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Loans and Allowance for Credit Losses - Loan Classification by Risk Rating Category (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 $ 6,926,319  
2020 4,921,513  
2019 3,177,240  
2018 1,592,757  
2017 991,221  
Prior 1,390,440  
Revolving Loans 4,058,971  
Total 23,058,461 $ 22,424,501
Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 6,773,052  
2020 4,509,141  
2019 3,013,371  
2018 1,535,678  
2017 912,394  
Prior 1,332,430  
Revolving Loans 3,970,469  
Total 22,046,535  
Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 117,297  
2020 376,707  
2019 145,688  
2018 47,518  
2017 64,235  
Prior 36,197  
Revolving Loans 38,351  
Total 825,993  
Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 [1] 30,799  
2020 [1] 21,348  
2019 [1] 13,165  
2018 [1] 7,402  
2017 [1] 12,714  
Prior [1] 9,421  
Revolving Loans [1] 44,392  
Total [1] 139,241  
Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 5,171  
2020 14,317  
2019 5,016  
2018 2,159  
2017 1,878  
Prior 12,392  
Revolving Loans 5,759  
Total 46,692  
Doubtful-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0  
2020 0  
2019 0  
2018 0  
2017 0  
Prior 0  
Revolving Loans 0  
Total 0  
Commercial real estate - Owner occupied    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 717,350  
2020 779,973  
2019 425,656  
2018 360,155  
2017 245,192  
Prior 345,931  
Revolving Loans 80,262  
Total 2,954,519 2,802,227
Commercial real estate - Owner occupied | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 709,613  
2020 752,522  
2019 396,290  
2018 346,730  
2017 230,544  
Prior 338,358  
Revolving Loans 74,332  
Total 2,848,389  
Commercial real estate - Owner occupied | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 3,021  
2020 18,041  
2019 23,304  
2018 11,191  
2017 8,013  
Prior 5,408  
Revolving Loans 1,463  
Total 70,441  
Commercial real estate - Owner occupied | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 [1] 4,065  
2020 [1] 9,243  
2019 [1] 5,929  
2018 [1] 2,010  
2017 [1] 6,062  
Prior [1] 1,843  
Revolving Loans [1] 4,403  
Total [1] 33,555  
Commercial real estate - Owner occupied | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 651  
2020 167  
2019 133  
2018 224  
2017 573  
Prior 322  
Revolving Loans 64  
Total 2,134  
Commercial real estate - Owner occupied | Doubtful-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0  
2020 0  
2019 0  
2018 0  
2017 0  
Prior 0  
Revolving Loans 0  
Total 0  
Commercial real estate - Non-owner occupied    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,330,376  
2020 1,361,262  
2019 938,945  
2018 490,406  
2017 466,819  
Prior 560,222  
Revolving Loans 71,177  
Total 5,219,207 5,203,384
Commercial real estate - Non-owner occupied | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,224,463  
2020 1,011,088  
2019 878,712  
2018 458,453  
2017 409,687  
Prior 527,093  
Revolving Loans 71,142  
Total 4,580,638  
Commercial real estate - Non-owner occupied | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 102,390  
2020 339,589  
2019 58,766  
2018 28,326  
2017 55,434  
Prior 28,615  
Revolving Loans 35  
Total 613,155  
Commercial real estate - Non-owner occupied | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 [1] 3,523  
2020 [1] 10,582  
2019 [1] 1,372  
2018 [1] 2,992  
2017 [1] 1,698  
Prior [1] 3,346  
Revolving Loans [1] 0  
Total [1] 23,513  
Commercial real estate - Non-owner occupied | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0  
2020 3  
2019 95  
2018 635  
2017 0  
Prior 1,168  
Revolving Loans 0  
Total 1,901  
Commercial real estate - Non-owner occupied | Doubtful-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0  
2020 0  
2019 0  
2018 0  
2017 0  
Prior 0  
Revolving Loans 0  
Total 0  
Consumer real estate – mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 955,249  
2020 622,689  
2019 347,803  
2018 220,161  
2017 120,280  
Prior 322,335  
Revolving Loans 951,922  
Total 3,540,439 3,099,172
Consumer real estate – mortgage | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 954,840  
2020 621,396  
2019 344,081  
2018 218,698  
2017 118,796  
Prior 309,150  
Revolving Loans 946,762  
Total 3,513,723  
Consumer real estate – mortgage | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 120  
2020 0  
2019 0  
2018 697  
2017 64  
Prior 977  
Revolving Loans 0  
Total 1,858  
Consumer real estate – mortgage | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 [1] 0  
2020 [1] 881  
2019 [1] 0  
2018 [1] 0  
2017 [1] 449  
Prior [1] 1,834  
Revolving Loans [1] 2,886  
Total [1] 6,050  
Consumer real estate – mortgage | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 289  
2020 412  
2019 3,722  
2018 766  
2017 971  
Prior 10,374  
Revolving Loans 2,274  
Total 18,808  
Consumer real estate – mortgage | Doubtful-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0  
2020 0  
2019 0  
2018 0  
2017 0  
Prior 0  
Revolving Loans 0  
Total 0  
Construction and land development    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,151,241  
2020 987,068  
2019 719,998  
2018 180,268  
2017 26,433  
Prior 16,077  
Revolving Loans 15,876  
Total 3,096,961 2,901,746
Construction and land development | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,148,364  
2020 982,922  
2019 710,816  
2018 180,189  
2017 26,367  
Prior 15,867  
Revolving Loans 15,876  
Total 3,080,401  
Construction and land development | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 2,877  
2020 3,280  
2019 8,653  
2018 0  
2017 0  
Prior 0  
Revolving Loans 0  
Total 14,810  
Construction and land development | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 [1] 0  
2020 [1] 0  
2019 [1] 12  
2018 [1] 20  
2017 [1] 0  
Prior [1] 74  
Revolving Loans [1] 0  
Total [1] 106  
Construction and land development | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0  
2020 866  
2019 517  
2018 59  
2017 66  
Prior 136  
Revolving Loans 0  
Total 1,644  
Construction and land development | Doubtful-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0  
2020 0  
2019 0  
2018 0  
2017 0  
Prior 0  
Revolving Loans 0  
Total 0  
Commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 2,603,178  
2020 1,075,723  
2019 737,168  
2018 339,080  
2017 129,570  
Prior 143,816  
Revolving Loans 2,759,618  
Total 7,788,153 8,038,457
Commercial and industrial | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 2,566,847  
2020 1,046,415  
2019 675,802  
2018 328,921  
2017 124,091  
Prior 139,904  
Revolving Loans 2,682,244  
Total 7,564,224  
Commercial and industrial | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 8,889  
2020 15,797  
2019 54,965  
2018 7,304  
2017 724  
Prior 1,197  
Revolving Loans 36,853  
Total 125,729  
Commercial and industrial | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 [1] 23,211  
2020 [1] 642  
2019 [1] 5,852  
2018 [1] 2,380  
2017 [1] 4,505  
Prior [1] 2,324  
Revolving Loans [1] 37,103  
Total [1] 76,017  
Commercial and industrial | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 4,231  
2020 12,869  
2019 549  
2018 475  
2017 250  
Prior 391  
Revolving Loans 3,418  
Total 22,183  
Commercial and industrial | Doubtful-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0  
2020 0  
2019 0  
2018 0  
2017 0  
Prior 0  
Revolving Loans 0  
Total 0  
Consumer and other    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 168,925  
2020 94,798  
2019 7,670  
2018 2,687  
2017 2,927  
Prior 2,059  
Revolving Loans 180,116  
Total 459,182 $ 379,515
Consumer and other | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 168,925  
2020 94,798  
2019 7,670  
2018 2,687  
2017 2,909  
Prior 2,058  
Revolving Loans 180,113  
Total 459,160  
Consumer and other | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0  
2020 0  
2019 0  
2018 0  
2017 0  
Prior 0  
Revolving Loans 0  
Total 0  
Consumer and other | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 [1] 0  
2020 [1] 0  
2019 [1] 0  
2018 [1] 0  
2017 [1] 0  
Prior [1] 0  
Revolving Loans [1] 0  
Total [1] 0  
Consumer and other | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0  
2020 0  
2019 0  
2018 0  
2017 18  
Prior 1  
Revolving Loans 3  
Total 22  
Consumer and other | Doubtful-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0  
2020 0  
2019 0  
2018 0  
2017 0  
Prior 0  
Revolving Loans 0  
Total $ 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 troubled debt restructurings. Potential problem loans, which are not included in nonaccrual loans, amounted to approximately $139.2 million at September 30, 2021, compared to $173.5 million at December 31, 2020.