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Loans and Allowance for Credit Losses - Loan Classification by Risk Rating Category (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 $ 4,932,790  
2020 5,881,538  
2019 3,626,510  
2018 1,856,284  
2017 1,170,523  
Prior 1,673,661  
Revolving Loans 3,756,629  
Total 22,897,935 $ 22,424,501
Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 4,831,973  
2020 5,328,707  
2019 3,396,096  
2018 1,769,721  
2017 1,040,740  
Prior 1,533,022  
Revolving Loans 3,675,664  
Total 21,575,923  
Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 70,665  
2020 499,826  
2019 206,571  
2018 66,308  
2017 111,588  
Prior 110,943  
Revolving Loans 33,736  
Total 1,099,637  
Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 [1] 29,221  
2020 [1] 35,542  
2019 [1] 16,147  
2018 [1] 17,692  
2017 [1] 15,436  
Prior [1] 16,432  
Revolving Loans [1] 38,800  
Total [1] 169,270  
Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 931  
2020 17,463  
2019 7,696  
2018 2,563  
2017 2,759  
Prior 13,264  
Revolving Loans 8,429  
Total 53,105  
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 378,160  
2020 829,446  
2019 462,825  
2018 380,335  
2017 268,106  
Prior 420,559  
Revolving Loans 78,258  
Total 2,817,689 2,802,227
Commercial real estate - Owner occupied | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 372,905  
2020 795,798  
2019 431,840  
2018 361,214  
2017 247,024  
Prior 406,461  
Revolving Loans 72,504  
Total 2,687,746  
Commercial real estate - Owner occupied | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 3,691  
2020 19,290  
2019 23,524  
2018 15,127  
2017 9,778  
Prior 6,844  
Revolving Loans 1,350  
Total 79,604  
Commercial real estate - Owner occupied | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 [1] 1,564  
2020 [1] 14,187  
2019 [1] 7,322  
2018 [1] 3,217  
2017 [1] 10,268  
Prior [1] 6,874  
Revolving Loans [1] 4,404  
Total [1] 47,836  
Commercial real estate - Owner occupied | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0  
2020 171  
2019 139  
2018 777  
2017 1,036  
Prior 380  
Revolving Loans 0  
Total 2,503  
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 903,655  
2020 1,480,913  
2019 1,079,018  
2018 577,594  
2017 545,260  
Prior 713,298  
Revolving Loans 69,066  
Total 5,368,804 5,203,384
Commercial real estate - Non-owner occupied | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 840,396  
2020 1,036,343  
2019 965,640  
2018 526,914  
2017 443,070  
Prior 606,855  
Revolving Loans 69,031  
Total 4,488,249  
Commercial real estate - Non-owner occupied | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 58,047  
2020 436,107  
2019 111,495  
2018 47,077  
2017 100,497  
Prior 98,996  
Revolving Loans 35  
Total 852,254  
Commercial real estate - Non-owner occupied | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 [1] 5,212  
2020 [1] 8,460  
2019 [1] 1,603  
2018 [1] 3,044  
2017 [1] 1,693  
Prior [1] 5,578  
Revolving Loans [1] 0  
Total [1] 25,590  
Commercial real estate - Non-owner occupied | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0  
2020 3  
2019 280  
2018 559  
2017 0  
Prior 1,869  
Revolving Loans 0  
Total 2,711  
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 575,982  
2020 672,622  
2019 386,470  
2018 253,023  
2017 135,202  
Prior 358,014  
Revolving Loans 954,224  
Total 3,335,537 3,099,172
Consumer real estate – mortgage | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 575,556  
2020 671,443  
2019 383,987  
2018 251,640  
2017 133,519  
Prior 344,836  
Revolving Loans 950,101  
Total 3,311,082  
Consumer real estate – mortgage | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 120  
2020 0  
2019 58  
2018 705  
2017 517  
Prior 967  
Revolving Loans 0  
Total 2,367  
Consumer real estate – mortgage | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 [1] 0  
2020 [1] 1,000  
2019 [1] 0  
2018 [1] 0  
2017 [1] 0  
Prior [1] 1,854  
Revolving Loans [1] 1,760  
Total [1] 4,614  
Consumer real estate – mortgage | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 306  
2020 179  
2019 2,425  
2018 678  
2017 1,166  
Prior 10,357  
Revolving Loans 2,363  
Total 17,474  
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 619,512  
2020 1,078,442  
2019 812,200  
2018 221,647  
2017 28,166  
Prior 19,335  
Revolving Loans 12,309  
Total 2,791,611 2,901,746
Construction and land development | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 616,758  
2020 1,061,748  
2019 801,545  
2018 221,560  
2017 28,096  
Prior 17,426  
Revolving Loans 12,308  
Total 2,759,441  
Construction and land development | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 2,754  
2020 16,057  
2019 10,125  
2018 0  
2017 0  
Prior 1,788  
Revolving Loans 1  
Total 30,725  
Construction and land development | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 [1] 0  
2020 [1] 349  
2019 [1] 13  
2018 [1] 23  
2017 [1] 0  
Prior [1] 113  
Revolving Loans [1] 0  
Total [1] 498  
Construction and land development | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0  
2020 288  
2019 517  
2018 64  
2017 70  
Prior 8  
Revolving Loans 0  
Total 947  
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 2,323,655  
2020 1,714,851  
2019 876,057  
2018 420,071  
2017 189,647  
Prior 159,242  
Revolving Loans 2,460,647  
Total 8,144,170 8,038,457
Commercial and industrial | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 2,294,532  
2020 1,658,111  
2019 803,144  
2018 404,779  
2017 184,911  
Prior 154,233  
Revolving Loans 2,389,598  
Total 7,889,308  
Commercial and industrial | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 6,053  
2020 28,372  
2019 61,369  
2018 3,399  
2017 796  
Prior 2,348  
Revolving Loans 32,350  
Total 134,687  
Commercial and industrial | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 [1] 22,445  
2020 [1] 11,546  
2019 [1] 7,209  
2018 [1] 11,408  
2017 [1] 3,475  
Prior [1] 2,013  
Revolving Loans [1] 32,636  
Total [1] 90,732  
Commercial and industrial | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 625  
2020 16,822  
2019 4,335  
2018 485  
2017 465  
Prior 648  
Revolving Loans 6,063  
Total 29,443  
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 131,826  
2020 105,264  
2019 9,940  
2018 3,614  
2017 4,142  
Prior 3,213  
Revolving Loans 182,125  
Total 440,124 $ 379,515
Consumer and other | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 131,826  
2020 105,264  
2019 9,940  
2018 3,614  
2017 4,120  
Prior 3,211  
Revolving Loans 182,122  
Total 440,097  
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 22  
Prior 2  
Revolving Loans 3  
Total 27  
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 $169.3 million at June 30, 2021, compared to $173.5 million at December 31, 2020.