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Segment Reporting - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Statement Related Disclosures          
Net interest income (expense) $ 474,695 $ 440,740   $ 1,388,640 $ 1,294,583
Provision for (reversal of) credit losses 21,690 23,434   35,855 103,818
Net interest income after provision for (reversal of) credit losses 453,005 417,306   1,352,785 1,190,765
Non-interest revenue:          
Service charges on deposit accounts 26,303 23,683   74,675 68,403
Fiduciary and asset management fees 21,039 19,714   61,288 58,455
Card fees 19,894 18,439   61,253 57,343
Brokerage revenue 21,673 20,810   62,779 63,974
Mortgage banking income 4,374 4,033   12,147 11,395
Capital markets income 13,944 10,284   33,845 31,988
Other non-interest revenue 33,470 27,017   85,310 (177,541)
Total non-interest revenue 140,697 123,980   391,297 114,017
Non-interest expense:          
Salaries and other personnel expense 197,313 184,814   575,006 552,742
Other operating expense 151,416 128,876   397,458 385,490
Total non-interest expense 348,729 313,690   972,464 938,232
Income before income taxes 244,973 227,596   771,618 366,550
Merger-related expense 23,757 0   23,757 0
Investment securities gains (losses), net 1,742 0   1,742 (256,660)
Operating Segments | Wholesale Banking          
Income Statement Related Disclosures          
Net interest income (expense) 186,300 181,596   539,546 546,836
Provision for (reversal of) credit losses 28,368 31,313   90,683 91,616
Net interest income after provision for (reversal of) credit losses 157,932 150,283   448,863 455,220
Non-interest revenue:          
Service charges on deposit accounts 5,943 5,399   17,511 15,759
Fiduciary and asset management fees 0 0   0 0
Card fees 3 3   8 8
Brokerage revenue 0 0   0 0
Mortgage banking income 0 0   0 0
Capital markets income 10,986 6,906   22,034 18,271
Other non-interest revenue 4,948 2,637   11,999 8,178
Total non-interest revenue 21,880 14,945   51,552 42,216
Non-interest expense:          
Salaries and other personnel expense 23,474 21,514   72,762 69,269
Other operating expense 8,259 9,091   24,858 31,221
Total non-interest expense 31,733 30,605   97,620 100,490
Income before income taxes 148,079 134,623   402,795 396,946
Operating Segments | Community Banking          
Income Statement Related Disclosures          
Net interest income (expense) 105,612 100,910   303,784 298,030
Provision for (reversal of) credit losses 11,051 10,617   32,929 29,898
Net interest income after provision for (reversal of) credit losses 94,561 90,293   270,855 268,132
Non-interest revenue:          
Service charges on deposit accounts 7,642 7,373   22,654 20,823
Fiduciary and asset management fees 0 0   0 0
Card fees 8,894 7,363   28,005 23,612
Brokerage revenue 0 0   0 0
Mortgage banking income 0 0   0 0
Capital markets income 1,622 1,815   4,253 5,306
Other non-interest revenue 724 763   2,567 2,403
Total non-interest revenue 18,882 17,314   57,479 52,144
Non-interest expense:          
Salaries and other personnel expense 26,369 25,543   81,266 80,606
Other operating expense 11,092 12,267   32,918 35,983
Total non-interest expense 37,461 37,810   114,184 116,589
Income before income taxes 75,982 69,797   214,150 203,687
Operating Segments | Consumer Banking          
Income Statement Related Disclosures          
Net interest income (expense) 136,631 136,329   400,499 410,506
Provision for (reversal of) credit losses 5,248 5,263   15,895 15,339
Net interest income after provision for (reversal of) credit losses 131,383 131,066   384,604 395,167
Non-interest revenue:          
Service charges on deposit accounts 12,216 10,520   32,889 30,960
Fiduciary and asset management fees 0 0   0 0
Card fees 6,729 6,671   19,955 19,734
Brokerage revenue 0 0   0 0
Mortgage banking income 0 0   0 0
Capital markets income 0 0   226 0
Other non-interest revenue 1,486 1,787   5,061 5,538
Total non-interest revenue 20,431 18,978   58,131 56,232
Non-interest expense:          
Salaries and other personnel expense 31,363 30,260   91,945 90,002
Other operating expense 17,970 19,282   53,787 63,351
Total non-interest expense 49,333 49,542   145,732 153,353
Income before income taxes 102,481 100,502   297,003 298,046
Operating Segments | Financial Management Services          
Income Statement Related Disclosures          
Net interest income (expense) 21,882 26,813   64,711 75,283
Provision for (reversal of) credit losses 3,995 4,082   12,035 11,868
Net interest income after provision for (reversal of) credit losses 17,887 22,731   52,676 63,415
Non-interest revenue:          
Service charges on deposit accounts 4 5   12 13
Fiduciary and asset management fees 21,039 19,714   61,288 58,455
Card fees 0 0   0 0
Brokerage revenue 21,673 20,810   62,779 63,974
Mortgage banking income 4,374 4,033   12,147 11,395
Capital markets income 38 0   342 430
Other non-interest revenue 1,569 1,884   4,973 4,888
Total non-interest revenue 48,697 46,446   141,541 139,155
Non-interest expense:          
Salaries and other personnel expense 31,679 30,214   94,423 93,772
Other operating expense 7,807 7,727   23,943 22,198
Total non-interest expense 39,486 37,941   118,366 115,970
Income before income taxes 27,098 31,236   75,851 86,600
Treasury and Corporate Other          
Income Statement Related Disclosures          
Net interest income (expense) 24,270 (4,908)   80,100 (36,072)
Provision for (reversal of) credit losses (26,972) (27,841)   (115,687) (44,903)
Net interest income after provision for (reversal of) credit losses 51,242 22,933   195,787 8,831
Non-interest revenue:          
Service charges on deposit accounts 498 386   1,609 848
Fiduciary and asset management fees 0 0   0 0
Card fees 4,268 4,402   13,285 13,989
Brokerage revenue 0 0   0 0
Mortgage banking income 0 0   0 0
Capital markets income 1,298 1,563   6,990 7,981
Other non-interest revenue 24,743 19,946   60,710 (198,548)
Total non-interest revenue 30,807 26,297   82,594 (175,730)
Non-interest expense:          
Salaries and other personnel expense 84,428 77,283   234,610 219,093
Other operating expense 106,288 80,509   261,952 232,737
Total non-interest expense 190,716 157,792   496,562 451,830
Income before income taxes (108,667) $ (108,562)   $ (218,181) $ (618,729)
Investment securities gains (losses), net     $ (256,700)    
Treasury and Corporate Other | Pinnacle          
Non-interest expense:          
Merger-related expense $ 23,800