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Loans and Allowance for Credit Losses for Loans - Internal Loan Classification Risk by Loan Portfolio Class by Origination Year (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]          
Total $ 49,391,420   $ 49,391,420   $ 48,799,711
Gross loan charge-offs          
Total 42,071 $ 38,339 86,090 $ 63,239  
Commercial and industrial          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 901,078   901,078   1,824,953
Year two, fiscal year before current fiscal year 1,607,140   1,607,140   854,030
Year three, two years before current fiscal year 826,398   826,398   772,815
Year four, three years before current fiscal year 665,363   665,363   492,961
Year five, four years before current fiscal year 402,610   402,610   250,075
More than five years before current fiscal year 720,154   720,154   524,794
Revolving Loans Amortized Cost Basis 5,713,178   5,713,178   5,155,993
Revolving Loans Converted to Term Loans 34,115   34,115   55,779
Total 10,870,036   10,870,036   9,931,400
Gross loan charge-offs          
Total 25,189 14,721 53,645 29,014  
Commercial and industrial | Pass          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 899,962   899,962   1,769,585
Year two, fiscal year before current fiscal year 1,579,211   1,579,211   828,087
Year three, two years before current fiscal year 784,023   784,023   703,962
Year four, three years before current fiscal year 594,156   594,156   476,091
Year five, four years before current fiscal year 378,487   378,487   246,992
More than five years before current fiscal year 602,119   602,119   392,834
Revolving Loans Amortized Cost Basis 5,322,292   5,322,292   4,804,095
Revolving Loans Converted to Term Loans 8,655   8,655   6,006
Total 10,168,905   10,168,905   9,227,652
Commercial and industrial | Special Mention          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 1,116   1,116   30,755
Year two, fiscal year before current fiscal year 1,566   1,566   3,553
Year three, two years before current fiscal year 12,373   12,373   59,434
Year four, three years before current fiscal year 8,970   8,970   11,646
Year five, four years before current fiscal year 20,015   20,015   270
More than five years before current fiscal year 5,316   5,316   72,514
Revolving Loans Amortized Cost Basis 169,498   169,498   147,254
Revolving Loans Converted to Term Loans 4,699   4,699   10,762
Total 223,553   223,553   336,188
Commercial and industrial | Substandard          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 0   0   24,613
Year two, fiscal year before current fiscal year 26,363   26,363   13,479
Year three, two years before current fiscal year 23,749   23,749   9,415
Year four, three years before current fiscal year 62,235   62,235   4,296
Year five, four years before current fiscal year 3,787   3,787   2,813
More than five years before current fiscal year 63,259   63,259   7,382
Revolving Loans Amortized Cost Basis 218,750   218,750   201,053
Revolving Loans Converted to Term Loans 20,761   20,761   39,011
Total 418,904   418,904   302,062
Commercial and industrial | Doubtful          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 0   0   0
Year two, fiscal year before current fiscal year 0   0   8,911
Year three, two years before current fiscal year 6,253   6,253   4
Year four, three years before current fiscal year 2   2   928
Year five, four years before current fiscal year 321   321   0
More than five years before current fiscal year 49,460   49,460   52,064
Revolving Loans Amortized Cost Basis 2,638   2,638   3,591
Revolving Loans Converted to Term Loans 0   0   0
Total 58,674   58,674   65,498
Commercial real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 28,825,920   28,825,920   29,644,958
Gross loan charge-offs          
Total 14,623 $ 22,356 28,046 $ 31,154  
Commercial real estate | Commercial real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 907,880   907,880   2,338,118
Year two, fiscal year before current fiscal year 2,244,084   2,244,084   3,433,126
Year three, two years before current fiscal year 3,100,906   3,100,906   5,988,114
Year four, three years before current fiscal year 5,739,935   5,739,935   4,400,609
Year five, four years before current fiscal year 4,086,600   4,086,600   2,604,959
More than five years before current fiscal year 9,116,669   9,116,669   6,937,081
Revolving Loans Amortized Cost Basis 721,125   721,125   749,597
Revolving Loans Converted to Term Loans 53,862   53,862   78,621
Total 25,971,061   25,971,061   26,530,225
Commercial real estate | Commercial real estate | Pass          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 906,097   906,097   2,097,314
Year two, fiscal year before current fiscal year 2,046,206   2,046,206   2,941,270
Year three, two years before current fiscal year 2,631,836   2,631,836   5,310,807
Year four, three years before current fiscal year 5,034,673   5,034,673   3,883,333
Year five, four years before current fiscal year 3,508,472   3,508,472   2,302,480
More than five years before current fiscal year 7,948,426   7,948,426   6,086,608
Revolving Loans Amortized Cost Basis 493,466   493,466   597,266
Revolving Loans Converted to Term Loans 53,795   53,795   78,621
Total 22,622,971   22,622,971   23,297,699
Commercial real estate | Commercial real estate | Special Mention          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 1,783   1,783   156,394
Year two, fiscal year before current fiscal year 131,233   131,233   380,852
Year three, two years before current fiscal year 262,912   262,912   289,669
Year four, three years before current fiscal year 291,603   291,603   192,614
Year five, four years before current fiscal year 149,396   149,396   55,739
More than five years before current fiscal year 251,288   251,288   327,732
Revolving Loans Amortized Cost Basis 150,586   150,586   141,164
Revolving Loans Converted to Term Loans 0   0   0
Total 1,238,801   1,238,801   1,544,164
Commercial real estate | Commercial real estate | Substandard          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 0   0   84,410
Year two, fiscal year before current fiscal year 66,645   66,645   107,944
Year three, two years before current fiscal year 203,098   203,098   387,638
Year four, three years before current fiscal year 413,659   413,659   288,906
Year five, four years before current fiscal year 399,249   399,249   236,927
More than five years before current fiscal year 906,389   906,389   520,858
Revolving Loans Amortized Cost Basis 77,073   77,073   11,167
Revolving Loans Converted to Term Loans 67   67   0
Total 2,066,180   2,066,180   1,637,850
Commercial real estate | Commercial real estate | Doubtful          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 0   0   0
Year two, fiscal year before current fiscal year 0   0   3,060
Year three, two years before current fiscal year 3,060   3,060   0
Year four, three years before current fiscal year 0   0   35,756
Year five, four years before current fiscal year 29,483   29,483   9,813
More than five years before current fiscal year 10,566   10,566   1,883
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term Loans 0   0   0
Total 43,109   43,109   50,512
Commercial real estate | Construction          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 283,613   283,613   568,710
Year two, fiscal year before current fiscal year 576,857   576,857   680,260
Year three, two years before current fiscal year 502,805   502,805   346,587
Year four, three years before current fiscal year 333,265   333,265   102,776
Year five, four years before current fiscal year 93,676   93,676   25,228
More than five years before current fiscal year 64,417   64,417   47,665
Revolving Loans Amortized Cost Basis 942,564   942,564   1,284,863
Revolving Loans Converted to Term Loans 57,662   57,662   58,644
Total 2,854,859   2,854,859   3,114,733
Commercial real estate | Construction | Pass          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 283,613   283,613   545,597
Year two, fiscal year before current fiscal year 565,391   565,391   680,260
Year three, two years before current fiscal year 447,756   447,756   334,899
Year four, three years before current fiscal year 322,573   322,573   92,765
Year five, four years before current fiscal year 64,401   64,401   17,955
More than five years before current fiscal year 53,919   53,919   45,161
Revolving Loans Amortized Cost Basis 775,127   775,127   1,224,698
Revolving Loans Converted to Term Loans 17,671   17,671   58,644
Total 2,530,451   2,530,451   2,999,979
Commercial real estate | Construction | Special Mention          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 0   0   13,278
Year two, fiscal year before current fiscal year 10,895   10,895   0
Year three, two years before current fiscal year 21,510   21,510   664
Year four, three years before current fiscal year 1,742   1,742   5,069
Year five, four years before current fiscal year 23,047   23,047   0
More than five years before current fiscal year 1,969   1,969   2,504
Revolving Loans Amortized Cost Basis 96,667   96,667   16,691
Revolving Loans Converted to Term Loans 7,048   7,048   0
Total 162,878   162,878   38,206
Commercial real estate | Construction | Substandard          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 0   0   9,835
Year two, fiscal year before current fiscal year 571   571   0
Year three, two years before current fiscal year 33,539   33,539   8,950
Year four, three years before current fiscal year 8,950   8,950   4,942
Year five, four years before current fiscal year 6,228   6,228   0
More than five years before current fiscal year 8,529   8,529   0
Revolving Loans Amortized Cost Basis 70,770   70,770   43,474
Revolving Loans Converted to Term Loans 32,943   32,943   0
Total $ 161,530   161,530   67,201
Commercial real estate | Construction | Doubtful          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year         0
Year two, fiscal year before current fiscal year         0
Year three, two years before current fiscal year         2,074
Year four, three years before current fiscal year         0
Year five, four years before current fiscal year         7,273
More than five years before current fiscal year         0
Revolving Loans Amortized Cost Basis         0
Revolving Loans Converted to Term Loans         0
Total         9,347
Commercial and Industrial and Commercial Real Estate          
Gross loan charge-offs          
Year one, gross loan charge-offs     0   706
Year two, gross loan charge-offs     6,503   31,809
Year three, gross loan charge-offs     3,328   7,523
Year four, gross loan charge-offs     4,109   44,610
Year five, gross loan charge-offs     13,657   66,632
More than five years gross loan charge-offs     15,654   49,436
Revolving Loans Amortized Cost Basis     23,450   3,930
Revolving Loans Converted to Term Loans     14,990   2,148
Total     $ 81,691   $ 206,794