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Loans and Allowance for Credit Losses - Loan Classification by Risk Rating Category (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 $ 2,882,014    
2022 9,578,107    
2021 6,618,721    
2020 2,713,087    
2019 1,612,913    
Prior 1,761,994    
Revolving Loans 5,131,035    
Total 30,297,871   $ 29,041,605
Charged-off loans (14,022) $ (6,512)  
2023      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 0    
2022      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (4,319)    
2021      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (4,007)    
2020      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (842)    
2019      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (3)    
Prior      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (162)    
Revolving Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (4,689)    
Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 2,859,171    
2022 9,442,688    
2021 6,585,698    
2020 2,673,591    
2019 1,547,967    
Prior 1,733,487    
Revolving Loans 5,039,641    
Total 29,882,243    
Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 17,176    
2022 105,258    
2021 16,970    
2020 32,540    
2019 50,328    
Prior 17,916    
Revolving Loans 68,210    
Total 308,398    
Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 [1] 5,059    
2022 [1] 18,107    
2021 [1] 10,665    
2020 [1] 4,053    
2019 [1] 7,310    
Prior [1] 3,301    
Revolving Loans [1] 21,747    
Total [1] 70,242    
Substandard-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 605    
2022 12,054    
2021 5,388    
2020 2,903    
2019 7,308    
Prior 7,290    
Revolving Loans 1,437    
Total 36,985    
Doubtful-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 3    
2022 0    
2021 0    
2020 0    
2019 0    
Prior 0    
Revolving Loans 0    
Total 3    
Commercial real estate - Owner occupied      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 202,997    
2022 1,162,048    
2021 866,056    
2020 581,926    
2019 325,317    
Prior 486,861    
Revolving Loans 61,591    
Total 3,686,796   3,587,257
Charged-off loans 0 (86)  
Commercial real estate - Owner occupied | 2023      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 0    
Commercial real estate - Owner occupied | 2022      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 0    
Commercial real estate - Owner occupied | 2021      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 0    
Commercial real estate - Owner occupied | 2020      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 0    
Commercial real estate - Owner occupied | 2019      
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 0    
Commercial real estate - Owner occupied | Revolving Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 0    
Commercial real estate - Owner occupied | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 196,470    
2022 1,116,857    
2021 854,009    
2020 569,810    
2019 318,310    
Prior 476,339    
Revolving Loans 56,495    
Total 3,588,290    
Commercial real estate - Owner occupied | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 5,528    
2022 33,658    
2021 9,231    
2020 7,768    
2019 5,883    
Prior 7,547    
Revolving Loans 0    
Total 69,615    
Commercial real estate - Owner occupied | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 [1] 999    
2022 [1] 10,859    
2021 [1] 2,816    
2020 [1] 3,834    
2019 [1] 1,030    
Prior [1] 1,951    
Revolving Loans [1] 5,096    
Total [1] 26,585    
Commercial real estate - Owner occupied | Substandard-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 0    
2022 674    
2021 0    
2020 514    
2019 94    
Prior 1,024    
Revolving Loans 0    
Total 2,306    
Commercial real estate - Owner occupied | Doubtful-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 0    
2022 0    
2021 0    
2020 0    
2019 0    
Prior 0    
Revolving Loans 0    
Total 0    
Commercial real estate - Non-owner occupied      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 295,190    
2022 2,509,096    
2021 1,660,667    
2020 982,072    
2019 713,195    
Prior 630,013    
Revolving Loans 97,500    
Total 6,887,733   6,542,619
Charged-off loans 0 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 0    
Commercial real estate - Non-owner occupied | 2020      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 0    
Commercial real estate - Non-owner occupied | 2019      
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 | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 284,596    
2022 2,482,638    
2021 1,660,667    
2020 965,296    
2019 693,967    
Prior 623,402    
Revolving Loans 97,500    
Total 6,808,066    
Commercial real estate - Non-owner occupied | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 10,594    
2022 26,458    
2021 0    
2020 16,776    
2019 17,972    
Prior 5,011    
Revolving Loans 0    
Total 76,811    
Commercial real estate - Non-owner occupied | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 [1] 0    
2022 [1] 0    
2021 [1] 0    
2020 [1] 0    
2019 [1] 1,256    
Prior [1] 848    
Revolving Loans [1] 0    
Total [1] 2,104    
Commercial real estate - Non-owner occupied | Substandard-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 0    
2022 0    
2021 0    
2020 0    
2019 0    
Prior 752    
Revolving Loans 0    
Total 752    
Commercial real estate - Non-owner occupied | Doubtful-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 0    
2022 0    
2021 0    
2020 0    
2019 0    
Prior 0    
Revolving Loans 0    
Total 0    
Consumer real estate – mortgage      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 178,163    
2022 1,038,677    
2021 1,108,261    
2020 482,722    
2019 235,871    
Prior 371,933    
Revolving Loans 1,115,658    
Total 4,531,285   4,435,046
Charged-off loans (130) (162)  
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 0    
Consumer real estate – mortgage | 2021      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (32)    
Consumer real estate – mortgage | 2020      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 0    
Consumer real estate – mortgage | 2019      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 0    
Consumer real estate – mortgage | Prior      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 0    
Consumer real estate – mortgage | Revolving Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (98)    
Consumer real estate – mortgage | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 177,959    
2022 1,038,013    
2021 1,106,640    
2020 480,438    
2019 228,820    
Prior 366,864    
Revolving Loans 1,115,282    
Total 4,514,016    
Consumer real estate – mortgage | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 204    
2022 0    
2021 0    
2020 0    
2019 0    
Prior 158    
Revolving Loans 0    
Total 362    
Consumer real estate – mortgage | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 [1] 0    
2022 [1] 0    
2021 [1] 0    
2020 [1] 0    
2019 [1] 0    
Prior [1] 0    
Revolving Loans [1] 0    
Total [1] 0    
Consumer real estate – mortgage | Substandard-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 0    
2022 664    
2021 1,621    
2020 2,284    
2019 7,051    
Prior 4,911    
Revolving Loans 376    
Total 16,907    
Consumer real estate – mortgage | Doubtful-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 0    
2022 0    
2021 0    
2020 0    
2019 0    
Prior 0    
Revolving Loans 0    
Total 0    
Construction and land development      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 303,786    
2022 2,008,650    
2021 1,323,797    
2020 200,318    
2019 21,042    
Prior 10,586    
Revolving Loans 40,845    
Total 3,909,024   3,679,498
Charged-off loans 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 | 2019      
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 | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 303,786    
2022 1,998,380    
2021 1,320,902    
2020 200,318    
2019 21,042    
Prior 10,499    
Revolving Loans 40,845    
Total 3,895,772    
Construction and land development | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 0    
2022 10,270    
2021 2,765    
2020 0    
2019 0    
Prior 0    
Revolving Loans 0    
Total 13,035    
Construction and land development | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 [1] 0    
2022 [1] 0    
2021 [1] 0    
2020 [1] 0    
2019 [1] 0    
Prior [1] 87    
Revolving Loans [1] 0    
Total [1] 87    
Construction and land development | Substandard-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 0    
2022 0    
2021 130    
2020 0    
2019 0    
Prior 0    
Revolving Loans 0    
Total 130    
Construction and land development | Doubtful-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 0    
2022 0    
2021 0    
2020 0    
2019 0    
Prior 0    
Revolving Loans 0    
Total 0    
Commercial and industrial      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 1,783,128    
2022 2,810,570    
2021 1,565,865    
2020 416,205    
2019 316,007    
Prior 261,357    
Revolving Loans 3,570,195    
Total 10,723,327   10,241,362
Charged-off loans (10,649) (4,380)  
Commercial and industrial | 2023      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 0    
Commercial and industrial | 2022      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (4,176)    
Commercial and industrial | 2021      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (2,466)    
Commercial and industrial | 2020      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (210)    
Commercial and industrial | 2019      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 0    
Commercial and industrial | Prior      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (129)    
Commercial and industrial | Revolving Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (3,668)    
Commercial and industrial | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 1,777,610    
2022 2,757,756    
2021 1,549,405    
2020 407,926    
2019 284,347    
Prior 255,139    
Revolving Loans 3,484,273    
Total 10,516,456    
Commercial and industrial | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 850    
2022 34,872    
2021 4,974    
2020 7,996    
2019 26,473    
Prior 5,200    
Revolving Loans 68,210    
Total 148,575    
Commercial and industrial | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 [1] 4,060    
2022 [1] 7,248    
2021 [1] 7,849    
2020 [1] 219    
2019 [1] 5,024    
Prior [1] 415    
Revolving Loans [1] 16,651    
Total [1] 41,466    
Commercial and industrial | Substandard-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 605    
2022 10,694    
2021 3,637    
2020 64    
2019 163    
Prior 603    
Revolving Loans 1,061    
Total 16,827    
Commercial and industrial | Doubtful-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 3    
2022 0    
2021 0    
2020 0    
2019 0    
Prior 0    
Revolving Loans 0    
Total 3    
Consumer and other      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 118,750    
2022 49,066    
2021 94,075    
2020 49,844    
2019 1,481    
Prior 1,244    
Revolving Loans 245,246    
Total 559,706   $ 555,823
Charged-off loans (3,243) $ (1,884)  
Consumer and other | 2023      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans 0    
Consumer and other | 2022      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (143)    
Consumer and other | 2021      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (1,509)    
Consumer and other | 2020      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (632)    
Consumer and other | 2019      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (3)    
Consumer and other | Prior      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (33)    
Consumer and other | Revolving Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charged-off loans (923)    
Consumer and other | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 118,750    
2022 49,044    
2021 94,075    
2020 49,803    
2019 1,481    
Prior 1,244    
Revolving Loans 245,246    
Total 559,643    
Consumer and other | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 0    
2022 0    
2021 0    
2020 0    
2019 0    
Prior 0    
Revolving Loans 0    
Total 0    
Consumer and other | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 [1] 0    
2022 [1] 0    
2021 [1] 0    
2020 [1] 0    
2019 [1] 0    
Prior [1] 0    
Revolving Loans [1] 0    
Total [1] 0    
Consumer and other | Substandard-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 0    
2022 22    
2021 0    
2020 41    
2019 0    
Prior 0    
Revolving Loans 0    
Total 63    
Consumer and other | Doubtful-nonaccrual      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023 0    
2022 0    
2021 0    
2020 0    
2019 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 loan modifications made to borrowers experiencing financial difficulty. Potential problem loans, which are not included in nonaccrual loans, amounted to approximately $67.8 million at March 31, 2023, compared to $53.8 million at December 31, 2022.