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Allowance for Credit Losses (Loan Portfolio by Credit Quality Indicator) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 $ 8,564,484   $ 8,564,484    
2022 7,252,803   7,252,803    
2021 5,667,743   5,667,743    
2020 3,373,713   3,373,713    
2019 2,640,351   2,640,351    
Prior 8,787,735   8,787,735    
Revolving 4,729,231   4,729,231    
Revolving to term 7,348   7,348    
Total Loans 41,023,408 $ 37,053,103 41,023,408 $ 37,053,103 $ 39,196,485
Three months ended June 30, 2023          
2023 4,963   5,441    
2022 569   5,462    
2021 1,055   2,249    
2020 5,159   5,496    
2019 5,014   5,332    
Prior 1,756   1,887    
Revolving 0   0    
Revolving to term 0   0    
Total loans 18,516 12,316 25,867 17,041  
Commercial, industrial and other          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 1,440,041   1,440,041    
2022 2,383,830   2,383,830    
2021 2,010,204   2,010,204    
2020 853,478   853,478    
2019 591,180   591,180    
Prior 1,144,241   1,144,241    
Revolving 4,172,175   4,172,175    
Revolving to term 5,322   5,322    
Total Loans 12,600,471   12,600,471    
Construction and development          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 137,138   137,138    
2022 630,254   630,254    
2021 480,750   480,750    
2020 217,976   217,976    
2019 133,762   133,762    
Prior 143,640   143,640    
Revolving 16,549   16,549    
Revolving to term 367   367    
Total Loans 1,760,436   1,760,436    
Non-construction          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 827,343   827,343    
2022 1,863,571   1,863,571    
2021 1,455,401   1,455,401    
2020 994,009   994,009    
2019 826,083   826,083    
Prior 2,686,478   2,686,478    
Revolving 194,075   194,075    
Revolving to term 1,415   1,415    
Total Loans 8,848,375   8,848,375    
Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0    
2022 230   230    
2021 140   140    
2020 115   115    
2019 170   170    
Prior 15,503   15,503    
Revolving 320,572   320,572    
Revolving to term 244   244    
Total Loans 336,974 325,826 336,974 325,826 332,698
Three months ended June 30, 2023          
Total loans 0 192 0 389  
Residential real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 255,281   255,281    
2022 833,977   833,977    
2021 817,113   817,113    
2020 233,982   233,982    
2019 138,459   138,459    
Prior 364,428   364,428    
Revolving 0   0    
Revolving to term 0   0    
Total Loans 2,643,240 2,078,907 2,643,240 2,078,907 2,372,383
Three months ended June 30, 2023          
Total loans 0 0 0 466  
Premium finance receivables - property and casualty          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 5,776,598   5,776,598    
2022 954,597   954,597    
2021 27,115   27,115    
2020 4,027   4,027    
2019 361   361    
Prior 0   0    
Revolving 0   0    
Revolving to term 0   0    
Total Loans 6,762,698   6,762,698    
Premium finance receivables - life          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 125,737   125,737    
2022 584,418   584,418    
2021 875,939   875,939    
2020 1,069,963   1,069,963    
2019 949,935   949,935    
Prior 4,433,281   4,433,281    
Revolving 0   0    
Revolving to term 0   0    
Total Loans 8,039,273   8,039,273    
Consumer and other          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 2,346   2,346    
2022 1,926   1,926    
2021 1,081   1,081    
2020 163   163    
2019 401   401    
Prior 164   164    
Revolving 25,860   25,860    
Revolving to term 0   0    
Total Loans 31,941 44,180 31,941 44,180 $ 50,836
Three months ended June 30, 2023          
Total loans 110 $ 253 263 $ 446  
Pass          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 8,415,552   8,415,552    
2022 7,115,976   7,115,976    
2021 5,507,661   5,507,661    
2020 3,295,495   3,295,495    
2019 2,501,393   2,501,393    
Prior 8,356,887   8,356,887    
Revolving 4,569,009   4,569,009    
Revolving to term 5,394   5,394    
Total Loans 39,767,367   39,767,367    
Pass | Commercial, industrial and other          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 1,432,042   1,432,042    
2022 2,302,642   2,302,642    
2021 1,892,615   1,892,615    
2020 842,764   842,764    
2019 536,136   536,136    
Prior 1,091,823   1,091,823    
Revolving 4,016,909   4,016,909    
Revolving to term 3,612   3,612    
Total Loans 12,118,543   12,118,543    
Pass | Construction and development          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 137,138   137,138    
2022 623,589   623,589    
2021 479,051   479,051    
2020 191,308   191,308    
2019 110,298   110,298    
Prior 115,876   115,876    
Revolving 16,549   16,549    
Revolving to term 367   367    
Total Loans 1,674,176   1,674,176    
Pass | Non-construction          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 824,864   824,864    
2022 1,857,052   1,857,052    
2021 1,423,876   1,423,876    
2020 972,603   972,603    
2019 788,128   788,128    
Prior 2,549,042   2,549,042    
Revolving 192,636   192,636    
Revolving to term 1,415   1,415    
Total Loans 8,609,616   8,609,616    
Pass | Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0    
2022 0   0    
2021 63   63    
2020 0   0    
2019 93   93    
Prior 6,207   6,207    
Revolving 317,066   317,066    
Revolving to term 0   0    
Total Loans 323,429   323,429    
Pass | Residential real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 254,659   254,659    
2022 827,009   827,009    
2021 809,152   809,152    
2020 221,005   221,005    
2019 116,043   116,043    
Prior 189,815   189,815    
Revolving 0   0    
Revolving to term 0   0    
Total Loans 2,417,683   2,417,683    
Pass | Premium finance receivables - property and casualty          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 5,638,768   5,638,768    
2022 919,368   919,368    
2021 26,646   26,646    
2020 4,012   4,012    
2019 361   361    
Prior 0   0    
Revolving 0   0    
Revolving to term 0   0    
Total Loans 6,589,155   6,589,155    
Pass | Premium finance receivables - life          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 125,737   125,737    
2022 584,412   584,412    
2021 875,181   875,181    
2020 1,063,640   1,063,640    
2019 949,935   949,935    
Prior 4,404,124   4,404,124    
Revolving 0   0    
Revolving to term 0   0    
Total Loans 8,003,029   8,003,029    
Pass | Consumer and other          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 2,344   2,344    
2022 1,904   1,904    
2021 1,077   1,077    
2020 163   163    
2019 399   399    
Prior 0   0    
Revolving 25,849   25,849    
Revolving to term 0   0    
Total Loans 31,736   31,736    
Special mention          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 137,529   137,529    
2022 70,190   70,190    
2021 104,397   104,397    
2020 31,797   31,797    
2019 64,992   64,992    
Prior 121,004   121,004    
Revolving 98,228   98,228    
Revolving to term 1,328   1,328    
Total Loans 629,465   629,465    
Special mention | Commercial, industrial and other          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 4,953   4,953    
2022 44,081   44,081    
2021 72,155   72,155    
2020 5,689   5,689    
2019 18,040   18,040    
Prior 6,820   6,820    
Revolving 94,418   94,418    
Revolving to term 1,328   1,328    
Total Loans 247,484   247,484    
Special mention | Construction and development          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0    
2022 0   0    
2021 1,699   1,699    
2020 18,420   18,420    
2019 20,000   20,000    
Prior 14,250   14,250    
Revolving 0   0    
Revolving to term 0   0    
Total Loans 54,369   54,369    
Special mention | Non-construction          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 2,479   2,479    
2022 5,088   5,088    
2021 28,536   28,536    
2020 0   0    
2019 26,357   26,357    
Prior 63,570   63,570    
Revolving 1,439   1,439    
Revolving to term 0   0    
Total Loans 127,469   127,469    
Special mention | Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0    
2022 230   230    
2021 0   0    
2020 0   0    
2019 59   59    
Prior 1,763   1,763    
Revolving 2,370   2,370    
Revolving to term 0   0    
Total Loans 4,422   4,422    
Special mention | Residential real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 39   39    
2022 3,470   3,470    
2021 994   994    
2020 1,355   1,355    
2019 534   534    
Prior 5,317   5,317    
Revolving 0   0    
Revolving to term 0   0    
Total Loans 11,709   11,709    
Special mention | Premium finance receivables - property and casualty          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 130,056   130,056    
2022 17,308   17,308    
2021 255   255    
2020 10   10    
2019 0   0    
Prior 0   0    
Revolving 0   0    
Revolving to term 0   0    
Total Loans 147,629   147,629    
Special mention | Premium finance receivables - life          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0    
2022 0   0    
2021 758   758    
2020 6,323   6,323    
2019 0   0    
Prior 29,157   29,157    
Revolving 0   0    
Revolving to term 0   0    
Total Loans 36,238   36,238    
Special mention | Consumer and other          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 2   2    
2022 13   13    
2021 0   0    
2020 0   0    
2019 2   2    
Prior 127   127    
Revolving 1   1    
Revolving to term 0   0    
Total Loans 145   145    
Substandard accrual          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 6,849   6,849    
2022 45,594   45,594    
2021 47,200   47,200    
2020 25,748   25,748    
2019 24,285   24,285    
Prior 133,262   133,262    
Revolving 61,731   61,731    
Revolving to term 510   510    
Total Loans 345,179   345,179    
Substandard accrual | Commercial, industrial and other          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 3,046   3,046    
2022 36,007   36,007    
2021 39,858   39,858    
2020 3,177   3,177    
2019 9,549   9,549    
Prior 41,282   41,282    
Revolving 60,683   60,683    
Revolving to term 382   382    
Total Loans 193,984   193,984    
Substandard accrual | Construction and development          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0    
2022 2,475   2,475    
2021 0   0    
2020 0   0    
2019 3,464   3,464    
Prior 13,416   13,416    
Revolving 0   0    
Revolving to term 0   0    
Total Loans 19,355   19,355    
Substandard accrual | Non-construction          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0    
2022 1,431   1,431    
2021 2,964   2,964    
2020 21,406   21,406    
2019 11,012   11,012    
Prior 68,530   68,530    
Revolving 0   0    
Revolving to term 0   0    
Total Loans 105,343   105,343    
Substandard accrual | Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0    
2022 0   0    
2021 0   0    
2020 0   0    
2019 0   0    
Prior 6,596   6,596    
Revolving 1,038   1,038    
Revolving to term 128   128    
Total Loans 7,762   7,762    
Substandard accrual | Residential real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 583   583    
2022 2,562   2,562    
2021 4,377   4,377    
2020 1,165   1,165    
2019 260   260    
Prior 3,401   3,401    
Revolving 0   0    
Revolving to term 0   0    
Total Loans 12,348   12,348    
Substandard accrual | Premium finance receivables - property and casualty          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 3,220   3,220    
2022 3,110   3,110    
2021 1   1    
2020 0   0    
2019 0   0    
Prior 0   0    
Revolving 0   0    
Revolving to term 0   0    
Total Loans 6,331   6,331    
Substandard accrual | Premium finance receivables - life          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0    
2022 0   0    
2021 0   0    
2020 0   0    
2019 0   0    
Prior 0   0    
Revolving 0   0    
Revolving to term 0   0    
Total Loans 0   0    
Substandard accrual | Consumer and other          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0    
2022 9   9    
2021 0   0    
2020 0   0    
2019 0   0    
Prior 37   37    
Revolving 10   10    
Revolving to term 0   0    
Total Loans 56   56    
Substandard nonaccrual/doubtful          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 4,554   4,554    
2022 21,019   21,019    
2021 7,101   7,101    
2020 10,960   10,960    
2019 30,556   30,556    
Prior 18,980   18,980    
Revolving 263   263    
Revolving to term 116   116    
Total Loans 93,549   93,549    
Substandard nonaccrual/doubtful | Commercial, industrial and other          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0    
2022 1,100   1,100    
2021 5,576   5,576    
2020 1,848   1,848    
2019 27,455   27,455    
Prior 4,316   4,316    
Revolving 165   165    
Revolving to term 0   0    
Total Loans 40,460   40,460    
Substandard nonaccrual/doubtful | Construction and development          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0    
2022 4,190   4,190    
2021 0   0    
2020 8,248   8,248    
2019 0   0    
Prior 98   98    
Revolving 0   0    
Revolving to term 0   0    
Total Loans 12,536   12,536    
Substandard nonaccrual/doubtful | Non-construction          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0    
2022 0   0    
2021 25   25    
2020 0   0    
2019 586   586    
Prior 5,336   5,336    
Revolving 0   0    
Revolving to term 0   0    
Total Loans 5,947   5,947    
Substandard nonaccrual/doubtful | Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0    
2022 0   0    
2021 77   77    
2020 115   115    
2019 18   18    
Prior 937   937    
Revolving 98   98    
Revolving to term 116   116    
Total Loans 1,361   1,361    
Substandard nonaccrual/doubtful | Residential real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0    
2022 912   912    
2021 1,206   1,206    
2020 744   744    
2019 2,497   2,497    
Prior 8,293   8,293    
Revolving 0   0    
Revolving to term 0   0    
Total Loans 13,652   13,652    
Substandard nonaccrual/doubtful | Premium finance receivables - property and casualty          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 4,554   4,554    
2022 14,811   14,811    
2021 213   213    
2020 5   5    
2019 0   0    
Prior 0   0    
Revolving 0   0    
Revolving to term 0   0    
Total Loans 19,583   19,583    
Substandard nonaccrual/doubtful | Premium finance receivables - life          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0    
2022 6   6    
2021 0   0    
2020 0   0    
2019 0   0    
Prior 0   0    
Revolving 0   0    
Revolving to term 0   0    
Total Loans 6   6    
Substandard nonaccrual/doubtful | Consumer and other          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0    
2022 0   0    
2021 4   4    
2020 0   0    
2019 0   0    
Prior 0   0    
Revolving 0   0    
Revolving to term 0   0    
Total Loans 4   4    
Early buy-out loans guaranteed by U.S. government agencies          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0    
2022 24   24    
2021 1,384   1,384    
2020 9,713   9,713    
2019 19,125   19,125    
Prior 157,602   157,602    
Revolving 0   0    
Revolving to term 0   0    
Total Loans 187,848   187,848    
Early buy-out loans guaranteed by U.S. government agencies | Residential real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0    
2022 24   24    
2021 1,384   1,384    
2020 9,713   9,713    
2019 19,125   19,125    
Prior 157,602   157,602    
Revolving 0   0    
Revolving to term 0   0    
Total Loans $ 187,848   $ 187,848