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Loans and Allowance for Credit Losses - Loan Classification by Risk Rating Category (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 |  | $ 2,776,700 |
2020 |  | 7,314,277 |
2019 |  | 3,992,488 |
2018 |  | 2,215,245 |
2017 |  | 1,293,225 |
Prior |  | 1,964,579 |
Revolving Loans |  | 3,530,187 |
Total |  | 23,086,701 | $ 22,424,501
Potential problem loans not included in nonperforming assets |  | 160,800 | 173,500
Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 |  | 2,761,358 |
2020 |  | 6,643,781 |
2019 |  | 3,735,521 |
2018 |  | 2,115,454 |
2017 |  | 1,152,995 |
Prior |  | 1,808,130 |
Revolving Loans |  | 3,468,908 |
Total |  | 21,686,147 |
Special Mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 |  | 8,600 |
2020 |  | 593,082 |
2019 |  | 224,401 |
2018 |  | 72,300 |
2017 |  | 121,247 |
Prior |  | 117,274 |
Revolving Loans |  | 30,689 |
Total |  | 1,167,593 |
Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 | [1] | 5,463 |
2020 | [1] | 51,266 |
2019 | [1] | 23,536 |
2018 | [1] | 22,634 |
2017 | [1] | 16,366 |
Prior | [1] | 19,894 |
Revolving Loans | [1] | 21,667 |
Total | [1] | 160,826 |
Substandard-nonaccrual |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 |  | 1,279 |
2020 |  | 26,148 |
2019 |  | 9,030 |
2018 |  | 4,857 |
2017 |  | 2,617 |
Prior |  | 19,281 |
Revolving Loans |  | 8,923 |
Total |  | 72,135 |
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 |  | 186,342 |
2020 |  | 860,251 |
2019 |  | 484,369 |
2018 |  | 444,564 |
2017 |  | 310,594 |
Prior |  | 503,750 |
Revolving Loans |  | 79,915 |
Total |  | 2,869,785 | 2,802,227
Commercial real estate - Owner occupied | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 |  | 185,030 |
2020 |  | 818,913 |
2019 |  | 454,195 |
2018 |  | 415,769 |
2017 |  | 287,792 |
Prior |  | 482,233 |
Revolving Loans |  | 75,410 |
Total |  | 2,719,342 |
Commercial real estate - Owner occupied | Special Mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 |  | 843 |
2020 |  | 21,745 |
2019 |  | 23,153 |
2018 |  | 18,193 |
2017 |  | 9,943 |
Prior |  | 7,773 |
Revolving Loans |  | 100 |
Total |  | 81,750 |
Commercial real estate - Owner occupied | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 | [1] | 0 |
2020 | [1] | 15,418 |
2019 | [1] | 6,878 |
2018 | [1] | 7,720 |
2017 | [1] | 12,034 |
Prior | [1] | 9,215 |
Revolving Loans | [1] | 4,405 |
Total | [1] | 55,670 |
Commercial real estate - Owner occupied | Substandard-nonaccrual |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 |  | 469 |
2020 |  | 4,175 |
2019 |  | 143 |
2018 |  | 2,882 |
2017 |  | 825 |
Prior |  | 4,529 |
Revolving Loans |  | 0 |
Total |  | 13,023 |
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 |  | 371,805 |
2020 |  | 1,707,370 |
2019 |  | 1,278,098 |
2018 |  | 709,072 |
2017 |  | 566,825 |
Prior |  | 863,499 |
Revolving Loans |  | 76,512 |
Total |  | 5,573,181 | 5,203,384
Commercial real estate - Non-owner occupied | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 |  | 363,560 |
2020 |  | 1,195,970 |
2019 |  | 1,148,016 |
2018 |  | 655,692 |
2017 |  | 460,511 |
Prior |  | 753,838 |
Revolving Loans |  | 76,477 |
Total |  | 4,654,064 |
Commercial real estate - Non-owner occupied | Special Mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 |  | 4,790 |
2020 |  | 499,220 |
2019 |  | 128,032 |
2018 |  | 49,715 |
2017 |  | 104,627 |
Prior |  | 101,186 |
Revolving Loans |  | 35 |
Total |  | 887,605 |
Commercial real estate - Non-owner occupied | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 | [1] | 3,364 |
2020 | [1] | 12,177 |
2019 | [1] | 1,634 |
2018 | [1] | 3,092 |
2017 | [1] | 1,687 |
Prior | [1] | 6,099 |
Revolving Loans |  | 0 |
Total | [1] | 28,053 |
Commercial real estate - Non-owner occupied | Substandard-nonaccrual |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 |  | 91 |
2020 |  | 3 |
2019 |  | 416 |
2018 |  | 573 |
2017 |  | 0 |
Prior |  | 2,376 |
Revolving Loans |  | 0 |
Total |  | 3,459 |
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 |  | 208,214 |
2020 |  | 704,468 |
2019 |  | 436,261 |
2018 |  | 279,820 |
2017 |  | 147,980 |
Prior |  | 388,469 |
Revolving Loans |  | 921,704 |
Total |  | 3,086,916 | 3,099,172
Consumer real estate – mortgage | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 |  | 208,011 |
2020 |  | 703,564 |
2019 |  | 432,848 |
2018 |  | 278,303 |
2017 |  | 146,508 |
Prior |  | 374,293 |
Revolving Loans |  | 917,280 |
Total |  | 3,060,807 |
Consumer real estate – mortgage | Special Mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 |  | 121 |
2020 |  | 0 |
2019 |  | 0 |
2018 |  | 710 |
2017 |  | 66 |
Prior |  | 957 |
Revolving Loans |  | 0 |
Total |  | 1,854 |
Consumer real estate – mortgage | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 |  | 0 |
2020 | [1] | 661 |
2019 |  | 0 |
2018 | [1] | 0 |
2017 | [1] | 183 |
Prior | [1] | 1,872 |
Revolving Loans | [1] | 1,760 |
Total | [1] | 4,476 |
Consumer real estate – mortgage | Substandard-nonaccrual |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 |  | 82 |
2020 |  | 243 |
2019 |  | 3,413 |
2018 |  | 807 |
2017 |  | 1,223 |
Prior |  | 11,347 |
Revolving Loans |  | 2,664 |
Total |  | 19,779 |
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 |  | 232,072 |
2020 |  | 1,166,992 |
2019 |  | 826,244 |
2018 |  | 275,582 |
2017 |  | 32,215 |
Prior |  | 24,450 |
Revolving Loans |  | 11,414 |
Total |  | 2,568,969 | 2,901,746
Construction and land development | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 |  | 230,571 |
2020 |  | 1,127,479 |
2019 |  | 817,068 |
2018 |  | 275,489 |
2017 |  | 32,141 |
Prior |  | 19,315 |
Revolving Loans |  | 11,414 |
Total |  | 2,513,477 |
Construction and land development | Special Mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 |  | 1,501 |
2020 |  | 38,796 |
2019 |  | 8,638 |
2018 |  | 0 |
2017 |  | 0 |
Prior |  | 4,243 |
Revolving Loans |  | 0 |
Total |  | 53,178 |
Construction and land development | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 |  | 0 |
2020 | [1] | 354 |
2019 | [1] | 14 |
2018 | [1] | 25 |
2017 |  | 0 |
Prior | [1] | 363 |
Revolving Loans |  | 0 |
Total | [1] | 756 |
Construction and land development | Substandard-nonaccrual |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 |  | 0 |
2020 |  | 363 |
2019 |  | 524 |
2018 |  | 68 |
2017 |  | 74 |
Prior |  | 529 |
Revolving Loans |  | 0 |
Total |  | 1,558 |
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 |  | 1,685,064 |
2020 |  | 2,754,648 |
2019 |  | 953,621 |
2018 |  | 501,142 |
2017 |  | 230,133 |
Prior |  | 180,244 |
Revolving Loans |  | 2,271,676 |
Total |  | 8,576,528 | 8,038,457
Commercial and industrial | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 |  | 1,680,983 |
2020 |  | 2,677,307 |
2019 |  | 869,499 |
2018 |  | 485,136 |
2017 |  | 220,590 |
Prior |  | 174,287 |
Revolving Loans |  | 2,219,361 |
Total |  | 8,327,163 |
Commercial and industrial | Special Mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 |  | 1,345 |
2020 |  | 33,321 |
2019 |  | 64,578 |
2018 |  | 3,682 |
2017 |  | 6,611 |
Prior |  | 3,115 |
Revolving Loans |  | 30,554 |
Total |  | 143,206 |
Commercial and industrial | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 | [1] | 2,099 |
2020 | [1] | 22,656 |
2019 | [1] | 15,010 |
2018 | [1] | 11,797 |
2017 | [1] | 2,462 |
Prior | [1] | 2,345 |
Revolving Loans | [1] | 15,502 |
Total | [1] | 71,871 |
Commercial and industrial | Substandard-nonaccrual |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 |  | 637 |
2020 |  | 21,364 |
2019 |  | 4,534 |
2018 |  | 527 |
2017 |  | 470 |
Prior |  | 497 |
Revolving Loans |  | 6,259 |
Total |  | 34,288 |
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 |  | 93,203 |
2020 |  | 120,548 |
2019 |  | 13,895 |
2018 |  | 5,065 |
2017 |  | 5,478 |
Prior |  | 4,167 |
Revolving Loans |  | 168,966 |
Total |  | 411,322 | $ 379,515
Consumer and other | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2021 |  | 93,203 |
2020 |  | 120,548 |
2019 |  | 13,895 |
2018 |  | 5,065 |
2017 |  | 5,453 |
Prior |  | 4,164 |
Revolving Loans |  | 168,966 |
Total |  | 411,294 |
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 |  | 0 |
2020 |  | 0 |
2019 |  | 0 |
2018 |  | 0 |
2017 |  | 0 |
Prior |  | 0 |
Revolving Loans |  | 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 |  | 25 |
Prior |  | 3 |
Revolving Loans |  | 0 |
Total |  | 28 |
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 $160.8 million at March 31, 2021, compared to $173.5 million at December 31, 2020.

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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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