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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
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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.

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- Definition Represents performing loans which possess certain weaknesses that cause management to have serious doubts as to the ability of such borrowers to comply with the present loan repayment terms and which may result in the future disclosure of such loans as either nonaccrual, 90 days or more past due, or a troubled debt restructuring. + References No definition available. + Details
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