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Loans and Allowance for Credit Losses - Loan Classification by Risk Rating Category (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 $ 5,457,922  
2019 5,173,784  
2018 3,389,730  
2017 2,010,368  
2016 1,526,501  
Prior 1,519,113  
Revolving Loans 3,442,882  
Total 22,520,300 $ 19,787,876
Potential problem loans not included in nonperforming assets 251,300 276,000
Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 5,353,014  
2019 4,836,259  
2018 3,173,088  
2017 1,787,312  
2016 1,313,247  
Prior 1,339,895  
Revolving Loans 3,321,842  
Total 21,124,657 19,299,393
Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 67,607  
2019 268,003  
2018 184,812  
2017 192,162  
2016 192,303  
Prior 144,894  
Revolving Loans 31,264  
Total 1,081,045 148,267
Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 [1] 32,773  
2019 [1] 57,188  
2018 [1] 27,212  
2017 [1] 25,690  
2016 [1] 14,991  
Prior [1] 11,747  
Revolving Loans [1] 82,436  
Total [1] 252,037 278,611
Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 4,528  
2019 12,334  
2018 4,618  
2017 5,204  
2016 5,960  
Prior 22,577  
Revolving Loans 7,340  
Total 62,561 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 363,722  
2019 501,417  
2018 542,042  
2017 421,508  
2016 409,227  
Prior 361,167  
Revolving Loans 109,223  
Total 2,708,306 2,669,766
Commercial real estate- owner occupied | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 342,164  
2019 485,461  
2018 509,788  
2017 388,684  
2016 389,384  
Prior 347,423  
Revolving Loans 64,075  
Total 2,526,979  
Commercial real estate- owner occupied | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 2,445  
2019 8,612  
2018 23,239  
2017 11,957  
2016 5,563  
Prior 5,775  
Revolving Loans 0  
Total 57,591  
Commercial real estate- owner occupied | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 [1] 18,292  
2019 [1] 6,902  
2018 [1] 6,877  
2017 [1] 18,256  
2016 [1] 12,685  
Prior [1] 3,880  
Revolving Loans [1] 45,038  
Total [1] 111,930  
Commercial real estate- owner occupied | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 821  
2019 442  
2018 2,138  
2017 2,611  
2016 1,595  
Prior 4,089  
Revolving Loans 110  
Total 11,806  
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 851,725  
2019 1,330,033  
2018 968,415  
2017 791,062  
2016 751,286  
Prior 619,939  
Revolving Loans 71,558  
Total 5,384,018 5,039,452
Commercial real estate- Non-owner occupied | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 798,839  
2019 1,154,829  
2018 867,521  
2017 623,990  
2016 574,543  
Prior 476,052  
Revolving Loans 71,274  
Total 4,567,048  
Commercial real estate- Non-owner occupied | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 46,818  
2019 170,003  
2018 95,155  
2017 163,384  
2016 174,600  
Prior 136,136  
Revolving Loans 284  
Total 786,380  
Commercial real estate- Non-owner occupied | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 6,068  
2019 [1] 1,484  
2018 [1] 4,976  
2017 [1] 3,541  
2016 [1] 1,072  
Prior [1] 2,995  
Revolving Loans 0  
Total [1] 20,136  
Commercial real estate- Non-owner occupied | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 3,717  
2018 763  
2017 147  
2016 1,071  
Prior 4,756  
Revolving Loans 0  
Total 10,454  
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 278,911  
2019 595,596  
2018 413,732  
2017 203,627  
2016 160,113  
Prior 402,339  
Revolving Loans 988,286  
Total 3,042,604 3,068,625
Consumer real estate – mortgage | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 276,995  
2019 590,211  
2018 409,497  
2017 200,643  
2016 156,708  
Prior 387,684  
Revolving Loans 974,695  
Total 2,996,433 3,019,203
Consumer real estate – mortgage | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 493  
2019 2,697  
2018 3,314  
2017 645  
2016 0  
Prior 1,025  
Revolving Loans 8,739  
Total 16,913 13,787
Consumer real estate – mortgage | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 [1] 932  
2019 [1] 1,200  
2018 0  
2017 [1] 900  
2016 [1] 378  
Prior [1] 2,141  
Revolving Loans [1] 470  
Total [1] 6,021 10,969
Consumer real estate – mortgage | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 491  
2019 1,488  
2018 921  
2017 1,439  
2016 3,027  
Prior 11,489  
Revolving Loans 4,382  
Total 23,237 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 602,271  
2019 1,249,888  
2018 534,984  
2017 127,063  
2016 24,858  
Prior 13,642  
Revolving Loans 21,788  
Total 2,574,494 2,430,483
Construction and land development | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 594,375  
2019 1,216,171  
2018 487,354  
2017 126,976  
2016 20,375  
Prior 11,501  
Revolving Loans 21,788  
Total 2,478,540 2,422,347
Construction and land development | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 6,750  
2019 32,465  
2018 47,324  
2017 0  
2016 4,243  
Prior 0  
Revolving Loans 0  
Total 90,782 2,816
Construction and land development | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 [1] 824  
2019 [1] 687  
2018 [1] 31  
2017 0  
2016 [1] 240  
Prior [1] 160  
Revolving Loans 0  
Total [1] 1,942 3,042
Construction and land development | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 322  
2019 565  
2018 275  
2017 87  
2016 0  
Prior 1,981  
Revolving Loans 0  
Total 3,230 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 3,314,115  
2019 1,467,167  
2018 920,814  
2017 456,612  
2016 174,930  
Prior 119,061  
Revolving Loans 2,063,634  
Total 8,516,333 6,290,296
Commercial and industrial | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 3,293,463  
2019 1,359,904  
2018 889,189  
2017 436,566  
2016 166,155  
Prior 114,273  
Revolving Loans 2,001,673  
Total 8,261,223 6,069,757
Commercial and industrial | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 11,101  
2019 54,226  
2018 15,780  
2017 16,176  
2016 7,897  
Prior 1,958  
Revolving Loans 22,232  
Total 129,370 79,819
Commercial and industrial | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 [1] 6,657  
2019 [1] 46,915  
2018 [1] 15,328  
2017 [1] 2,993  
2016 [1] 616  
Prior [1] 2,571  
Revolving Loans [1] 36,881  
Total [1] 111,961 125,035
Commercial and industrial | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 2,894  
2019 6,122  
2018 517  
2017 877  
2016 262  
Prior 259  
Revolving Loans 2,848  
Total 13,779 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 47,178  
2019 29,683  
2018 9,743  
2017 10,496  
2016 6,087  
Prior 2,965  
Revolving Loans 188,393  
Total 294,545 289,254
Consumer and other | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 47,178  
2019 29,683  
2018 9,739  
2017 10,453  
2016 6,082  
Prior 2,962  
Revolving Loans 188,337  
Total 294,434 288,361
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 9  
Total 9 698
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 [1] 47  
Total [1] 47 47
Consumer and other | Substandard-nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 4  
2017 43  
2016 5  
Prior 3  
Revolving Loans 0  
Total 55 148
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 $251.3 million at June 30, 2020, compared to $276.0 million at December 31, 2019.