 |  |  | 348,829 |  |  | 2,247,892 |  |  | 398,619 |
Commercial mortgage-backed securities |  | 1,489,974 |  |  | 114,195 |  |  | 1,351,530 |  |  | 228,685 |  |  | 2,841,504 |  |  | 342,880 |
Collateralized mortgage obligations |  | 41,703 |  |  | 3,275 |  |  | 28,884 |  |  | 2,967 |  |  | 70,587 |  |  | 6,242 |
Corporate debt securities |  | 13,194 |  |  | 1,306 |  |  | 7,386 |  |  | 1,114 |  |  | 20,580 |  |  | 2,420 |
. | $ | 2,475,872 |  | $ | 173,301 |  | $ | 3,007,890 |  | $ | 583,187 |  | $ | 5,483,762 |  | $ | 756,488 |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |
| 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 | $ | 198,318 |  | $ | 2,305 |  | $ | 63,534 |  | $ | 3,035 |  | $ | 261,852 |  | $ | 5,340 |
Municipal obligations |  | 43,021 |  |  | 2,372 |  |  | 25,126 |  |  | 1,190 |  |  | 68,147 |  |  | 3,562 |
Residential mortgage-backed securities |  | 1,293,179 |  |  | 20,581 |  |  | 819,596 |  |  | 29,541 |  |  | 2,112,775 |  |  | 50,122 |
Commercial mortgage-backed securities |  | 786,206 |  |  | 14,819 |  |  | 665,687 |  |  | 33,796 |  |  | 1,451,893 |  |  | 48,615 |
Collateralized mortgage obligations |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Corporate debt securities |  | 6,992 |  |  | 8 |  |  | — |  |  | — |  |  | 6,992 |  |  | 8 |
| $ | 2,327,716 |  | $ | 40,085 |  | $ | 1,573,943 |  | $ | 67,562 |  | $ | 3,901,659 |  | $ | 107,647 |
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 |
($ in thousands) | Amortized Cost |  | Fair Value |
Debt Securities Held to Maturity |  |  |  |
Due in one year or less | $ | 10,000 |  | $ | 9,924 |
Due after one year through five years |  | 544,146 |  |  | 522,347 |
Due after five years through ten years |  | 893,562 |  |  | 813,726 |
Due after ten years |  | 1,404,787 |  |  | 1,269,401 |
Total held to maturity debt securities | $ | 2,852,495 |  | $ | 2,615,398 |
Securities with Unrealized Losses |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |
| 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 | $ | 145,893 |  | $ | 13,245 |  | $ | 226,499 |  | $ | 35,799 |  | $ | 372,392 |  | $ | 49,044 |
Municipal obligations |  | 560,288 |  |  | 8,878 |  |  | 64,346 |  |  | 17,680 |  |  | 624,634 |  |  | 26,558 |
Residential mortgage-backed securities |  | 391,146 |  |  | 30,515 |  |  | 270,800 |  |  | 42,017 |  |  | 661,946 |  |  | 72,532 |
Commercial mortgage-backed securities |  | 697,827 |  |  | 56,899 |  |  | 163,653 |  |  | 30,312 |  |  | 861,480 |  |  | 87,211 |
Collateralized mortgage obligations |  | 41,438 |  |  | 2,526 |  |  | — |  |  | — |  |  | 41,438 |  |  | 2,526 |
| $ | 1,836,592 |  | $ | 112,063 |  | $ | 725,298 |  | $ | 125,808 |  | $ | 2,561,890 |  | $ | 237,871 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |
| 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 | $ | 14,837 |  | $ | 20 |  | $ | — |  | $ | — |  | $ | 14,837 |  | $ | 20 |
Municipal obligations |  | 7,795 |  |  | 205 |  |  | — |  |  | — |  |  | 7,795 |  |  | 205 |
Residential mortgage-backed securities |  | 253,661 |  |  | 1,499 |  |  | — |  |  | — |  |  | 253,661 |  |  | 1,499 |
Commercial mortgage-backed securities |  | 56,366 |  |  | 205 |  |  | 11,837 |  |  | 464 |  |  | 68,203 |  |  | 669 |
Collateralized mortgage obligations |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
| $ | 332,659 |  | $ | 1,929 |  | $ | 11,837 |  | $ | 464 |  | $ | 344,496 |  | $ | 2,393 |

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