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Loans and Allowance for Credit Losses - Loan Classification by Risk Rating Category (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 $ 3,936,734   $ 3,936,734   $ 7,801,081
2023 5,794,430   5,794,430   8,956,751
2022 8,838,520   8,838,520   5,834,396
2021 5,454,557   5,454,557   2,057,226
2020 1,820,629   1,820,629   1,215,843
Prior 2,013,479   2,013,479   1,222,983
Revolving Loans 5,910,801   5,910,801   5,587,811
Total 33,769,150   33,769,150   32,676,091
Charged-off loans (28,802) $ (18,885) (49,634) $ (32,907)  
Potential problem loans 62,000   62,000   127,400
2023          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (8,729)    
2022          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (12,782)    
2021          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (9,005)    
2020          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (1,801)    
Prior          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (440)    
Revolving Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (15,796)    
2024          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (1,081)    
Pass          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 3,843,616   3,843,616   7,731,335
2023 5,688,299   5,688,299   8,844,015
2022 8,704,192   8,704,192   5,742,666
2021 5,363,934   5,363,934   2,038,952
2020 1,782,999   1,782,999   1,202,431
Prior 1,968,966   1,968,966   1,196,095
Revolving Loans 5,841,678   5,841,678   5,479,475
Total 33,193,684   33,193,684   32,234,969
Special Mention          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 65,454   65,454   15,448
2023 76,989   76,989   90,359
2022 117,045   117,045   17,757
2021 19,520   19,520   13,996
2020 34,635   34,635   5,666
Prior 20,107   20,107   11,883
Revolving Loans 49,890   49,890   45,025
Total 383,640   383,640   200,134
Substandard          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 25,066 [1]   25,066 [1]   41,393
2023 18,909 [1]   18,909 [1]   14,543
2022 2,307 [1]   2,307 [1]   28,573
2021 25,305 [1]   25,305 [1]   1,290
2020 100 [1]   100 [1]   2,122
Prior 9,905 [1]   9,905 [1]   9,793
Revolving Loans 12,585 [1]   12,585 [1]   60,986
Total 94,177 [1]   94,177 [1]   158,700
Substandard-nonaccrual          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 2,596   2,596   12,905
2023 10,233   10,233   7,834
2022 14,976   14,976   45,400
2021 45,798   45,798   2,987
2020 2,895   2,895   5,624
Prior 14,501   14,501   5,212
Revolving Loans 6,648   6,648   2,325
Total 97,647   97,647   82,287
Doubtful-nonaccrual          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 2   2   0
2023 0   0   0
2022 0   0   0
2021 0   0   1
2020 0   0   0
Prior 0   0   0
Revolving Loans 0   0   0
Total 2   2   1
Commercial real estate - owner occupied          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 387,246   387,246   794,738
2023 800,879   800,879   1,170,695
2022 1,134,749   1,134,749   880,637
2021 826,796   826,796   505,710
2020 481,066   481,066   273,469
Prior 518,432   518,432   362,967
Revolving Loans 68,183   68,183   56,680
Total 4,217,351   4,217,351   4,044,896
Charged-off loans (8,810) 0 (8,904) 0  
Commercial real estate - owner occupied | 2023          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (2,808)    
Commercial real estate - owner occupied | 2022          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (4,480)    
Commercial real estate - owner occupied | 2021          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (1,522)    
Commercial real estate - owner occupied | 2020          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     0    
Commercial real estate - owner occupied | Prior          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (94)    
Commercial real estate - owner occupied | Revolving Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     0    
Commercial real estate - owner occupied | 2024          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     0    
Commercial real estate - owner occupied | Pass          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 379,699   379,699   785,834
2023 792,938   792,938   1,123,425
2022 1,105,574   1,105,574   871,389
2021 817,200   817,200   502,260
2020 474,621   474,621   267,595
Prior 504,405   504,405   357,339
Revolving Loans 68,183   68,183   56,680
Total 4,142,620   4,142,620   3,964,522
Commercial real estate - owner occupied | Special Mention          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 7,203   7,203   1,595
2023 3,933   3,933   37,324
2022 28,213   28,213   5,300
2021 7,887   7,887   2,252
2020 5,302   5,302   5,306
Prior 12,614   12,614   4,701
Revolving Loans 0   0   0
Total 65,152   65,152   56,478
Commercial real estate - owner occupied | Substandard          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 0 [1]   0 [1]   5,528
2023 3,159 [1]   3,159 [1]   9,331
2022 962 [1]   962 [1]   3,262
2021 0 [1]   0 [1]   1,145
2020 83 [1]   83 [1]   568
Prior 769 [1]   769 [1]   610
Revolving Loans 0 [1]   0 [1]   0
Total 4,973 [1]   4,973 [1]   20,444
Commercial real estate - owner occupied | Substandard-nonaccrual          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 344   344   1,781
2023 849   849   615
2022 0   0   686
2021 1,709   1,709   53
2020 1,060   1,060   0
Prior 644   644   317
Revolving Loans 0   0   0
Total 4,606   4,606   3,452
Commercial real estate - owner occupied | Doubtful-nonaccrual          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 0   0   0
2023 0   0   0
2022 0   0   0
2021 0   0   0
2020 0   0   0
Prior 0   0   0
Revolving Loans 0   0   0
Total 0   0   0
Commercial real estate - non-owner occupied          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 674,526   674,526   1,329,832
2023 1,053,002   1,053,002   2,715,626
2022 3,008,996   3,008,996   1,777,455
2021 2,054,262   2,054,262   720,724
2020 602,721   602,721   507,178
Prior 688,201   688,201   376,317
Revolving Loans 102,476   102,476   108,362
Total 8,184,184   8,184,184   7,535,494
Charged-off loans (1,081) 0 (3,081) 0  
Commercial real estate - non-owner occupied | 2023          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     0    
Commercial real estate - non-owner occupied | 2022          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     0    
Commercial real estate - non-owner occupied | 2021          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (2,000)    
Commercial real estate - non-owner occupied | 2020          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     0    
Commercial real estate - non-owner occupied | Prior          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     0    
Commercial real estate - non-owner occupied | Revolving Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     0    
Commercial real estate - non-owner occupied | 2024          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (1,081)    
Commercial real estate - non-owner occupied | Pass          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 631,593   631,593   1,304,109
2023 1,039,519   1,039,519   2,682,275
2022 2,974,632   2,974,632   1,737,275
2021 2,015,973   2,015,973   713,979
2020 573,872   573,872   505,767
Prior 682,179   682,179   370,420
Revolving Loans 101,983   101,983   107,841
Total 8,019,751   8,019,751   7,421,666
Commercial real estate - non-owner occupied | Special Mention          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 39,971   39,971   0
2023 0   0   30,229
2022 34,240   34,240   0
2021 0   0   6,745
2020 28,849   28,849   216
Prior 5,477   5,477   5,335
Revolving Loans 0   0   0
Total 108,537   108,537   42,525
Commercial real estate - non-owner occupied | Substandard          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 2,962 [1]   2,962 [1]   25,723
2023 13,483 [1]   13,483 [1]   2,969
2022 0 [1]   0 [1]   0
2021 0 [1]   0 [1]   0
2020 0 [1]   0 [1]   1,195
Prior 72 [1]   72 [1]   73
Revolving Loans 0 [1]   0 [1]   0
Total 16,517 [1]   16,517 [1]   29,960
Commercial real estate - non-owner occupied | Substandard-nonaccrual          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 0   0   0
2023 0   0   153
2022 124   124   40,180
2021 38,289   38,289   0
2020 0   0   0
Prior 473   473   489
Revolving Loans 493   493   521
Total 39,379   39,379   41,343
Commercial real estate - non-owner occupied | Doubtful-nonaccrual          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 0   0   0
2023 0   0   0
2022 0   0   0
2021 0   0   0
2020 0   0   0
Prior 0   0   0
Revolving Loans 0   0   0
Total 0   0   0
Consumer real estate – mortgage          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 182,247   182,247   573,808
2023 539,209   539,209   978,271
2022 943,318   943,318   1,059,671
2021 1,018,630   1,018,630   450,945
2020 421,167   421,167   213,055
Prior 484,264   484,264   322,176
Revolving Loans 1,286,011   1,286,011   1,253,605
Total 4,874,846   4,874,846   4,851,531
Charged-off loans (39) (300) (662) (430)  
Consumer real estate – mortgage | 2023          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     0    
Consumer real estate – mortgage | 2022          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (90)    
Consumer real estate – mortgage | 2021          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (120)    
Consumer real estate – mortgage | 2020          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (42)    
Consumer real estate – mortgage | Prior          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (70)    
Consumer real estate – mortgage | Revolving Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (340)    
Consumer real estate – mortgage | 2024          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     0    
Consumer real estate – mortgage | Pass          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 182,185   182,185   573,120
2023 535,361   535,361   976,006
2022 934,265   934,265   1,056,720
2021 1,014,570   1,014,570   448,420
2020 419,459   419,459   207,790
Prior 471,990   471,990   318,505
Revolving Loans 1,281,288   1,281,288   1,253,091
Total 4,839,118   4,839,118   4,833,652
Consumer real estate – mortgage | Special Mention          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 0   0   0
2023 0   0   0
2022 0   0   0
2021 374   374   0
2020 0   0   0
Prior 0   0   0
Revolving Loans 0   0   0
Total 374   374   0
Consumer real estate – mortgage | Substandard          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 0 [1]   0 [1]   0
2023 0 [1]   0 [1]   0
2022 0 [1]   0 [1]   0
2021 0 [1]   0 [1]   0
2020 0 [1]   0 [1]   0
Prior 0 [1]   0 [1]   0
Revolving Loans 0 [1]   0 [1]   0
Total 0 [1]   0 [1]   0
Consumer real estate – mortgage | Substandard-nonaccrual          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 62   62   688
2023 3,848   3,848   2,265
2022 9,053   9,053   2,951
2021 3,686   3,686   2,525
2020 1,708   1,708   5,265
Prior 12,274   12,274   3,671
Revolving Loans 4,723   4,723   514
Total 35,354   35,354   17,879
Consumer real estate – mortgage | Doubtful-nonaccrual          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 0   0   0
2023 0   0   0
2022 0   0   0
2021 0   0   0
2020 0   0   0
Prior 0   0   0
Revolving Loans 0   0   0
Total 0   0   0
Construction and land development          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 607,823   607,823   1,155,865
2023 793,295   793,295   1,930,670
2022 1,694,760   1,694,760   884,060
2021 475,317   475,317   16,569
2020 9,562   9,562   5,580
Prior 7,786   7,786   6,451
Revolving Loans 33,020   33,020   41,886
Total 3,621,563   3,621,563   4,041,081
Charged-off loans 0 0 0 0  
Construction and land development | 2023          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     0    
Construction and land development | 2022          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     0    
Construction and land development | 2021          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     0    
Construction and land development | 2020          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     0    
Construction and land development | Prior          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     0    
Construction and land development | Revolving Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     0    
Construction and land development | 2024          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     0    
Construction and land development | Pass          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 607,112   607,112   1,153,137
2023 793,051   793,051   1,930,062
2022 1,693,842   1,693,842   884,060
2021 475,317   475,317   12,102
2020 9,549   9,549   5,580
Prior 7,786   7,786   6,369
Revolving Loans 33,020   33,020   41,886
Total 3,619,677   3,619,677   4,033,196
Construction and land development | Special Mention          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 711   711   2,728
2023 0   0   0
2022 323   323   0
2021 0   0   4,467
2020 0   0   0
Prior 0   0   0
Revolving Loans 0   0   0
Total 1,034   1,034   7,195
Construction and land development | Substandard          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 0 [1]   0 [1]   0
2023 0 [1]   0 [1]   0
2022 0 [1]   0 [1]   0
2021 0 [1]   0 [1]   0
2020 0 [1]   0 [1]   0
Prior 0 [1]   0 [1]   82
Revolving Loans 0 [1]   0 [1]   0
Total 0 [1]   0 [1]   82
Construction and land development | Substandard-nonaccrual          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 0   0   0
2023 244   244   608
2022 595   595   0
2021 0   0   0
2020 13   13   0
Prior 0   0   0
Revolving Loans 0   0   0
Total 852   852   608
Construction and land development | Doubtful-nonaccrual          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 0   0   0
2023 0   0   0
2022 0   0   0
2021 0   0   0
2020 0   0   0
Prior 0   0   0
Revolving Loans 0   0   0
Total 0   0   0
Commercial and industrial          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 1,959,876   1,959,876   3,810,029
2023 2,580,810   2,580,810   2,132,715
2022 2,033,518   2,033,518   1,166,447
2021 1,025,147   1,025,147   326,263
2020 275,333   275,333   216,020
Prior 313,965   313,965   154,416
Revolving Loans 4,139,973   4,139,973   3,860,801
Total 12,328,622   12,328,622   11,666,691
Charged-off loans (15,961) (14,179) (30,769) (24,828)  
Commercial and industrial | 2023          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (5,758)    
Commercial and industrial | 2022          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (8,144)    
Commercial and industrial | 2021          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (3,522)    
Commercial and industrial | 2020          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (692)    
Commercial and industrial | Prior          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (260)    
Commercial and industrial | Revolving Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (12,393)    
Commercial and industrial | 2024          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     0    
Commercial and industrial | Pass          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 1,918,409   1,918,409   3,778,326
2023 2,500,204   2,500,204   2,103,473
2022 1,972,714   1,972,714   1,127,096
2021 986,495   986,495   325,176
2020 274,748   274,748   215,158
Prior 301,777   301,777   142,806
Revolving Loans 4,076,131   4,076,131   3,753,575
Total 12,030,478   12,030,478   11,445,610
Commercial and industrial | Special Mention          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 17,569   17,569   11,125
2023 73,056   73,056   22,806
2022 54,269   54,269   12,457
2021 11,259   11,259   532
2020 484   484   144
Prior 2,016   2,016   1,847
Revolving Loans 49,890   49,890   45,025
Total 208,543   208,543   93,936
Commercial and industrial | Substandard          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 22,104 [1]   22,104 [1]   10,142
2023 2,267 [1]   2,267 [1]   2,243
2022 1,345 [1]   1,345 [1]   25,311
2021 25,305 [1]   25,305 [1]   145
2020 17 [1]   17 [1]   359
Prior 9,064 [1]   9,064 [1]   9,028
Revolving Loans 12,585 [1]   12,585 [1]   60,986
Total 72,687 [1]   72,687 [1]   108,214
Commercial and industrial | Substandard-nonaccrual          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 1,792   1,792   10,436
2023 5,283   5,283   4,193
2022 5,190   5,190   1,583
2021 2,088   2,088   409
2020 84   84   359
Prior 1,108   1,108   735
Revolving Loans 1,367   1,367   1,215
Total 16,912   16,912   18,930
Commercial and industrial | Doubtful-nonaccrual          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 2   2   0
2023 0   0   0
2022 0   0   0
2021 0   0   1
2020 0   0   0
Prior 0   0   0
Revolving Loans 0   0   0
Total 2   2   1
Consumer and other          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 125,016   125,016   136,809
2023 27,235   27,235   28,774
2022 23,179   23,179   66,126
2021 54,405   54,405   37,015
2020 30,780   30,780   541
Prior 831   831   656
Revolving Loans 281,138   281,138   266,477
Total 542,584   542,584   536,398
Charged-off loans (2,911) $ (4,406) (6,218) $ (7,649)  
Consumer and other | 2023          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (163)    
Consumer and other | 2022          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (68)    
Consumer and other | 2021          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (1,841)    
Consumer and other | 2020          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (1,067)    
Consumer and other | Prior          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (16)    
Consumer and other | Revolving Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     (3,063)    
Consumer and other | 2024          
Financing Receivable, Credit Quality Indicator [Line Items]          
Charged-off loans     0    
Consumer and other | Pass          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 124,618   124,618   136,809
2023 27,226   27,226   28,774
2022 23,165   23,165   66,126
2021 54,379   54,379   37,015
2020 30,750   30,750   541
Prior 829   829   656
Revolving Loans 281,073   281,073   266,402
Total 542,040   542,040   536,323
Consumer and other | Special Mention          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 0   0   0
2023 0   0   0
2022 0   0   0
2021 0   0   0
2020 0   0   0
Prior 0   0   0
Revolving Loans 0   0   0
Total 0   0   0
Consumer and other | Substandard          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 0 [1]   0 [1]   0
2023 0 [1]   0 [1]   0
2022 0 [1]   0 [1]   0
2021 0 [1]   0 [1]   0
2020 0 [1]   0 [1]   0
Prior 0 [1]   0 [1]   0
Revolving Loans 0 [1]   0 [1]   0
Total 0 [1]   0 [1]   0
Consumer and other | Substandard-nonaccrual          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 398   398   0
2023 9   9   0
2022 14   14   0
2021 26   26   0
2020 30   30   0
Prior 2   2   0
Revolving Loans 65   65   75
Total 544   544   75
Consumer and other | Doubtful-nonaccrual          
Financing Receivable, Credit Quality Indicator [Line Items]          
2024 0   0   0
2023 0   0   0
2022 0   0   0
2021 0   0   0
2020 0   0   0
Prior 0   0   0
Revolving Loans 0   0   0
Total $ 0   $ 0   $ 0
[1] Potential problem loans represent those loans with a well-defined weakness and where information about possible credit problems of borrowers has caused management to have doubts about the borrower's ability to comply with present repayment terms. This definition is believed to be substantially consistent with the standards established by Pinnacle Bank's primary regulators for loans classified as substandard, excluding loan modifications made to borrowers experiencing financial difficulty. Potential problem loans, which are not included in nonaccrual loans, amounted to approximately $62.0 million at June 30, 2024, compared to $127.4 million at December 31, 2023.