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Loans and Allowance for Credit Losses - Loan Classification by Risk Rating Category (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 $ 6,786,389  
2019 4,764,211  
2018 3,111,266  
2017 1,740,916  
2016 1,371,982  
Prior 1,327,309  
Revolving Loans 3,375,336  
Total 22,477,409 $ 19,787,876
Potential problem loans not included in nonperforming assets 215,700 276,000
Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 6,517,728  
2019 4,508,512  
2018 2,894,248  
2017 1,527,644  
2016 1,194,665  
Prior 1,160,118  
Revolving Loans 3,232,962  
Total 21,035,877 19,299,393
Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 197,051  
2019 219,176  
2018 182,887  
2017 179,456  
2016 161,092  
Prior 136,826  
Revolving Loans 77,953  
Total 1,154,441 148,267
Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 [1] 56,110  
2019 [1] 28,241  
2018 [1] 30,933  
2017 [1] 26,022  
2016 [1] 10,829  
Prior [1] 9,589  
Revolving Loans [1] 53,977  
Total [1] 215,701 278,611
Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 15,500  
2019 8,282  
2018 3,198  
2017 7,794  
2016 5,396  
Prior 20,776  
Revolving Loans 10,444  
Total 71,390 61,605
Doubtful-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 0  
Total 0 0
Commercial real estate – mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total   7,709,218
Commercial real estate – mortgage | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total   7,499,725
Commercial real estate – mortgage | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total   51,147
Commercial real estate – mortgage | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total [1]   139,518
Commercial real estate – mortgage | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total   18,828
Commercial real estate – mortgage | Doubtful-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total   0
Commercial real estate- owner occupied    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 540,102  
2019 491,765  
2018 529,891  
2017 378,021  
2016 383,048  
Prior 316,101  
Revolving Loans 109,147  
Total 2,748,075 2,669,766
Commercial real estate- owner occupied | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 514,127  
2019 473,410  
2018 497,269  
2017 347,792  
2016 368,441  
Prior 304,692  
Revolving Loans 79,208  
Total 2,584,939  
Commercial real estate- owner occupied | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 3,349  
2019 11,949  
2018 23,805  
2017 12,775  
2016 3,901  
Prior 5,698  
Revolving Loans 0  
Total 61,477  
Commercial real estate- owner occupied | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 [1] 21,725  
2019 [1] 6,251  
2018 [1] 7,828  
2017 [1] 15,991  
2016 [1] 8,986  
Prior [1] 2,119  
Revolving Loans [1] 28,134  
Total [1] 91,034  
Commercial real estate- owner occupied | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 901  
2019 155  
2018 989  
2017 1,463  
2016 1,720  
Prior 3,592  
Revolving Loans 1,805  
Total 10,625  
Commercial real estate- owner occupied | Doubtful-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 0  
Total 0  
Commercial real estate- Non-owner occupied    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,183,778  
2019 1,158,328  
2018 893,572  
2017 724,708  
2016 656,206  
Prior 538,524  
Revolving Loans 65,336  
Total 5,220,452 5,039,452
Commercial real estate- Non-owner occupied | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,011,392  
2019 1,035,694  
2018 765,605  
2017 560,797  
2016 509,620  
Prior 403,696  
Revolving Loans 54,308  
Total 4,341,112  
Commercial real estate- Non-owner occupied | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 165,690  
2019 120,702  
2018 121,523  
2017 157,652  
2016 144,731  
Prior 128,007  
Revolving Loans 11,028  
Total 849,333  
Commercial real estate- Non-owner occupied | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 6,696  
2019 [1] 1,495  
2018 [1] 5,699  
2017 [1] 6,120  
2016 [1] 1,015  
Prior [1] 2,972  
Revolving Loans 0  
Total [1] 23,997  
Commercial real estate- Non-owner occupied | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 437  
2018 745  
2017 139  
2016 840  
Prior 3,849  
Revolving Loans 0  
Total 6,010  
Commercial real estate- Non-owner occupied | Doubtful-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 0  
Total 0  
Consumer real estate – mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 462,723  
2019 543,986  
2018 376,295  
2017 186,690  
2016 145,282  
Prior 355,449  
Revolving Loans 970,594  
Total 3,041,019 3,068,625
Consumer real estate – mortgage | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 462,452  
2019 539,068  
2018 372,363  
2017 183,725  
2016 142,646  
Prior 341,108  
Revolving Loans 955,781  
Total 2,997,143 3,019,203
Consumer real estate – mortgage | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 102  
2019 2,695  
2018 2,929  
2017 644  
2016 0  
Prior 1,040  
Revolving Loans 8,739  
Total 16,149 13,787
Consumer real estate – mortgage | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 [1] 546  
2018 0  
2017 [1] 895  
2016 [1] 9  
Prior [1] 2,274  
Revolving Loans [1] 2,108  
Total [1] 5,832 10,969
Consumer real estate – mortgage | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 169  
2019 1,677  
2018 1,003  
2017 1,426  
2016 2,627  
Prior 11,027  
Revolving Loans 3,966  
Total 21,895 24,666
Consumer real estate – mortgage | Doubtful-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 0  
Total 0 0
Construction and land development    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 856,959  
2019 1,243,851  
2018 497,237  
2017 77,229  
2016 24,713  
Prior 12,592  
Revolving Loans 15,858  
Total 2,728,439 2,430,483
Construction and land development | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 849,025  
2019 1,209,363  
2018 471,069  
2017 77,146  
2016 20,229  
Prior 10,394  
Revolving Loans 15,858  
Total 2,653,084 2,422,347
Construction and land development | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 6,924  
2019 33,253  
2018 26,062  
2017 0  
2016 4,244  
Prior 0  
Revolving Loans 0  
Total 70,483 2,816
Construction and land development | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 [1] 619  
2019 [1] 681  
2018 [1] 29  
2017 0  
2016 [1] 240  
Prior [1] 150  
Revolving Loans 0  
Total [1] 1,719 3,042
Construction and land development | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 391  
2019 554  
2018 77  
2017 83  
2016 0  
Prior 2,048  
Revolving Loans 0  
Total 3,153 2,278
Construction and land development | Doubtful-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 0  
Total 0 0
Commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 3,629,020  
2019 1,302,307  
2018 806,087  
2017 365,882  
2016 158,086  
Prior 102,499  
Revolving Loans 2,032,082  
Total 8,395,963 6,290,296
Commercial and industrial | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 3,566,925  
2019 1,227,003  
2018 779,760  
2017 349,805  
2016 149,094  
Prior 98,086  
Revolving Loans 1,946,224  
Total 8,116,897 6,069,757
Commercial and industrial | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 20,986  
2019 50,577  
2018 8,568  
2017 8,385  
2016 8,216  
Prior 2,081  
Revolving Loans 58,186  
Total 156,999 79,819
Commercial and industrial | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 [1] 27,070  
2019 [1] 19,268  
2018 [1] 17,377  
2017 [1] 3,016  
2016 [1] 579  
Prior [1] 2,074  
Revolving Loans [1] 23,735  
Total [1] 93,119 125,035
Commercial and industrial | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 14,039  
2019 5,459  
2018 382  
2017 4,676  
2016 197  
Prior 258  
Revolving Loans 3,937  
Total 28,948 15,685
Commercial and industrial | Doubtful-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 0  
Total 0 0
Consumer and other    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 113,807  
2019 23,974  
2018 8,184  
2017 8,386  
2016 4,647  
Prior 2,144  
Revolving Loans 182,319  
Total 343,461 289,254
Consumer and other | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 113,807  
2019 23,974  
2018 8,182  
2017 8,379  
2016 4,635  
Prior 2,142  
Revolving Loans 181,583  
Total 342,702 288,361
Consumer and other | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 0  
Total 0 698
Consumer and other | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 0  
Total [1] 0 47
Consumer and other | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 2  
2017 7  
2016 12  
Prior 2  
Revolving Loans 736  
Total 759 148
Consumer and other | Doubtful-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 0  
Total $ 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 troubled debt restructurings. Potential problem loans, which are not included in nonaccrual loans, amounted to approximately $215.7 million at September 30, 2020, compared to $276.0 million at December 31, 2019.